JP2013115454A - Video transmitting device, video receiving device, video transmitting method, and video receiving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that it is not considered to transmit video information reduced in deterioration in picture quality that a user feels in any prior-art document.SOLUTION: A video transmitting device which transmits video information to a video receiving device includes a compressing section which compresses the video information and a transmitting section which transmits the video information compressed by the compressing section, and is characterized in controlling the compressing section and transmitting section based upon a display state of the video information at the video receiving device.

Description

  The technical field relates to transmission and reception of video information.

In the above technical field, Patent Document 1 has a problem that “a video signal having a desired bit rate can be satisfactorily transmitted within the transmission bit rate of the transmission path” (see Patent Document 1 [0009]). As a solution, "a video signal output unit that outputs an uncompressed video signal to be transmitted and a compression method information acquisition unit that acquires information indicating a compression method that can be supported by the receiving device from a receiving device via a transmission path" And a compressed video obtained by subjecting the uncompressed video signal output from the video signal output unit to a compression method corresponding to the compression method indicated by the compression method information acquired by the compression method information acquisition unit. A video signal compression unit for outputting a signal, a video signal selection unit for selecting an uncompressed video signal output from the video signal output unit or a compressed video signal output from the video signal compression unit, A video signal transmission unit that transmits the video signal selected by the video signal selection unit to a receiving device via a wired or wireless transmission path, and a transmission control unit that controls operations of the video signal compression unit and the video signal selection unit And a compression information supply unit that supplies control information of the video signal compression unit and the video signal selection unit by the transmission control unit to the reception device via the transmission path ”(Patent Document 1 [0010] ) Is described.

  Further, Patent Document 2 has a problem of “providing an image processing method and an image processing apparatus with reduced power consumption” (see Patent Document 2 [0007]). In the image processing method of transmitting from the first image processing unit to the second image processing unit in accordance with the transmission clock, the first image processing unit compresses the digital image data, and the second image processing unit When the compressed digital image data is decompressed and the digital image data generated by compressing the digital image data by the first image processing unit is not required to be transmitted, the transmission clock is stopped and intermittently transmitted. The digital image data is transmitted to "(refer to the claims of Patent Document 1).

JP2009-213110 JP2010-130391

  However, none of the prior art documents considers transmission of video information with reduced image quality degradation felt by the user.

In order to solve the above problems, for example, the configuration described in the claims is adopted.
The present application includes a plurality of means for solving the above-described problems. For example, in a video transmission device that transmits video information to a video reception device, the compression unit compresses the video information and the compression unit compresses the video information. A transmission unit that transmits video information, and controls the compression unit and the transmission unit based on a display state of the video information in the video reception device.

  According to the above means, it is possible to transmit video information with reduced image quality degradation felt by the user.

It is a figure which shows the structure of a video transmission apparatus. It is a figure which shows the structure of a video receiver. It is a figure which shows the display state of the full screen in an image | video display part. It is a figure which shows the display state of the small screen in a video display part. It is a figure which shows the display state of the small screen in a video display part. It is a figure which shows the display state which the subscreen is hidden in the image | video display part. It is an example of presentation of the multichannel display state in VendorSpecificDataBlock in E-EDID.

  FIG. 1 is a diagram illustrating a configuration of a video transmission apparatus according to the present embodiment. 100 is a video transmission apparatus, 101 is a tuner, 102 is a Demux unit, 103 is an audio decoder unit, 105 is an Ethernet I / F unit, 106 is a memory, 107 is a storage unit, 108 is a Remux unit, 109 is a transcoder unit, 110 Is an audio processing unit, 111 is a video processing unit, 112 is a compression unit, 113 is an HDMI transmission unit, 114 is a control unit, and 115 is a transmission path sent from the HDMI transmission unit to the HDMI receiver.

  A tuner 101 receives a broadcast signal and modulates the compressed digital signal. The demux unit 102 separates the digital signal input from the tuner 101 or the memory 106 into a video signal and an audio signal. The audio decoder 103 and the video decoder 104 decode the video and audio separated by the Demux unit 102 and decode the video and audio data into the original signal. The Ethernet I / F 105 receives video and audio from an external device via Ethernet. “Ethernet” and “Ethernet” are registered trademarks.

  The memory 106 is a memory for storing data received from the Ethernet I / F 105 or video and audio data read from the storage unit 107. The Remux unit 108 reconstructs the video signal and audio signal separated by the Demux unit 102 as stream data. The transcoder 109 has a function of recompressing the input video and converting the compression rate. The audio processing unit 110 performs control to output the audio signal input from the audio decoder in accordance with the video signal. The video processing unit 111 has a function of scaling the video signal input from the video decoder to an arbitrary size, and the color difference signal is changed from the YCbCr4: 4: 4 format to the YCbCr4: 2: 2 or YCbCr4: 2: 0 format. It also has a function to convert.

