KR101917656B1 - Method and apparatus for video encoding considering order of skip and split, and method and apparatus for video decoding considering order of skip and split - Google Patents

Abstract

The picture is divided into coding units of a predetermined maximum size and the coding is performed based on the coding units for each depth for each of the maximum coding units and for each of the reduced areas in which the maximum coding units are divided stepwise as the depths become deeper, And the encoding mode of the encoding unit of the encoding depth including the skip mode information and the division information arranged according to the order of the division information selectively determined for each depth encoding unit A video encoding method for outputting information and encoded video data is disclosed.

Description

TECHNICAL FIELD The present invention relates to a video coding method, a video coding method, a video decoding method, and a video decoding method,

The present invention relates to encoding and decoding of video.

Background of the Invention [0002] With the development and dissemination of hardware capable of reproducing and storing high-resolution or high-definition video content, there is a growing need for a video codec that effectively encodes or decodes high-definition or high-definition video content. According to the conventional video codec, video is encoded according to a limited encoding method based on a macroblock of a predetermined size.

The present invention relates to video coding and decoding in which the order of skipping and division of coding units is considered according to the characteristics of data units.

According to an embodiment of the present invention, there is provided a video coding method considering a skip and a dividing order, the method comprising: dividing a picture into coding units of a predetermined maximum size; For each maximum coding unit, as the depth is deepened, the maximum coding unit is divided stepwise to perform coding based on the coding unit for each depth for each reduced area, and the coding depth to which the coding result is output and the coding depth Determining an encoding mode for the unit; And information indicating an order of skip mode information and division information selectively determined for each depth encoding unit, information on an encoding mode of an encoding unit of the encoding depth including the skip mode information and the division information, And outputting the encoded video data for each of the maximum encoding units.

An encoding unit according to an embodiment may be characterized by a maximum size and a depth. Depth indicates a stage in which coding units are hierarchically divided. As the depth increases, the depth coding units can be divided from the maximum coding unit to the minimum coding unit. The depth of the maximum encoding unit is the highest depth and the minimum encoding unit can be defined as the least significant encoding unit. As the depth of the maximum encoding unit increases, the size of the depth-dependent encoding unit decreases, so that the encoding unit of the higher depth may include a plurality of lower-depth encoding units.

As described above, according to the maximum size of an encoding unit, the image data of the current picture is divided into a maximum encoding unit, and each maximum encoding unit may include encoding units divided by depth. Since the maximum encoding unit according to an embodiment is divided by depth, image data of a spatial domain included in the maximum encoding unit can be hierarchically classified according to depth.

The maximum depth for limiting the total number of times the height and width of the maximum encoding unit can be hierarchically divided and the maximum size of the encoding unit may be preset.

The order of the skip mode information and the division information selectively determined for each depth coding unit according to an exemplary embodiment may be one of an image sequence to which the depth coding unit belongs, a slice type, a slice type according to the prediction direction, May be determined according to at least one.

The order of the skip mode information and the division information selectively determined for each depth encoding unit according to an exemplary embodiment may be determined according to the depth of the depth encoding unit in the maximum encoding unit.

The order of the skip mode information and the division information of the depth encoding unit according to an exemplary embodiment is such that when the depth encoding unit is the maximum encoding unit, the skip mode information precedes the division information, If the unit is not the maximum encoding unit, the division information may be determined to precede the skip mode information.

According to an embodiment of the present invention, there is provided a video decoding method considering a skip and a dividing order, comprising: receiving and parsing a bitstream of encoded video; Extracting skip mode information of the depth encoding unit and information on the order of the segmentation information from the bitstream and extracting information on the order of the skip mode information and the segmentation information from the bitstream to the encoding depth and encoding mode And extracting encoded video data; And decoding the encoded video data for each of the encoding units of at least one encoding depth for each maximum encoding unit of the encoded video data based on the information on the encoding depth and encoding mode.

The extraction step according to an exemplary embodiment may further include determining whether to predict a skip mode according to the skip mode information according to the order of the skip mode information and the division information when the depth encoding unit is the maximum encoding unit, Determining whether or not the division according to the division information precedes the prediction of the skip mode according to the skip mode information if the coding unit per depth is not the maximum coding unit, The information on the coding depth of the coding unit and the coding mode of the coding depth and the video data coded by the coding unit of the coding depth can be extracted.

The extracting step according to an exemplary embodiment may include a step of extracting one skip mode information and a skip information skip information which are obtained by merging the skip mode information and the split information with respect to each depth encoding unit, , And when the skip mode information or the division information is extracted for the depth encoding unit, it may not be divided for the depth encoding unit or may not be predicted in the skip mode.

A video coding apparatus considering a skip and a dividing order according to an embodiment of the present invention includes: a maximum coding unit division unit for dividing a picture into coding units of a predetermined maximum size; For each maximum coding unit, as the depth is deepened, the maximum coding unit is divided stepwise to perform coding based on the coding unit for each depth for each reduced area, and the coding depth to which the coding result is output and the coding depth An encoding depth and encoding mode determining unit for determining an encoding mode for a unit; And information indicating an order of skip mode information and division information selectively determined for each depth encoding unit, information on an encoding mode of an encoding unit of the encoding depth including the skip mode information and the division information, And an output unit for outputting the encoded video data for each of the maximum encoding units.

A video decoding apparatus considering a skip and a dividing order according to an embodiment of the present invention includes: a receiving unit for receiving and parsing a bitstream of encoded video; Extracting skip mode information of the depth encoding unit and information on the order of the segmentation information from the bitstream and extracting information on the order of the skip mode information and the segmentation information from the bitstream into the encoding depth and encoding mode A data extracting unit for extracting encoded video data and information on the encoded video data; And a decoding unit for decoding the video data encoded for each of the encoding units of at least one encoding depth for each of the maximum encoding units of the encoded video data based on the information on the encoding depth and encoding mode.

The present invention includes a computer-readable recording medium on which a program for implementing a video coding method considering skip and division order is recorded according to an embodiment. According to an embodiment of the present invention, there is also provided a computer-readable recording medium on which a program for implementing a video decoding method considering skip and skip order is recorded.

1 shows a block diagram of a video encoding apparatus according to an embodiment of the present invention.
2 shows a block diagram of a video decoding apparatus according to an embodiment of the present invention.
FIG. 3 illustrates a concept of an encoding unit according to an embodiment of the present invention.
4 is a block diagram of an image encoding unit based on an encoding unit according to an embodiment of the present invention.
5 is a block diagram of an image decoding unit based on an encoding unit according to an embodiment of the present invention.
FIG. 6 illustrates a depth-based coding unit and a prediction unit according to an embodiment of the present invention.
FIG. 7 shows a relationship between an encoding unit and a conversion unit according to an embodiment of the present invention.
FIG. 8 illustrates depth-specific encoding information, in accordance with an embodiment of the present invention.
FIG. 9 shows a depth encoding unit according to an embodiment of the present invention.
FIGS. 10A and 10B show a relationship between an encoding unit, a prediction unit, and a frequency conversion unit according to an embodiment of the present invention.
FIG. 11 shows encoding information for each encoding unit according to an embodiment of the present invention.
12 shows a flowchart of a video coding method according to an embodiment of the present invention.
13 shows a flowchart of a video decoding method according to an embodiment of the present invention.
FIG. 14 shows a video encoding apparatus considering skip and division order according to an embodiment of the present invention.
15 shows a video decoding apparatus considering skip and division order according to an embodiment of the present invention.
FIG. 16 shows encoding units for each encoding depth of a maximum encoding unit according to an embodiment of the present invention.
17 illustrates a video coding method considering skip and division order according to an embodiment of the present invention.
18 shows a video decoding method considering a skip and a dividing order according to an embodiment of the present invention.

