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WO2014051404A1 - Appareil de codage/décodage et procédé de codage/décodage utilisant le partage d'informations de codage/décodage d'image en couleurs et d'image de profondeur - Google Patents

Appareil de codage/décodage et procédé de codage/décodage utilisant le partage d'informations de codage/décodage d'image en couleurs et d'image de profondeur Download PDF

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Publication number
WO2014051404A1
WO2014051404A1 PCT/KR2013/008733 KR2013008733W WO2014051404A1 WO 2014051404 A1 WO2014051404 A1 WO 2014051404A1 KR 2013008733 W KR2013008733 W KR 2013008733W WO 2014051404 A1 WO2014051404 A1 WO 2014051404A1
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WO
WIPO (PCT)
Prior art keywords
information
depth image
encoding
sharing
color image
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Ceased
Application number
PCT/KR2013/008733
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English (en)
Korean (ko)
Inventor
오병태
오관정
이재준
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Priority claimed from KR1020130112433A external-priority patent/KR20140043027A/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of WO2014051404A1 publication Critical patent/WO2014051404A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/106—Processing image signals
    • H04N13/161—Encoding, multiplexing or demultiplexing different image signal components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/119—Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/189—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding
    • H04N19/196—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters
    • H04N19/197—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters including determination of the initial value of an encoding parameter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • H04N19/463—Embedding additional information in the video signal during the compression process by compressing encoding parameters before transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/597—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding specially adapted for multi-view video sequence encoding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2213/00—Details of stereoscopic systems
    • H04N2213/003—Aspects relating to the "2D+depth" image format