  The compression unit 112 compresses the video signal input from the video processing unit 111.

  The HDMI transmission unit 113 converts the video and audio signals input from the compression unit 112 and the audio processing unit 110 into an HDMI signal and transmits the HDMI signal. It is also possible to transmit a stream signal input from the transcoder 109 and a compressed audio signal before decoding from the Demux unit 102. The control unit 114 controls each unit from the tuner 101 to the HDMI transmission unit 113. In this embodiment, the video signal input from the compression unit 112 is output from the HDMI transmission unit 113. However, the compression unit 112 does not perform compression, and an uncompressed video signal can be output from the HDMI transmission unit 113. It is.

  FIG. 2 is a diagram illustrating the configuration of the video reception device according to the present embodiment. 200 is a video receiving device, 201 is an HDMI receiving unit, 202 is an E-EDID storage unit, 203 is a tuner, 204 is a demux unit, 205 is an Ethernet I / F unit, 206 is a memory, 207 is a video decoder, and 208 is video processing 209 is a video output unit, 210 is an audio decoder, 211 is an audio processing unit, 212 is an audio output unit, 213 is a storage unit, and 214 is a control unit for controlling the storage unit 213 from the HDMI receiving unit 201. . Reference numeral 215 denotes a transmission path sent from the HDMI transmission unit to the HDMI receiver.

  The HDMI receiving unit 201 receives an HDMI signal from the video transmission device and outputs the HDMI signal to the video processing unit 208 and the audio processing unit 211. Here, the data is read from the E-EDID storage unit 202, and the result of reading the E-EDID data through the DDC line can be notified to the HDMI signal transmitter of the E-EDID information on the video receiving device side.

  The tuner 203 receives and demodulates the broadcast signal to obtain a compressed digital signal. The Demux unit 204 separates the digital signal input from the tuner 203 or the memory 206 into a video signal and an audio signal. The audio decoder 210 and the video decoder 207 decode the video and audio separated by the demux unit 204. The Ethernet I / F 205 receives video and audio from an external device via an Ethernet line. “Ethernet” and “Ethernet” are registered trademarks.

  The memory 206 is a memory for storing data received from the Ethernet I / F 205 or video and audio data read from the storage unit 213. The audio processing unit 210 performs control to output the audio signal input from the audio decoder or the audio signal input from the HDMI receiving unit 201 in accordance with the video signal. The video processing unit 208 has a function of scaling the video signal input from the video decoder or the video signal input from the HDMI receiving unit 201 to an arbitrary size, and also has a function of converting to an RGB pixel. In addition, it is possible to superimpose two video input from the video decoder and the HDMI receiving unit or to display them in parallel.

The video output unit 209 is a display device such as a panel that displays the video synthesized by the video processing unit 208.
The audio output unit 212 is a speaker or the like that outputs the audio processed by the audio processing unit 211. The control unit 214 controls each unit from the tuner 200 to the storage unit 213.

  FIG. 3 shows an example of a video display displayed by the video output unit 209. Reference numeral 300 denotes the display device itself, and reference numeral 301 denotes display information displayed on the display device. FIG. 3 shows an example in which one image is displayed on the entire screen of the display device. If the video device can display 4k x 2k high-definition video, you should not perform compression or color reduction processing that degrades the image quality as much as possible.

  However, in the case of transmitting a plurality of video signals such as multi-channel transmission, it is conceivable to display a small screen as indicated by 400 in FIG. 4 as a use case. In this case, the transmission amount may be reduced by compression or thinning out the number of pixels as necessary.

  In addition, as indicated by 601 in FIG. 6, when a plurality of video signals are transmitted but some of the video signals are not displayed, transmission of video signals that are not displayed is stopped. Can save the transmission bandwidth.

  As a method for determining whether or not there is a video signal that is transmitted but not displayed, the multi-channel display state is extended to the E-EDID storage unit 202 as the display state of the video output unit 209, for example. It is possible. As a result, the control unit 114 of the video transmission device 100 can know the display state of the destination video reception device via the HDMI reception unit 201 and the HDMI transmission unit 113.

  FIG. 7 shows an example of extension when the E-EDID of multi-channel information is extended.

  Multi_Channel_LEN is the size (Byte) of the subsequent multi-channel information. The following information per channel has the following data.

  Multi_Channel_Display_Horizontal_Size_X (lower 8 bits) is the lower 8 bits of the number of horizontal pixels currently being displayed.

  Multi_Channel_Display_Vertical_Size_X (lower 8 bits) is the lower 8 bits of the number of vertical pixels currently being displayed.

  Multi_Channel_Display_Horizontal_Size_X (upper 4 bits) is the upper 4 bits of the number of horizontal pixels currently being displayed.