Hereinafter, a video encoding apparatus and a video decoding apparatus, a video encoding method, and a video decoding method according to an embodiment of the present invention will be described with reference to FIG. 1 to FIG. Referring to FIGS. 1 to 13, encoding of video and decoding of video based on spatially hierarchical data units according to an embodiment of the present invention will be described below and referring to FIGS. 14 to 18, The coding of the video and the decoding of the video in consideration of the skipping and dividing order will be described later.

Hereinafter, a video encoding apparatus, a video encoding apparatus, a video encoding method, and a video decoding method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 13.

1 shows a block diagram of a video encoding apparatus according to an embodiment of the present invention.

The video coding apparatus 100 according to an embodiment includes a maximum coding unit division unit 110, a coding depth determination unit 120, and an output unit 130.

The maximum coding unit division unit 110 may divide a current picture based on a maximum coding unit which is a coding unit of a maximum size for a current picture of an image. If the current picture is larger than the maximum encoding unit, the image data of the current picture may be divided into at least one maximum encoding unit. The image data may be output to the coding depth determination unit 120 for each of at least one maximum coding unit.

An encoding unit according to an embodiment may be characterized by a maximum size and a depth. Depth indicates a stage in which coding units are hierarchically divided. As the depth increases, the depth coding units can be divided from the maximum coding unit to the minimum coding unit. The depth of the maximum encoding unit is the highest depth and the minimum encoding unit can be defined as the least significant encoding unit. As the depth of the maximum encoding unit increases, the size of the depth-dependent encoding unit decreases, so that the encoding unit of the higher depth may include a plurality of lower-depth encoding units.

As described above, according to the maximum size of an encoding unit, the image data of the current picture is divided into a maximum encoding unit, and each maximum encoding unit may include encoding units divided by depth. Since the maximum encoding unit according to an embodiment is divided by depth, image data of a spatial domain included in the maximum encoding unit can be hierarchically classified according to depth.

The maximum depth for limiting the total number of times the height and width of the maximum encoding unit can be hierarchically divided and the maximum size of the encoding unit may be preset.

The coding depth determiner 120 encodes at least one divided area in which the area of the maximum coding unit is divided for each depth, and determines the depth at which the final coding result is output for each of at least one of the divided areas. That is, the coding depth determination unit 120 selects the depth at which the smallest coding error occurs, and determines the coding depth as the coding depth by coding the image data in units of depth coding for each maximum coding unit of the current picture. The determined coding depth and the image data of each coding unit are output to the output unit 130.

The image data in the maximum encoding unit is encoded based on the depth encoding unit according to at least one depth below the maximum depth, and the encoding results based on the respective depth encoding units are compared. As a result of the comparison of the encoding error of the depth-dependent encoding unit, the depth with the smallest encoding error can be selected. At least one coding depth may be determined for each maximum coding unit.

As the depth of the maximum encoding unit increases, the encoding unit is hierarchically divided and divided, and the number of encoding units increases. In addition, even if encoding units of the same depth included in one maximum encoding unit, the encoding error of each data is measured and it is determined whether or not the encoding unit is divided into lower depths. Therefore, even if the data included in one maximum coding unit has a different coding error according to the position, the coding depth can be determined depending on the position. Accordingly, one or more coding depths may be set for one maximum coding unit, and data of the maximum coding unit may be divided according to one or more coding depth encoding units.

The predictive encoding and frequency conversion of the maximum encoding unit can be performed. Likewise, predictive coding and frequency conversion are performed on the basis of the depth coding unit for each maximum coding unit and for each depth below the maximum depth.

Since the number of coding units per depth is increased every time the maximum coding unit is divided by the depth, the coding including the predictive coding and the frequency conversion should be performed for every depth coding unit as the depth increases. For convenience of explanation, predictive coding and frequency conversion will be described based on a coding unit of a current depth among at least one maximum coding unit.

The video encoding apparatus 100 according to an exemplary embodiment may select various sizes or types of data units for encoding image data. To encode the image data, a layer such as predictive encoding, frequency conversion, and entropy encoding is used. The same data unit may be used for all steps, and the data unit may be changed step by step.

For example, the video coding apparatus 100 can select not only a coding unit for coding image data but also a data unit different from the coding unit in order to perform predictive coding of the image data of the coding unit.

For predictive coding of the maximum coding unit, predictive coding may be performed based on the partial data unit of the coding unit for each depth of the maximum coding unit. The partial data unit of the encoding unit may include a data unit in which at least one of the height and the width of the encoding unit and the depth encoding unit is divided.

For example, when the size of the encoding unit is 2Nx2N (where N is a positive integer), the size of the partial data unit may be 2Nx2N, 2NxN, Nx2N, NxN, and the like. Prediction coding may be performed based on data units of various types, in addition to data units of a type in which at least one of the height and the width of an encoding unit is divided by half. Hereinafter, a data unit on which prediction encoding is based may be referred to as a 'prediction unit'.

The prediction mode of the encoding unit may be at least one of an intra mode, an inter mode, and a skip mode. For example, the intra mode and the inter mode can be performed for prediction units of 2Nx2N, 2NxN, Nx2N, and NxN sizes. In addition, the skip mode can be performed only for a prediction unit of 2Nx2N size. Encoding is performed independently for each prediction unit within an encoding unit, and a prediction mode having the smallest encoding error can be selected.

In addition, the video encoding apparatus 100 according to an exemplary embodiment may perform frequency conversion of image data of an encoding unit based on not only an encoding unit for encoding image data but also a data unit different from the encoding unit.

For frequency conversion of a coding unit, frequency conversion may be performed based on a data unit having a size smaller than or equal to the coding unit. For example, a data unit for frequency conversion may include a data unit for intra mode and a data unit for inter mode. Hereinafter, the data unit on which the frequency conversion is based may be referred to as a 'conversion unit'.

The coding information according to the coding depth needs not only the coding depth but also prediction related information and frequency conversion related information. Therefore, the coding depth determiner 120 not only determines the coding depth at which the minimum coding error is generated, but also the partition type in which the coding unit of the coding depth is divided into prediction units, the prediction unit-specific prediction mode, Can be determined.

The coding depth determination unit 120 may measure the coding error of the depth-dependent coding unit using a Lagrangian Multiplier-based rate-distortion optimization technique.

The output unit 130 outputs, in the form of a bit stream, video data of the maximum encoding unit encoded based on at least one encoding depth determined by the encoding depth determination unit 120 and information on the depth encoding mode.

The encoded video data may be a result of encoding residual data of the video.

The information on the depth-dependent coding mode may include coding depth information, partition type information of a prediction unit of a coding unit of coding depth, prediction mode information per prediction unit, size information of a conversion unit, and the like.

The coding depth information can be defined using depth division information indicating whether or not coding is performed at the lower depth coding unit without coding at the current depth. If the current depth of the current encoding unit is the encoding depth, the current encoding unit is encoded in the current depth encoding unit, so that the division information of the current depth can be defined so as not to be further divided into lower depths. On the other hand, if the current depth of the current encoding unit is not the encoding depth, the encoding using the lower depth encoding unit should be tried. Therefore, the division information of the current depth may be defined to be divided into the lower depth encoding units.

If the current depth is not the encoding depth, encoding is performed on the encoding unit divided into lower-depth encoding units. Since there are one or more lower-level coding units in the current-depth coding unit, the coding is repeatedly performed for each lower-level coding unit so that recursive coding can be performed for each coding unit of the same depth.

At least one coding depth is determined in one maximum coding unit and at least one coding mode information is determined for each coding depth so that information on at least one coding mode can be determined for one maximum coding unit. Since the data of the maximum encoding unit is hierarchically divided according to the depth and the depth of encoding may be different for each position, information on the encoding depth and the encoding mode may be set for the data.