Definitions

  • the following description relates to an encoding / decoding apparatus and method for a 3D image.
  • the 3D image is composed of a color image and a depth image corresponding to 3D data.
  • the depth image is supplementary information (supplement data) for generating a 3D multi-view image.
  • color images contain more image information than depth images. Therefore, accurate motion prediction is possible through color images rather than depth images.
  • An encoding apparatus includes a comparator configured to compare block sizes of a color image and a depth image; A sharing unit configured to share encoding information of the color image as encoding information of the depth image based on the block size comparison result; And an encoder which encodes the depth image by using the shared encoding information.
  • the sharing unit may share encoding information of a color image corresponding to each block of the depth image as encoding information of the depth image.
  • the sharing unit assumes that the block of the depth image is divided into the same size as the block of the color image, and corresponds to the block of the depth image.
  • the encoding information of the color image may be shared as the encoding information of the depth image.
  • the sharing unit may share the encoded information of the color image as encoding information of the depth image.
  • the encoding apparatus further includes a mode determiner configured to determine whether to apply coded information sharing and a coded information sharing mode by using a flag, wherein the sharer is configured to determine the coded information of the color image based on the coded information sharing mode. It can be shared as encoded information.
  • the sharing unit may share encoding information of a block adjacent to the block as encoding information of the depth image when there is at least one block of the color image that does not include encoding information encoded in an intra mode.
  • the sharing unit may share a predetermined value as encoding information of the depth image when there is at least one block of the color image that does not include encoding information encoded in an intra mode.
  • Decoding apparatus includes a mode determination unit for determining whether to apply the decoded information sharing and the decoding information sharing mode using a flag; A sharing unit configured to share decoding information of the color image as decoding information of the depth image based on the decoding information sharing mode; And a decoder which decodes the depth image by using the shared decoding information.
  • the sharing unit assumes that a block of the depth image is divided into the same size as a block of the color image based on the decoding information sharing mode, and decodes the decoding information of each color image corresponding to the block of the depth image. It can be shared as decoding information of the video.
  • the sharing unit may share the decoded information of the color image as the decoded information of the depth image based on the decoded information sharing mode.
  • An encoding method may include comparing block sizes of a color image and a depth image; Sharing encoding information of the color image as encoding information of the depth image based on the block size comparison result; And encoding the depth image by using the shared encoding information.
  • the step of sharing encoding information of the color image as encoding information of the depth image based on a result of the block size comparison may include: when the block size of the depth image is smaller than the block size of the color image, blocks of each depth image.
  • the encoding information of the color image corresponding to may be shared as the encoding information of the depth image.
  • the sharing of the encoding information of the color image as the encoding information of the depth image based on the result of the block size comparison may include: when the block size of the color image is smaller than the block size of the depth image, Assuming that the image is divided into the same size as the block of the color image, encoding information of each color image corresponding to the block of the depth image may be shared as encoding information of the depth image.
  • the step of sharing encoding information of the color image as encoding information of the depth image based on a result of the block size comparison may include encoding information of the color image when the block size of the color image is smaller than the block size of the depth image. It can be shared as the encoding information of the depth image.
  • the encoding method may further include determining whether to apply encoding information sharing and a encoding information sharing mode using a flag, and sharing encoding information of the color image as encoding information of the depth image based on a result of the block size comparison.
  • the step may share encoding information of the color image as encoding information of the depth image based on the encoding information sharing mode.
  • the sharing of the encoding information of the color image as the encoding information of the depth image based on the block size comparison result may include: when there is at least one block of the color image that does not include encoding information encoded in an intra mode.
  • the encoding information of the block adjacent to the block may be shared as the encoding information of the depth image.
  • the sharing of the encoding information of the color image as the encoding information of the depth image based on the block size comparison result may include: when there is at least one block of the color image that does not include encoding information encoded in an intra mode.
  • the predetermined value may be shared as encoding information of the depth image.
  • Decoding method comprises the steps of determining whether to apply the decoded information sharing and decoding information sharing mode using a flag; Sharing decoding information of the color image as decoding information of the depth image based on the decoding information sharing mode; And decoding the depth image by using the shared decoding information.
  • the sharing of the decoded information of the color image as the decoded information of the depth image based on the decoded information sharing mode may include: assuming that the block of the depth image is divided into the same size as the block of the color image; Decoding information of each color image corresponding to a block of may be shared as decoding information of the depth image.
  • the sharing of the decoding information of the color image as the decoding information of the depth image based on the decoding information sharing mode may share the decoding information of the color image as decoding information of the depth image.
  • FIG. 1 is a block diagram illustrating a detailed configuration of an encoding apparatus according to an embodiment.
  • FIG. 2 is a block diagram illustrating a detailed configuration of a decoding apparatus according to an embodiment.
  • 3A, 3B, and 3C are diagrams illustrating a divided state of a color image and a depth image, according to an exemplary embodiment.
  • FIG. 4 is a flowchart illustrating an encoding method according to an embodiment.
  • FIG. 5 is a flowchart illustrating a decoding method according to an embodiment.
  • FIG. 1 is a block diagram illustrating a detailed configuration of an encoding apparatus according to an embodiment.
  • the encoding apparatus 100 may include a comparator 110, a sharer 120, a mode determiner 130, and an encoder 140.
  • the encoding apparatus 100 may encode a depth image constituting a 3D image.