Accordingly, the output unit 130 according to the embodiment can set the corresponding encoding information for each minimum encoding unit included in the maximum encoding unit. That is, the coding unit of the coding depth includes at least one minimum coding unit that holds the same coding information. By using this, if the neighboring minimum encoding units have the same depth encoding information, it can be the minimum encoding unit included in the same maximum encoding unit.

For example, the encoding information output through the output unit 130 may be classified into encoding information per depth unit and encoding information per prediction unit. The under-coding-by-depth coding unit information may include prediction mode information and partition size information. The encoding information to be transmitted for each prediction unit includes information about the estimation direction of the inter mode, information about the reference picture index of the inter mode, information on the motion vector, information on the chroma component of the intra mode, information on the interpolation mode of the intra mode And the like. Information on the maximum size of a coding unit defined for each picture, slice or GOP, and information on the maximum depth can be inserted into the header of the bitstream.

According to the simplest embodiment of the video coding apparatus 100, the coding unit for depth is a coding unit which is half the height and width of the coding unit of one layer higher depth. That is, if the size of the current depth encoding unit is 2Nx2N, the size of the lower depth encoding unit is NxN. In addition, the current encoding unit of 2Nx2N size can include a maximum of 4 sub-depth encoding units of NxN size.

Therefore, the video decoding apparatus 100 according to an embodiment determines an encoding unit of an optimal shape and size for each maximum encoding unit based on the size and the maximum depth of the maximum encoding unit determined in consideration of the characteristics of the current picture . In addition, since each encoding unit can be encoded by various prediction modes, frequency conversion methods, and the like, an optimal encoding mode can be determined in consideration of image characteristics of encoding units of various image sizes.

Therefore, if an image having a very high image resolution or a very large data amount is encoded in units of existing macroblocks, the number of macroblocks per picture becomes excessively large. This increases the amount of compression information generated for each macroblock, so that the burden of transmission of compressed information increases and the data compression efficiency tends to decrease. Therefore, the video encoding apparatus according to an embodiment can increase the maximum size of the encoding unit in consideration of the image size, and adjust the encoding unit in consideration of the image characteristic, so that the image compression efficiency can be increased.

2 shows a block diagram of a video decoding apparatus according to an embodiment of the present invention.

The video decoding apparatus 200 includes a receiving unit 210, an image data and encoding information extracting unit 220, and an image data decoding unit 230. The definition of various terms such as coding unit, depth, prediction unit, conversion unit, and information on various coding modes for various processing of the video decoding apparatus 200 according to an embodiment is the same as that of FIG. 1 and the video coding apparatus 100 Are the same as described above.

The receiving unit 205 receives and parses the bitstream of the encoded video. The image data and encoding information extracting unit 220 extracts image data for each maximum encoding unit from the parsed bit stream and outputs the extracted image data to the image data decoding unit 230. The image data and encoding information extracting unit 220 can extract information on the maximum size of the encoding unit of the current picture from the header of the current picture.

Also, the image data and encoding information extracting unit 220 extracts information on the encoding depth and the encoding mode for each maximum encoding unit from the parsed bitstream. The information on the extracted coding depth and coding mode is output to the image data decoding unit 230. That is, the video data of the bit stream can be divided into the maximum encoding units, and the video data decoding unit 230 can decode the video data per maximum encoding unit.

Information on the coding depth and the coding mode per coding unit can be set for one or more coding depth information, and the information on the coding mode for each coding depth includes information on partition type information, prediction mode information, Size information of the conversion unit, and the like. In addition, as the encoding depth information, depth-based segmentation information may be extracted.

The encoding depth and encoding mode information extracted by the image data and encoding information extracting unit 220 may be encoded in the encoding unit such as the video encoding apparatus 100 according to one embodiment, And information on the coding depth and coding mode determined to repeatedly perform coding for each unit to generate the minimum coding error. Therefore, the video decoding apparatus 200 can decode the data according to the coding scheme that generates the minimum coding error to recover the video.

The image data and encoding information extracting unit 220 can extract information on the encoding depth and the encoding mode for each minimum encoding unit. If information on the coding depth and the coding mode of the corresponding maximum coding unit is recorded for each minimum coding unit, the minimum coding units having the same coding depth and information on the coding mode are estimated as data units included in the same maximum coding unit . That is, if the minimum coding units of the same information are collected and decoded, it is possible to decode based on the coding units of the coding depth with the smallest coding error.

The image data decoding unit 230 decodes the image data of each maximum encoding unit based on the information on the encoding depth and the encoding mode for each maximum encoding unit to reconstruct the current picture. The image data decoding unit 230 can decode the image data for each coding unit of at least one coding depth based on the coding depth information for each coding unit. The decoding process may include a prediction process including intra prediction and motion compensation, and an inverse frequency conversion process.

The image data decoding unit 230 decodes each of the prediction units and prediction modes for each coding unit on the basis of the partition type information and the prediction mode information of the prediction unit of the coding unit for each coding depth for each coding unit, Or motion compensation.

In addition, the image data decoding unit 230 may perform frequency inverse transform for each encoding unit on the basis of the size information of the conversion unit of each encoding depth-based encoding unit for frequency inverse conversion for each maximum encoding unit .

The image data decoding unit 230 can determine the coding depth of the current maximum encoding unit using the division information by depth. If the partition information indicates that the current depth is to be decoded, the current depth is the depth of the encoding. Therefore, the image data decoding unit 230 can decode the current depth encoding unit for the image data of the current maximum encoding unit using the partition type, the prediction mode, and the conversion unit size information of the prediction unit.

That is, it is possible to observe the encoding information set for the minimum encoding unit and to decode the minimum encoding units that hold the encoding information including the same division information, into one data unit.

The video decoding apparatus 200 according to an exemplary embodiment recursively performs encoding for each maximum encoding unit in the encoding process to obtain information on an encoding unit that has generated the minimum encoding error and can use the encoded information for decoding the current picture have. That is, it is possible to decode video data in the optimal encoding unit for each maximum encoding unit.

Accordingly, even if an image with a high resolution or an excessively large amount of data is used, the information on the optimal encoding mode transmitted from the encoding end is used, and the image data is efficiently encoded according to the encoding unit size and encoding mode, Can be decoded and restored.

FIG. 3 shows the concept of a hierarchical coding unit.

An example of an encoding unit may include 32x32, 16x16, 8x8, and 4x4 from an encoding unit with a width x height of 64x64. In addition to the square-shaped encoding units, there may be encoding units whose width x height is 64x32, 32x64, 32x16, 16x32, 16x8, 8x16, 8x4, 4x8.

With respect to the video data 310, the resolution is set to 1920 x 1080, the maximum size of the encoding unit is set to 64, and the maximum depth is set to 2. With respect to the video data 320, the resolution is set to 1920 x 1080, the maximum size of the encoding unit is set to 64, and the maximum depth is set to 4. With respect to the video data 330, the resolution is set to 352 x 288, the maximum size of the encoding unit is set to 16, and the maximum depth is set to 2.

It is preferable that the maximum size of the coding size is relatively large in order to improve the coding efficiency as well as to accurately characterize the image characteristics when the resolution or the data amount is large. Therefore, the maximum size of the video data 310 and 320 having the higher resolution than the video data 330 can be selected to be 64. FIG.

The maximum depth indicates the total number of layers in the hierarchical encoding unit. Therefore, since the maximum depth of the video data 310 is 2, the encoding unit 315 of the video data 310 is encoded from a maximum encoding unit having a major axis size of 64, Units. On the other hand, since the maximum depth of the video data 330 is 2, the encoding unit 335 of the video data 330 has a depth of two layers from the encoding units having the major axis size of 16, Units.

Since the maximum depth of the video data 320 is 4, the encoding unit 325 of the video data 320 has a depth of four layers from 32 to 16, 8, and 4 Encoding units. The deeper the depth, the better the ability to express detail.

4 is a block diagram of an image encoding unit based on an encoding unit according to an embodiment of the present invention.

The image encoding unit 400 according to an exemplary embodiment includes operations to encode image data in the encoding depth determination unit 120 of the video encoding apparatus 100. That is, the intraprediction unit 410 performs intraprediction on the intra-mode encoding unit of the current frame 405, and the motion estimation unit 420 and the motion compensation unit 425 perform intraprediction on the current frame 405 of the inter- And a reference frame 495. The inter-frame estimation and the motion compensation are performed using the reference frame and the reference frame.

The data output from the intraprediction unit 410, the motion estimation unit 420 and the motion compensation unit 425 is output as a quantized transform coefficient through the frequency transform unit 430 and the quantization unit 440. The quantized transform coefficients are reconstructed into spatial domain data through the inverse quantization unit 460 and the frequency inverse transform unit 470 and the data of the reconstructed spatial domain is passed through the deblocking unit 480 and the loop filtering unit 490 Processed and output to the reference frame 495. [ The quantized transform coefficient may be output to the bitstream 455 via the entropy encoding unit 450.

The motion estimation unit 420, the motion compensation unit 425, and the frequency transformation unit 420, which are components of the image encoding unit 400, are applied to the video encoding apparatus 100 according to an embodiment of the present invention. The quantization unit 440, the entropy encoding unit 450, the inverse quantization unit 460, the frequency inverse transform unit 470, the deblocking unit 480, and the loop filtering unit 490, The work should be performed based on the depth encoding unit considering the maximum depth.

In particular, the intra prediction unit 410, the motion estimation unit 420, and the motion compensation unit 425 determine the prediction unit and the prediction mode in the coding unit in consideration of the maximum size and depth of the coding unit, and the frequency conversion unit 430 ) Should consider the size of the conversion unit considering the maximum size and depth of the encoding unit.

5 is a block diagram of an image decoding unit based on an encoding unit according to an embodiment of the present invention.

The bit stream 505 passes through the parsing unit 510 and the encoded video data to be decoded and the encoding-related information necessary for decoding are parsed. The encoded video data is output as inverse quantized data through the entropy decoding unit 520 and the inverse quantization unit 530, and the image data in the spatial domain is restored through the frequency inverse transform unit 540.

The intra-prediction unit 550 performs intraprediction on the intra-mode encoding unit for the video data in the spatial domain, and the motion compensating unit 560 performs intra-prediction on the intra-mode encoding unit using the reference frame 585 And performs motion compensation for the motion compensation.

The data in the spatial domain that has passed through the intra prediction unit 550 and the motion compensation unit 560 may be post-processed through the deblocking unit 570 and the loop filtering unit 580 and output to the reconstruction frame 595. Further, the post-processed data via deblocking unit 570 and loop filtering unit 580 may be output as reference frame 585.

In order to decode the image data in the image data decoding unit 230 of the video decoding apparatus 200, operations after the parsing unit 510 of the image decoding unit 500 according to the embodiment may be performed.

The entropy decoding unit 520, the inverse quantization unit 530, and the frequency inverse transforming unit 520, which are the components of the video decoding unit 500, in order to be applied to the video decoding apparatus 200 according to one embodiment. The intraprediction unit 550, the motion compensation unit 560, the deblocking unit 570 and the loop filtering unit 580 all have to perform an operation based on the encoding unit of the encoding depth for each maximum encoding unit .

In particular, the intra prediction unit 550 and the motion compensation unit 560 determine a coding unit and a prediction mode in consideration of the maximum size and depth of a coding unit, and the frequency inverse transform unit 540 sets the maximum size and depth of the coding unit The size of the conversion unit should be considered.

FIG. 6 illustrates a depth-based coding unit and a prediction unit according to an embodiment of the present invention.

The video encoding apparatus 100 and the video decoding apparatus 200 according to an exemplary embodiment use a hierarchical encoding unit to consider an image characteristic. The maximum height, width, and maximum depth of the encoding unit may be adaptively determined according to the characteristics of the image, or may be variously set according to the demand of the user. The size of each coding unit may be determined according to the maximum size of a predetermined coding unit.

The hierarchical structure 600 of the encoding unit according to an embodiment shows a case where the maximum height and width of the encoding unit is 64 and the maximum depth is 4. Since the depth is deeper along the vertical axis of the hierarchical structure 600 of the encoding unit according to the embodiment, the height and width of the encoding unit for each depth are divided. In addition, along the horizontal axis of the hierarchical structure 600 of the coding unit, a prediction unit which is a partial data unit on which prediction coding of each depth coding unit is based is shown.

That is, the coding unit 610 is the largest coding unit among the hierarchical structures 600 of the coding units and has a depth of 0, and the size of the coding units, that is, the height and the width, is 64x64. A depth-1 encoding unit 620 having a size of 32x32, a depth-2 encoding unit 620 having a size 16x16, a depth-3 encoding unit 640 having a size 8x8, a depth 4x4 having a size 4x4, There is an encoding unit 650. An encoding unit 650 of depth 4 of size 4x4 is the minimum encoding unit.

The partial data units are arranged as a prediction unit of the encoding unit along the horizontal axis for each depth. That is, the prediction unit of the encoding unit 610 having a size of 64x64 with a depth of 0 is a partial data unit 610 having a size of 64x64, partial data units 612 having a size of 64x32 included in the encoding unit 610 of size 64x64, Partial data units 614 of size 32x64, and partial data units 616 of size 32x32. Conversely, the encoding unit may be a minimum-sized square data unit including the conversion units 610, 612, 614, and 616.

Likewise, the prediction unit of the encoding unit 620 of the size 32x32 of the depth 1 is the partial data unit 620 of the size 32x32, the partial data units 622 of the size 32x16, and the partial data unit 620 of the size 32x32 included in the encoding unit 620 of the size 32x32, Partial data units 624 of size 16x32, partial data units 626 of size 16x16.

Likewise, the prediction unit of a 16x16 size 16x16 encoding unit is a 16x16 partial data unit 630, a 16x8 partial data unit 632, and a 16x16 partial data unit 630 included in the 16x16 encoding unit 630, Partial data units 634 of size 8x16, and partial data units 636 of size 8x8.

Likewise, the prediction unit of the encoding unit 640 of the size 8x8 of the depth 3 includes the partial data unit 640 of the size 8x8, the partial data units 642 of the size 8x4, and the partial data units 640 of the size 8x8 included in the encoding unit 640 of the size 8x8, Partial data units 644 of size 4x8, and partial data units 646 of size 4x4.

Finally, a coding unit 650 of size 4x4 is the minimum coding unit and the coding unit of the lowest depth, and the prediction unit is a data unit 650 of size 4x4.

The coding depth determiner 120 of the video coding apparatus 100 according to an exemplary embodiment of the present invention determines the coding depth of the maximum coding unit 610 by multiplying the coding unit of each depth included in the maximum coding unit 610 Encoding is performed.

The number of coding units per depth to include data of the same range and size increases as the depth of the coding unit increases. For example, for data containing one coding unit at depth 1, four coding units at depth 2 are required. Therefore, in order to compare the encoding results of the same data by depth, they should be encoded using a single depth 1 encoding unit and four depth 2 encoding units, respectively.

For each depth-of-field coding, encoding is performed for each prediction unit of the depth-dependent coding unit along the horizontal axis of the hierarchical structure 600 of the coding unit, and a representative coding error, which is the smallest coding error at the corresponding depth, is selected . In addition, depths are deepened along the vertical axis of the hierarchical structure 600 of encoding units, and the minimum encoding errors can be retrieved by comparing the representative encoding errors per depth by performing encoding for each depth. The depth at which the minimum coding error occurs among the maximum coding units 610 can be selected as the coding depth and the partition type of the maximum coding unit 610. [

FIG. 7 shows a relationship between an encoding unit and a conversion unit according to an embodiment of the present invention.