  • the encoded depth image may be transmitted to the decoding apparatus in the form of a bitstream.
  • the comparator 110 may compare the block sizes of the color image and the depth image.
  • the depth image may be split more than the color image, which may be the case where the block size of the depth image is smaller than the block size of the color image.
  • the color image may be divided more than the depth image, which may be the case where the block size of the color image is smaller than the block size of the depth image.
  • the comparison unit 110 may recognize whether the block size of the color image and the depth image belongs to any one of the aforementioned cases through the comparison.
  • the block may be a coding unit (CU) including an image.
  • the sharing unit 120 may share encoding information of the color image as encoding information of the depth image based on the block size comparison result.
  • the sharing unit 120 may share encoding information of the color image as encoding information of the depth image even when the block sizes of the color image and the depth image are not the same.
  • the sharing unit 120 may share the encoding information of the block of the color image as the encoding information of the block of the depth image.
  • the sharing unit 120 may perform a method of sharing encoding information of a color image as encoding information of a depth image based on the encoding information sharing mode determined by the mode determination unit 130. .
  • the sharing unit 120 may change a coding information sharing mode through a flag.
  • the sharing unit 120 may not apply encoding information sharing through a flag.
  • the encoding information is information capable of encoding a block of a corresponding depth image corresponding to a block of a color image, and may include a motion vector and mode information.
  • the motion vector may be a vector with respect to the time axis
  • the mode information may be information indicating a mode for sharing encoding information of a color image as encoding information of a depth image.
  • the mode determiner 130 may determine a mode for sharing encoding information. According to an embodiment, the mode determiner 130 may differently determine a method of sharing encoding information of a color image as encoding information of a depth image. For example, the mode determiner 130 may determine whether the encoded information sharing mode is applied and the type of the encoded information sharing mode through the flag. In addition, the mode determiner 130 may finally determine the encoding information sharing mode based on the bit rate-distortion cost (RDO) of the prediction error due to the mode application.
  • RDO bit rate-distortion cost
  • the flag may be data that may include additional additional information.
  • the flag may be 2-bit data.
  • the skip mode is applied.
  • the flag is '01'
  • the block size of the color image and the depth image is
  • the encoding information sharing mode is applied. If the flag is '10', the encoding information sharing mode is applied when the block size of the depth image is smaller than the block size of the color image.
  • the encoding information sharing mode when the size is smaller than the block size of the depth image may be applied.
  • the skip mode will be described later with reference to FIGS. 3A, 3B, and 3C.
  • the encoder 140 may encode the depth image by using the shared encoding information.
  • the encoding apparatus using such encoding information sharing may overcome the limitation due to the limited bandwidth by reducing the bit generation amount of the depth image.
  • FIG. 2 is a block diagram illustrating a detailed configuration of a decoding apparatus according to an embodiment.
  • the decoding apparatus 200 may include a mode determiner 210, a sharer 220, and a decoder 230. In addition, the decoding apparatus 200 may decode the encoded depth image.
  • the mode determiner 210 may determine a mode for sharing decryption information. According to an embodiment, the mode determiner 210 may differently determine a method of sharing the decoded information of the color image as the decoded information of the depth image. For example, the mode determiner 210 may determine whether to apply the decryption information sharing mode and the type of the decryption information sharing mode using the flag. As another example, the mode determiner 210 may determine whether the decoding information sharing mode is applied and the mode type using the signal information in the bitstream.
  • the decoding information is information capable of decoding a block of the corresponding depth image corresponding to the block of the color image, and may include motion vector and mode information.
  • the sharing unit 220 may change a method of sharing the decoded information of the color image as the decoded information of the depth image based on the decoded information sharing mode determined by the mode determiner 210. For example, the sharing unit 220 may change the decoding information sharing mode through the flag. Also, the sharing unit 220 may not apply decryption information sharing through a flag.
  • the decoder 230 may decode the depth image by using the shared decoding information.
  • 3A, 3B, and 3C are diagrams illustrating a divided state of a color image and a depth image, according to an exemplary embodiment.
  • the block size of the depth image may be smaller than the block size of the color image. This may mean that the depth image is divided more than the color image.
  • the encoding apparatus may share encoding information corresponding to blocks 312 to 315 of each depth image as encoding information of the depth image. For example, the encoding apparatus may share encoding information of a color image at the same position as the depth image.
  • the block size of the color image may be smaller than the block size of the depth image. This may mean that the color image is divided more than the depth image.
  • the encoding apparatus assumes that the block 325 of the depth image is divided into the same size as the blocks 321 to 324 of the color image, and encodes each encoding information corresponding to the block 325 of the depth image as encoding information of the depth image.
  • the encoding apparatus may assume that the depth image is also divided by the method of dividing the color image even if the depth image is not divided like the color image. Therefore, if the color image is not divided, it may be assumed that the depth image is not divided. If the color image is divided into four equal parts in the basic block, it may be assumed that the depth image is divided into four equal parts in the basic block. . Thereafter, the encoding apparatus may share encoding information of blocks 321 to 324 of each color image corresponding to block 325 of the depth image as encoding information of the depth image.
  • the encoding apparatus may share the encoded information of the color image as encoding information of the depth image regardless of the degree of division of the color image.
  • the encoding apparatus may set any one of encoding information of blocks 321 to 324 of the divided color image as a representative value. Subsequently, the encoding apparatus may share the representative value as encoding information of the depth image.
  • the encoding apparatus does not share the corresponding encoding information again, but instead may share data indicating that the same encoding information exists.
  • the data indicating that the same encoding information exists may be a flag indicating that the skip mode is present. This case is called a skip mode, and the skip mode may be a coded information sharing mode having the highest compression rate of coded information.