The video coding apparatus 100 or the video decoding apparatus 200 according to an embodiment encodes or decodes an image in units of coding units smaller than or equal to the maximum coding unit for each maximum coding unit. The size of the conversion unit for frequency conversion during encoding can be selected based on data units that are not larger than the respective encoding units.

For example, in the video encoding apparatus 100 or the video encoding apparatus 200 according to an embodiment, when the current encoding unit 710 is 64x64 size, the 32x32 conversion unit 720 The frequency conversion can be performed.

In addition, the data of the encoding unit 710 of 64x64 size is encoded by performing the frequency conversion with the conversion units of 32x32, 16x16, 8x8, and 4x4 size of 64x64 or smaller, respectively, and then the conversion unit having the smallest error with the original Can be selected.

FIG. 8 illustrates depth-specific encoding information, in accordance with an embodiment of the present invention.

The encoding information encoding unit of the video encoding apparatus 100 according to the embodiment is information on an encoding mode, and includes information on a partition type 800, information on a prediction mode 810, Information 820 on the unit size can be encoded and transmitted.

The partition type information 800 indicates information on a type in which the current encoding unit is divided as a prediction unit for predictive encoding of the current encoding unit. For example, the current encoding unit CU_0 of depth 0 and size 2Nx2N includes a prediction unit 802 of size 2Nx2N, a prediction unit 804 of size 2NxN, a prediction unit 806 of size Nx2N, a prediction unit 808 of size NxN ) And can be used as a prediction unit. In this case, information 800 regarding the partition type of the current encoding unit includes a prediction unit 802 of size 2Nx2N, a prediction unit 804 of size 2NxN, a prediction unit 806 of size Nx2N, and a prediction unit 808 of size NxN. Lt; / RTI >

The information 810 on the prediction mode indicates the prediction mode of each prediction unit. The prediction unit indicated by the information 800 relating to the partition type is predicted to be one of the intra mode 812, the inter mode 814 and the skip mode 816 through the prediction mode information 810, for example. Can be set.

In addition, the information 820 on the conversion unit size indicates whether to perform frequency conversion on the basis of which conversion unit the current encoding unit is performed. For example, the conversion unit may be one of a first intra-conversion unit size 822, a second intra-conversion unit size 824, a first inter-conversion unit size 826, have.

The encoding information extracting unit of the video decoding apparatus 200 according to the embodiment extracts the information 800 about the partition type, the information 810 about the prediction mode, the information 820 about the conversion unit size ) Can be extracted and used for decoding.

FIG. 9 shows a depth encoding unit according to an embodiment of the present invention.

Partition information may be used to indicate changes in depth. The division information indicates whether the current-depth encoding unit is divided into lower-depth encoding units.

The prediction unit 910 for the prediction encoding of the coding units of depth 0 and 2N_0x2N_0 has a partition type 912 of 2N_0x2N_0 size, a partition type 914 of 2N_0xN_0 size, a partition type 916 of N_0x2N_0 size, a partition of size N_0xN_0 Type < / RTI >

For each partition type, predictive encoding should be repeatedly performed for each prediction unit of 2N_0x2N_0 size, two 2N_0xN_0 size prediction units, two N_0x2N_0 size prediction units, and four N_0xN_0 size prediction units. For a prediction unit of size 2N_0x2N_0, size N_0x2N_0, size 2N_0xN_0, and size N_0xN_0, predictive coding may be performed in intra mode and inter mode. The skip mode can be performed only for predictive encoding in a prediction unit of size 2N_0x2N_0.

If the coding error by the partition type 918 of the size N_0xN_0 is the smallest, the depth 0 is changed to 1 (920), and the coding units 922, 924, 926 and 928 of the partition type of the depth 2 and the size N_0xN_0 are changed The minimum coding error can be repeatedly searched for.

Since encoding is repeatedly performed on the encoding units 922, 924, 926, and 928 of the same depth, encoding of only one of the encoding units of depth 1, for example, will be described. The prediction unit 930 for predicting the coding unit of the depth 1 and the size 2N_1x2N_1 (= N_0xN_0) includes a partition type 932 of size 2N_1x2N_1, a partition type 934 of size 2N_1xN_1, a partition type 936 of size N_1x2N_1, , And a partition type 938 of size N_1xN_1. For each partition type, predictive coding should be repeatedly performed for each prediction unit of a size 2N_1x2N_1, a prediction unit of two sizes 2N_1xN_1, a prediction unit of two sizes N_1x2N_1, and a prediction unit of four sizes N_1xN_1.

If the coding error by the partition type 938 of the size N_1xN_1 is the smallest, the coding units 942, 944, 946 and 948 of the depth 2 and the size N_2xN_2 are changed while changing the depth 1 to the depth 2 (940) The minimum coding error can be repeatedly searched for.

If the maximum depth is d, the depth-based segmentation information can be set until the depth d-1. That is, the prediction unit 950 for predictive coding of the coding unit of the depth d-1 and the size 2N_ (d-1) x2N_ (d-1) A partition type 954 of size 2N_ (d-1) xN_ (d-1), a partition type 956 of size N_ (d-1) x2N_ 1) xN_ (d-1) < / RTI >

(D-1) x2N_ (d-1), two predicted units of two sizes 2N_ (d-1) (d-1) x2N_ (d-1), four sizes N_ (d-1) xN_ (d-1). Since the maximum depth is d, the coding unit 952 of depth d-1 no longer undergoes the division process.

The video coding apparatus 100 according to an exemplary embodiment compares depth-based coding errors to determine the depth of coding for the coding unit 912, and selects the depth at which the smallest coding error occurs.

For example, a coding error for a coding unit of depth 0 is predicted for each partition type 912, 914, 916, and 918, and a prediction unit in which the smallest coding error occurs is determined. Similarly, a prediction unit having the smallest coding error can be searched for every depth 0, 1, ..., d-1. At the depth d, the coding error can be determined through predictive coding based on the prediction unit 960, which is a coding unit of size 2N_dx2N_d.

In this way, the minimum coding error of each of the depths 0, 1, ..., d-1, and d is compared and the depth with the smallest error is selected to be determined as the coding depth. The coding depth and the prediction unit of the corresponding depth can be encoded and transmitted as information on the coding mode. In addition, since the coding unit must be divided from the depth 0 to the coding depth, only the division information of the coding depth is set to '0', and the division information by depth is set to '1' except for the coding depth.

The encoding information extracting unit 220 of the video decoding apparatus 200 according to an exemplary embodiment may extract information on the encoding depth and prediction unit of the encoding unit 912 and decode the encoding unit 912. [ The video decoding apparatus 200 according to an exemplary embodiment of the present invention uses division information by depth to grasp the depth with the division information of '0' as a coding depth and can use it for decoding using information on the coding mode for the corresponding depth have.

FIGS. 10A, 10B, and 10C illustrate the relationship between an encoding unit, a prediction unit, and a frequency conversion unit according to an embodiment of the present invention.

The coding unit 1010 is coding units for coding depth determined by the video coding apparatus 100 according to the embodiment with respect to the maximum coding unit. The prediction unit 1060 is a prediction unit of each coding depth unit among the coding units 1010 and the conversion unit 1070 is a conversion unit of each coding depth unit.

When the depth of the maximum encoding unit is 0, the depth of the encoding units 1012 and 1054 is 1 and the depth of the encoding units 1014, 1016, 1018, 1028, 1050, The coding units 1020, 1022, 1024, 1026, 1030, 1032 and 1048 have a depth of 3 and the coding units 1040, 1042, 1044 and 1046 have a depth of 4.

A portion (1014, 1016, 1022, 1032, 1048, 1050, 1052, 1054) of the prediction units 1060 is a type in which the coding unit is divided. That is, the prediction units 1014, 1022, 1050 and 1054 are partition types of 2NxN, the prediction units 1016, 1048 and 1052 are partition types of Nx2N, and the prediction units 1032 are partition types of NxN. That is, the prediction unit of the depth-dependent coding units 1010 is smaller than or equal to each coding unit.

The image data of a part 1052 of the conversion units 1070 is subjected to frequency conversion or frequency inverse conversion in units of data smaller in size than the encoding unit. The conversion units 1014, 1016, 1022, 1032, 1048, 1050, 1052, and 1054 are data units of different sizes or types when compared with the prediction units of the prediction units 1060. That is, the video encoding apparatus 100 according to the embodiment and the video decoding apparatus 200 according to an embodiment can perform the intra prediction / motion estimation / motion compensation operation for the same encoding unit and the frequency conversion / , Each based on a separate data unit.

FIG. 11 shows encoding information for each encoding unit according to an embodiment of the present invention.

The output unit 130 of the video encoding apparatus 100 according to an exemplary embodiment outputs encoding information for each encoding unit and the encoding information extracting unit 220 of the video decoding apparatus 200 according to an embodiment extracts encoding information for each encoding unit It is possible to extract the encoding information.

The encoding information may include division information for the encoding unit, partition type information, prediction mode information, and conversion unit size information. The encoding information shown in FIG. 11 is an example that can be set in the video encoding apparatus 100 according to the embodiment and the video encoding apparatus 200 according to an embodiment.

The division information may indicate the coding depth of the corresponding encoding unit. That is, since depths that are no longer divided according to the division information are coding depths, partition type information, prediction mode, and conversion unit size information can be defined with respect to the coding depth. When it is necessary to further divide by one division according to the division information, encoding should be performed independently for each of four divided sub-depth coding units.

As the partition type information, the partition type of the conversion unit of the coding unit of the coding depth can be represented by 2Nx2N, 2NxN, Nx2N and NxN. The prediction mode may be represented by one of an intra mode, an inter mode, and a skip mode. The intra mode and the inter mode can be defined in the partition types 2Nx2N, 2NxN, Nx2N and NxN, and the skip mode can be defined only in the partition type 2Nx2N. The conversion unit size can be set to two kinds of sizes in the intra mode and two kinds of sizes in the inter mode.

The encoding unit-specific encoding information of the belonging encoding depth may be stored for each minimum encoding unit in the encoding unit. Therefore, if encoding information held in each of the adjacent minimum encoding units is checked, it can be confirmed whether or not the encoding information is included in the encoding unit of the same encoding depth. In addition, since the encoding unit of the encoding depth can be identified by using the encoding information held in the minimum encoding unit, the distribution of encoding depths in the maximum encoding unit can be inferred.

In this case, when the current encoding unit is predicted with reference to the neighboring data unit, the encoding information of the minimum encoding unit in the depth encoding unit adjacent to the current encoding unit is directly used, so that the data of the minimum encoding unit can be referred to.

In yet another embodiment, the encoding information of the depth encoding unit may be stored only for the minimum encoding unit represented in the depth encoding unit. In this case, when the current encoding unit is predicted by referring to the surrounding encoding unit, the data adjacent to the current encoding unit in the depth encoding unit may be retrieved using the encoding information of the adjacent depth encoding unit.

12 shows a flowchart of a video coding method according to an embodiment of the present invention.

In step 1210, the current picture is divided into at least one maximum encoding unit. In addition, the maximum depth indicating the possible total number of divisions may be set in advance.

In step 1220, the area of the maximum coding unit is coded at least in one divided area for each depth, and the depth at which the final coding result is output for each of at least one of the divided areas is determined. The maximum encoding unit is divided into stages, and each time the depth is deepened, it is necessary to repeatedly perform encoding for each lower-depth encoding unit.

For each depth-based coding unit, the conversion unit for each partition type having the smallest coding error should be determined. In order to determine the coding depth that causes the minimum coding error of the coding unit, the coding error should be measured and compared for each coding unit of each depth.

In step 1230, video data as a final encoding result for each of at least one divided area and information on the coding depth and coding mode are output for each maximum coding unit. The information on the encoding mode may include information on the encoding depth or division information, partition type information of the encoding depth, prediction mode information, and conversion unit size information. Information on the encoded encoding mode can be transmitted to the decoding end together with the encoded video data.

13 shows a flowchart of a video decoding method according to an embodiment of the present invention.

In step 1310, the bitstream for the encoded video is received and parsed.

In step 1320, the image data of the current picture allocated to the largest coding unit of the maximum size from the parsed bitstream, and information on the coding depth and coding mode of each coding unit are extracted. The coding depth for each maximum coding unit is the depth selected with the smallest coding error for each maximum coding unit in the process of coding the current picture. The encoding of the maximum encoding unit is the image data encoded based on at least one data unit obtained by dividing the maximum encoding unit hierarchically by depth. Accordingly, the decoding efficiency of the image can be improved by decoding each image data after determining the coding depth for each coding unit.

In step 1330, the image data of each maximum encoding unit is decoded based on the information on the encoding depth and the encoding mode for each maximum encoding unit. The decoded image data can be reproduced by a reproducing apparatus, stored in a storage medium, or transmitted via a network.

Hereinafter, video coding and video decoding considering the skipping and dividing order according to an embodiment of the present invention will be described below with reference to FIGS. 14 to 18. FIG.

FIG. 14 shows a video encoding apparatus considering skip and division order according to an embodiment of the present invention.

The video coding apparatus 1400 considering the skip and division order according to an exemplary embodiment includes a maximum coding unit division unit 1410, a coding depth and coding mode determination unit 1420, and an output unit 1430.

The video coding apparatus 1400 considering the skipping and dividing order according to an exemplary embodiment is a specific embodiment of the video coding apparatus 100 according to an embodiment and may include a maximum coding unit of the video coding apparatus 100 according to an embodiment The coding depth determination unit 120 and the output unit 130 are divided into a maximum coding unit division unit 1410, a coding depth and coding mode determination unit 1420 and an output unit 1430 .

The maximum coding unit division unit 1410 according to an embodiment divides a picture of an input picture into a maximum coding unit of a predetermined size and outputs the picture data of the maximum coding unit to the coding depth and coding mode decision unit 1420 .

The coding depth and coding mode decision unit 1420 according to an embodiment divides the areas of the maximum coding unit input from the maximum coding unit division unit 1410 hierarchically according to deeper depth, And performs coding based on the depth-dependent coding units according to depths corresponding to the number of divisions independently for each area. The coding depth and coding mode determiner 1420 according to an embodiment determines a coding depth and a coding mode for outputting a coding result for each area. The encoding mode may include information on the encoding depth, the partition type in the encoding unit of the encoding depth, the prediction mode, the size of the conversion unit, and the like.

The encoding depth and encoding mode determination unit 1420 according to an embodiment determines the encoding depth and the encoding mode to output the encoding result for each independent region of the maximum encoding unit, The encoding depth and the encoding mode related to the encoding depth with the minimum encoding error with the original image data can be searched.

Information on a coding depth related to the coding depth determined by the coding depth and coding mode decision unit 1420 according to an embodiment and the coding result are output to the output unit 1430. [

The output unit 1430 according to an exemplary embodiment outputs information on the coding depth and coding mode for each coding unit and the coded video data. The encoding mode according to one embodiment includes skip mode information indicating whether the prediction mode of the depth-dependent coding unit is a skip mode and division information indicating whether the prediction mode is divided into lower depths. The output unit 1430 according to the embodiment can selectively determine the skip mode information of the depth-dependent coding unit and the output order of the division information.