  • the encoding modes of the blocks 331 to 334 of the color image may not all be the same.
  • encoding modes of some blocks 331, 333 ⁇ 334 of the color image may be inter, and encoding modes of some blocks 332 may be intra.
  • the inter encoding mode may be a mode for encoding using one or two images of different times on the time axis.
  • the intra encoding mode may be a mode for encoding using neighboring pixels in the same image to be encoded.
  • the peripheral pixel may be an already encoded left or upper pixel of the corresponding pixel.
  • a block to which an intra encoding mode is applied may not include encoding information for inter prediction, such as a motion vector.
  • the intra encoding mode may be the same as the intra mode
  • the inter encoding mode may be the same as the inter mode.
  • the encoding apparatus may share encoding information of a block that does not include encoding information of the color image encoded in the intra mode and adjacent blocks as encoding information of the corresponding depth image.
  • the encoding apparatus may share the predetermined value as encoding information of the depth image corresponding to the block that does not include encoding information of the color image encoded in the intra mode.
  • the encoding apparatus may reduce the bit allocated to the entire encoding information sharing mode by deleting the encoding information sharing mode of the block that does not include the encoding information of the color image encoded in the intra mode.
  • Each of the aforementioned methods of sharing the encoded information may be designated as one encoded information sharing mode.
  • Such coding information sharing modes may be distinguished using a flag.
  • priority may be given based on a data value of a flag corresponding to each encoded information sharing mode.
  • coding information sharing may not be applied using a flag.
  • the skip mode is applied. If the flag is '01', the encoding information sharing mode is applied when the block size of the color image and the depth image is the same, and if the flag is '10'. The encoding information sharing mode is applied when the block size of the depth image is smaller than the block size of the color image. If the flag is '11', the encoding information sharing mode when the block size of the color image is smaller than the block size of the depth image is applied. Can be. In this case, the skip mode having the lowest data value '00' may be applied as a priority. If the skip mode cannot be applied, encoding information sharing modes corresponding to data values '01', '10', and '11' of the flag may be sequentially applied. This priority can be controlled by changing the data value of the flag.
  • FIG. 4 is a flowchart illustrating an encoding method according to an embodiment.
  • the encoding apparatus may compare block sizes of a color image and a depth image.
  • the encoding apparatus may recognize the relative block sizes of the color image and the depth image through comparison.
  • the encoding apparatus may determine whether to apply encoded information sharing and a encoded information sharing mode by using a flag. Such a flag has already been described in detail with reference to FIGS. 1 to 3.
  • the encoding apparatus may share encoding information of the color image as encoding information of the depth image based on the block size comparison result and the encoding information sharing mode.
  • the encoding apparatus may share encoding information of the color image as encoding information of the depth image even when the block sizes of the color image and the depth image are not the same.
  • the encoding information sharing mode has been described in detail with reference to FIGS. 3A, 3B, and 3C.
  • the encoding apparatus may encode the depth image using the shared encoding information.
  • FIG. 5 is a flowchart illustrating a decoding method according to an embodiment.
  • the decoding apparatus may determine whether the decoding information sharing mode is applied and the type of the decoding information sharing mode by using signal information in a flag or bitstream. For the flag, the content described with reference to FIGS. 1 to 3 may be applied as it is.
  • the decoding apparatus may share decoding information of the color image as decoding information of the depth image based on the decoding information sharing mode.
  • the decryption information sharing mode the contents described with reference to FIGS. 3A, 3B, and 3C may be applied.
  • the decoding apparatus may decode the depth image using the shared decoding information.
  • the apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components.
  • the devices and components described in the embodiments may be, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors, microcomputers, field programmable arrays (FPAs), It may be implemented using one or more general purpose or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions.
  • the processing device may execute an operating system (OS) and one or more software applications running on the operating system.
  • the processing device may also access, store, manipulate, process, and generate data in response to the execution of the software.
  • OS operating system
  • the processing device may also access, store, manipulate, process, and generate data in response to the execution of the software.
  • processing device includes a plurality of processing elements and / or a plurality of types of processing elements. It can be seen that it may include.
  • the processing device may include a plurality of processors or one processor and one controller.
  • other processing configurations are possible, such as parallel processors.
  • the software may include a computer program, code, instructions, or a combination of one or more of the above, and configure the processing device to operate as desired, or process it independently or collectively. You can command the device.
  • Software and / or data may be any type of machine, component, physical device, virtual equipment, computer storage medium or device in order to be interpreted by or to provide instructions or data to the processing device. Or may be permanently or temporarily embodied in a signal wave to be transmitted.
  • the software may be distributed over networked computer systems so that they may be stored or executed in a distributed manner.
  • Software and data may be stored on one or more computer readable recording media.
  • the method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.
  • the program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts.
  • Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks.
  • Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computing Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

L'invention concerne un appareil de codage/décodage et un procédé de codage/décodage qui utilise le partage d'informations de codage/décodage d'une image en couleurs. L'appareil de codage peut partager, si une taille de bloc de l'image en couleurs et la taille de bloc d'une image de profondeur ne sont pas les mêmes, les informations de codage de l'image en couleurs en tant qu'informations de codage de l'image de profondeur de façon à coder l'image de profondeur pertinente.
PCT/KR2013/008733 2012-09-28 2013-09-30 Appareil de codage/décodage et procédé de codage/décodage utilisant le partage d'informations de codage/décodage d'image en couleurs et d'image de profondeur Ceased WO2014051404A1 (fr)

Applications Claiming Priority (4)

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US201261707501P 2012-09-28 2012-09-28
US61/707,501 2012-09-28
KR10-2013-0112433 2013-09-23
KR1020130112433A KR20140043027A (ko) 2012-09-28 2013-09-23 컬러 영상과 깊이 영상의 부호화/복호화 정보 공유를 이용한 부호화/복호화 장치 및 방법

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