The output unit 1430 according to one embodiment can output information indicating the order of selectively determined skip mode information and division information. Accordingly, the output unit 1430 outputs the information on the encoding mode including the skip mode information and the division information listed in the selectively determined order and the encoded video data together with the order information of the skip mode information and the division information .

The order of the skip mode information and the division information selectively determined for each depth encoding unit according to an exemplary embodiment may be at least one of a video sequence to which the depth encoding unit belongs, a slice, a slice type according to the prediction direction, ≪ / RTI >

In addition, the order of the skip mode information and the division information selectively determined for each depth-dependent coding unit according to an exemplary embodiment may be separately determined for each depth-based coding unit in the maximum coding unit.

For example, with respect to the maximum encoding unit, the skip mode information may precede the segmentation information, and for depth-based encoding units of lower depth than the maximum encoding unit, the segmentation information may be determined to precede the skip mode information.

The output unit 1430 according to the embodiment can encode the division information and the skip mode information into one division and skip information. In addition, the output unit 1430 according to the embodiment may allocate different bit numbers to the division and skip information according to the occurrence frequency of the combination of the division information and the skip mode information.

For example, in the case where the division information indicating that the encoding unit is divided and the skip mode information indicating that it is not skipped are coded together, they can be allocated as one-bit division and skip information. In addition, in the remaining cases other than the case of dividing information indicating division of the encoding unit and skip mode information indicating that it is not predicted in the skip mode, the division and skip information for the encoding unit is allocated to two bits and output .

15 shows a video decoding apparatus considering skip and division order according to an embodiment of the present invention.

The video decoding apparatus 1500 considering the skip and division order according to an embodiment includes a receiving unit 1510, a data extracting unit 1520, and a decoding unit 1530. [ The video decoding apparatus 1500 considering the skipping and dividing order according to an embodiment may be a specific embodiment of the video decoding apparatus 200 according to an embodiment. The receiving unit 210, the video data and encoding information extracting unit 220 and the video data decoding unit 230 of the video decoding apparatus 200 according to the embodiment are respectively provided for the video decoding apparatus The data extraction unit 1520, and the decryption unit 1530 of FIG.

The receiving unit 1520 according to an exemplary embodiment receives and parses a bitstream of the encoded video.

The data extracting unit 1520 according to an embodiment receives the parsed bit stream from the receiving unit 1520 and extracts information on the encoding depth and the related encoding mode and the encoded video data for each maximum encoding unit from the bit stream . The data extracting unit 1520 extracts information on the skip mode information of the depth encoding unit and the information on the order of the segmentation information from the bitstream.

The data extracting unit 1520 according to the embodiment reads the skip mode information and the division information from the information on the encoding mode based on the extracted information on the order of the skip mode information and the division information, The encoded video data can be extracted from each depth-based encoding unit based on the information and the division information.

The order of the skip mode information and the division information according to one embodiment may be selectively set according to at least one of a video sequence to which the depth-dependent coding unit belongs, a slice type, a slice type according to a prediction direction, and a quantization parameter of a data unit have. In addition, the order of the skip mode information and the division information according to one embodiment may be selectively set according to the depth of each depth encoding unit in the maximum encoding unit.

For example, if the depth-dependent coding unit is the maximum coding unit, skipping according to the skip mode information may be determined prior to division according to the division information, according to the order of the skip mode information and the division information. In addition, when the depth-dependent coding unit is not the maximum coding unit, whether or not to divide according to the division information may be determined before skipping according to the skip mode information.

The data extracting unit 1520 according to an embodiment can extract one division and skip information in which the skip mode information and the division information are integrated with respect to each depth-dependent coding unit. When one bit of segmentation and skip information is extracted, the corresponding encoding unit can be predicted in skip mode without segmentation. If two bits of segmentation and skip information are read, Is determined, and skipping of the encoding unit can be determined based on the skip mode information.

The decoding unit 1530 according to one embodiment decodes the video data encoded for each coding unit of at least one coding depth for each coding unit of the coded video data on the basis of the coding depth and coding mode information .

The decoded and restored video data may be transmitted to various terminals capable of being reproduced or may be stored in a storage device.

According to one embodiment, the video coding apparatus 1400 considering the skipping and dividing order and the video decoding apparatus 1500 considering the skipping and dividing order according to an embodiment may use the skip mode information and the skip mode information in consideration of the data unit, The order of the division information can be determined. Therefore, the order of the skip mode information and the division information may be determined in consideration of the occurrence frequency of the skip mode, the skip mode information, and the order of the division information in the decoding of the video data in consideration of the total number of bits of the skip mode information and the division information . The skip mode information of the depth-dependent coding unit and the order of the division information can be set, so that the transmission efficiency of the coded data can be further improved.

FIG. 16 shows encoding units for each encoding depth of a maximum encoding unit according to an embodiment of the present invention.

In order to explain the procedure of reading the output result from the output unit 1430 in consideration of the order of the skip mode information and the division information according to the embodiment by the data extraction unit 1520 according to an embodiment, (1600).

The depth encoding units included in the maximum encoding unit 1600 are the maximum encoding unit 1600 of depth 0, the encoding units 1610, 1620, 1630 and 1640 of depth 1, the encoding units 1622, 1624, 1626, 1628). The depth coding units 1610, 1630 and 1640 of the coding depth 1 and the depth coding units 1622, 1624, 1626 and 1628 of the coding depth 2 are determined as the coding depths for the maximum coding unit 1600 State. It is also assumed that the prediction modes of the coding units 1610, 1630 and 1640 of depth 1 are set to the skip mode and the prediction modes of the coding units 1622, 1624, 1626 and 1628 of the depth 2 are not the skip mode .

The data extracting unit 1520 of the video decoding apparatus 1500 considering the skip and dividing order will firstly describe an embodiment in which the division information is read ahead of the skip mode information with respect to the maximum coding unit 1600 of the current picture. In the embodiment in which the division information precedes the skip mode information, if the division information is 1, the division information of the lower-depth encoding units is read recursively. If the division information is 0, the skip mode information of the encoding units . Accordingly, the reading order of the division information and the skip mode information is as follows.

The division information 1 for the maximum coding unit 1600, the division information 0 for the coding unit 1610 of the depth 1 and the division information 1 for the skip information 1, the coding unit 1620 for the depth 1, The division information 0 and the skip information 0 for the coding unit 1626 of the depth 2, the division information 0 and the skip information 0 for the coding unit 1624 of the depth 2, the division information 0 and the skip information 0 for the coding unit 1624 of the depth 2, The division information 0 and the skip information 0 for the coding unit 1628 of the depth 1, the division information 0 and the skip information 0 for the coding unit 1628 of the depth 1, the division information 0 and the skip information 1 for the coding unit 1630 of the depth 1, 1 can be read out in order. Therefore, the total number of bits of the division information and the skip mode information for the maximum encoding unit 1600 is 16.

Further, another embodiment in which the data extracting unit 1520 of the video decoding apparatus 1400 considering the skipping and dividing order reads the skip mode information before the division information with respect to the maximum coding unit 1600 of the current picture do. In the case of the skip mode information preceded by the division information, if the skip mode information is 1, it is not necessary to set the division information of the lower-depth encoding units, and if the skip mode information is 0, the division information is read . The setting procedure of the division information and the skip mode information is as follows.

The skip mode information 0 for the maximum encoding unit 1600, the skip mode information 1 for the encoding unit 1610 of the depth 1, the skip mode information 0 and the division information 1 for the encoding unit 1620 of the depth 1, Skip mode information 0 and division information 0 for the coding unit 1622, skip mode information 0 and division information 0 for the coding unit 1624 at the depth 2, skip mode information 0 for the coding unit 1626 at the depth 2, The skip mode information 0 and the division information 0 for the coding unit 1628 of the depth information 0, the depth 2, the skip mode information 1 for the coding unit 1630 at the depth 1, and the skip mode information 1 for the coding unit 1640 at the depth 1, Information 1 can be read out in order. In this case, the total number of bits of the division information and skip mode information for the maximum encoding unit 1600 is 14.

As described above, the total number of bits of the skip mode information for each depth-dependent coding unit may be varied by changing the order of the division information and the skip mode information. For example, when the coding unit of the higher depth is predictively coded in the skip mode, the division information for the lower-depth coding unit does not need to be coded. Therefore, when there are many areas to be predictively coded in the skip mode, It is advantageous in terms of bit rate to be encoded so as to precede it. However, it is advantageous in terms of bit rate that the division information is coded so as to precede the skip mode information for an image with few skip modes. Therefore, the bit rate can be adjusted by adjusting the order of the division information and skip mode information according to the characteristics of the image, the level and the depth of the data unit, and the like.

The above-described embodiment with reference to FIG. 16 is a case in which skip mode information or division information is set to be read ahead in units of pictures. The video coding apparatus 1400 considering the skip and the dividing order according to the embodiment and the video decoding apparatus 1500 considering the skipping and dividing order according to the embodiment are not limited to the embodiment of Fig. 16, The quantization parameter, the slice type according to the prediction direction, or the like, the output order or the reading order of the skip mode information or the division information can be determined.

Also, the segmentation information and the skip mode information may be combined and used as one segmentation and skip information. According to one embodiment, the video coding apparatus 1400 considering the skip and the dividing order and the video decoding apparatus 1500 considering the skipping and dividing order according to one embodiment are capable of performing the skipping and dividing operations based on the occurrence frequency of the division information and the skip mode information, Division and skip information allocated to one combination of division information and skip mode information having a high occurrence frequency can be used and division and skip information allocated to two combinations each having a low occurrence frequency can be used.

When the division information is set to precede the skip mode information as an example, the division information of the lower-depth encoding unit is read immediately when the division information of the current-depth encoding unit is 1, so that the skip mode of the current encoding unit is not read . Therefore, the combination of the division information and the skip mode information may generate three combinations of the division information 1, the division information 0, the skip mode information 0, the division information 0, and the skip mode information 1. For example, if the frequency of occurrence of the combination of the division information 0 and the skip mode information 1 is the highest, one bit is assigned to this combination, and the case of the division information 1 and the case of the combination of the division information 0 and the skip mode information 2 bits can be allocated.

17 illustrates a video coding method considering skip and division order according to an embodiment of the present invention.

In step 1710, the picture is divided into coding units of a predetermined maximum size.

In step 1720, for each maximum encoding unit, the maximum encoding unit is hierarchically divided as the depth is deeper, and the encoding depth based encoding unit is performed for each reduced area, The encoding mode for the depth encoding unit is determined.

In step 1730, the information indicating the order of the skip mode information and the division information selectively determined for each depth-dependent coding unit, the skip mode information listed in the determined order, and the information about the encoding mode including the division information and the encoded video data, And outputted every maximum encoding unit.

Further, the division and skip information integrated into one for the combination of the division information and the skip mode information can be set. Further, the number of bits of the division and skip information can be allocated based on the occurrence frequency of the combination of the division information and the skip mode information.

18 shows a video decoding method considering a skip and a dividing order according to an embodiment of the present invention.

In step 1810, a bitstream for the encoded video is received and parsed.

In step 1820, information on the skip mode information of the depth-dependent coding unit and the information on the order of the division information is extracted from the bit stream, and in accordance with the order of the skip mode information and the division information, the coding depth and coding mode And the encoded video data are extracted.

Further, the division and skip information integrated into the combination of the division information and the skip mode information can be read. The video decoding method according to the embodiment can read the combination of the division information and the skip mode information based on the division and skip information differentially allocated based on the occurrence frequency of the combination of the division information and the skip mode information.

In step 1830, the video data encoded for each of the encoding units of at least one encoding depth is decoded for each of the maximum encoding units of the encoded video data, based on the information about the encoding depth and the encoding mode.

The above-described embodiments of the present invention can be embodied in a general-purpose digital computer that can be embodied as a program that can be executed by a computer and operates the program using a computer-readable recording medium. The computer-readable recording medium includes a storage medium such as a magnetic storage medium (e.g., ROM, floppy disk, hard disk, etc.) and an optical reading medium (e.g., CD-ROM, DVD, etc.).

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

Claims (2)

Obtaining division information of a maximum encoding unit indicating whether a maximum encoding unit is divided into smaller encoding units from a bitstream;
Obtaining skip mode information of the maximum encoding unit from the bitstream when the division information of the maximum encoding unit indicates non-division, and performing prediction based on the skip mode information;
Dividing a height and a width of the maximum coding unit when the division information of the maximum coding unit indicates division, and determining encoding units of the current depth,
Wherein the step of performing prediction based on the skip mode information comprises:
Wherein when the maximum coding unit is predicted in a skip mode according to skip mode information of the maximum coding unit not divided according to the division information, based on motion information determined using motion information of a prediction unit adjacent to the maximum coding unit Generating a predicted value of the maximum encoding unit by performing prediction on the maximum encoding unit and generating a reconstruction block of the maximum encoding unit using the predicted value of the maximum encoding unit; And
When the maximum encoding unit is not predicted in the skip mode according to the skip mode information of the maximum encoding unit that is not divided according to the division information, determines one or more prediction units from the maximum encoding unit, Generating a predicted value of the maximum encoding unit, determining one or more conversion units from the maximum encoding unit, performing inverse conversion on the at least one conversion unit to generate a residue of the maximum encoding unit, And generating a reconstruction block of the maximum encoding unit using the prediction value and the residue,
Wherein determining the current depth encoding units comprises:
Acquiring, from the bitstream, division information of one current-depth encoding unit from the current-depth encoding units when the size of the current-depth encoding unit is greater than a minimum size of the encoding unit, Dividing the coding unit of one current depth into coding units of lower depth independent of neighboring coding units if the division information of the coding unit of the current coding unit indicates division. A video decoding apparatus comprising:
A data extracting unit for obtaining, from a bitstream, division information of a maximum encoding unit indicating whether a maximum encoding unit is divided into smaller encoding units; And
When skip mode information of the maximum coding unit is obtained from the bit stream when the division information of the maximum coding unit indicates non-division, prediction is performed based on the skip mode information, and inverse conversion is performed on one or more conversion units And a decoding unit for dividing a height and a width of the maximum encoding unit to determine encoding units of the current depth when the division information of the maximum encoding unit indicates division,
When the maximum encoding unit is predicted in the skip mode according to the skip mode information of the maximum encoding unit not divided according to the segmentation information, the decoding unit decodes the maximum encoding unit using the motion information of the prediction unit adjacent to the maximum encoding unit Generating a predicted value of the maximum encoding unit by performing a prediction on the maximum encoding unit based on the motion information, generating a reconstruction block of the maximum encoding unit using the predicted value of the maximum encoding unit,
Wherein the decoding unit determines one or more prediction units from the maximum coding unit when the maximum coding unit is not predicted in the skip mode according to skip mode information of the maximum coding unit not divided according to the division information, A predictor for the prediction unit is generated to generate a prediction value of the maximum encoding unit, the at least one conversion unit is determined from the maximum encoding unit, and the inverse conversion is performed for the at least one conversion unit, Generates a reconstruction block of the maximum encoding unit using the prediction value and the residue,
Wherein the data extracting unit obtains division information of one current-depth encoding unit from the bit-stream among the current-depth encoding units when the size of the current-depth encoding unit is larger than the minimum size of the encoding unit, Wherein the decoding unit divides the coding unit of one current depth into coding units of lower depth independently of neighboring coding units if the division information of the coding unit of the current depth indicates division Video decoding apparatus.

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