  Multi_Channel_Display_Vertical_Size_X (upper 8 bits) is the upper 4 bits of the number of vertical pixels currently being displayed.

  Display_Enable_X indicates whether this channel is displaying or not.

  For example, when the video display state of the sending channel is 301 in FIG. 3, the control unit 114 performs lossless compression by the compression unit 112 while maintaining YCbCr4: 4: 4 because the correlation of pixels in the V direction is high. Only line-based compression (for example, RLE system, ZIP system) can be used, and transmission can be performed with a compression system in a range where image quality can be completely restored.

  On the other hand, in the case where the horizontal display size is less than half of the transmission signal format as indicated by 401 in FIG. 4, the video processing unit 111 thins out the color difference signal to YCbCr4: 2: 2 to transmit a transmission amount other than compression. Can be lowered.

  Further, if the original image cannot be recognized on a small-sized sub-screen having a sufficiently small size both horizontally and vertically as indicated by reference numeral 501 in FIG. 5, the video processor 111 thins out YCbCr4: 2: 0, and the transcoder 109 It is also possible to perform compression using an irreversible compression method (for example, MPEG2 / H.264).

  Also, not all multi-channels are displayed as indicated by 601 in FIG. 6, and some channels may not be displayed, so a flag indicating whether or not to display is added to E-EDID. It is also possible to control that transmission is not performed when not displayed.

  In the above description, an example in which E-EDID is used as means for determining the display state of the video has been described. However, instead of E-EDID, both display state communication by CEC, display state communication by Ethernet I / Fs 105 and 205, etc. It is possible to transmit the display state of the video receiving device 200 to the video transmitting device 100 by using the bidirectional communication function. Further, the display state of the video reception device 200 may be transmitted to the video transmission device 100 by other methods.

  In the first embodiment, the example in which the necessity of compression of the video signal transmitted from the video transmission device 100 and the change of the compression method are controlled based on the display state in the video reception device 200 has been described. The necessity of compression of the video signal to be transmitted and the change of the compression method may be controlled based on the device size, resolution, and the like.

  For example, when the resolution of the video signal transmitted by the video transmission device 100 is compared with the resolution of the video reception device 200 and the resolution of the video reception device 200 is lower than the resolution of the video signal to be transmitted, the video transmission device 100 receives the video signal. It is possible to compress the video signal to be transmitted in accordance with the resolution of the apparatus 200.

  As a method for the video transmitting apparatus 100 to determine the resolution of the video receiving apparatus 200, a method using the E-EDID described in the first embodiment, a method using CEC communication, or a method using Ethernet I / Fs 105 and 205 can be considered. Other methods may be used.

  When the video transmission apparatus 100 can determine the type of information to be transmitted, the necessity of compression of the information to be transmitted and the change of the compression method may be controlled based on the type of information to be transmitted.

  For example, if the information to be transmitted is text data, the reversible compression provides a high compression ratio, so it is conceivable to select the reversible compression. Further, in the case of live broadcasting or sports, it is assumed that the image is rough, so it is conceivable to select lossy compression. In the case of a movie, it is possible to select lossless compression because it is a built-in video.

  As a method of determining the type of information to be transmitted in the video transmission apparatus, for example, it is conceivable to refer to meta information added to the information to be transmitted, but other methods may be used.

  As described above, according to each of the embodiments described above, even when a plurality of video signals are transmitted from the video transmission device to the video reception device, it is possible to reduce the degradation of the image quality felt by the user. . Even when a high-band signal such as 4k × 2k is transmitted on a conventional physical layer equivalent to HDMI 1.4, it is possible to simultaneously transmit a plurality of channels while reducing image quality degradation felt by the user.

DESCRIPTION OF SYMBOLS 100 Video transmission apparatus 101 Tuner 102 Demux part 103 Audio | voice decoder 104 Video decoder 105 Ethernet I / F
106 Memory 107 Storage unit 108 Remux unit 109 Transcoder 110 Audio processing unit 111 Video processing unit 112 Compression unit 113 HDMI transmission unit 114 Control unit 115 HDMI transmission path 200 Video reception device 201 HDMI reception unit 202 E-EDID storage unit 203 Tuner 204 Demux part 205 Ethernet I / F
206 Memory 207 Video decoder 208 Video processing unit 209 Video output unit 210 Audio decoder 211 Audio processing unit 212 Audio output unit 213 Storage unit 214 Control unit 215 HDMI transmission path 300 Video display unit 301 in the full screen display state 301 Full screen display state 401 Child Screen display state 501 Sub-screen display state 601 Non-display sub-screen display

Claims (15)

A video transmission device for transmitting video information to a video reception device,
A video transmission apparatus that controls transmission of video information based on a display state of video information in the video reception apparatus. A video transmission device for transmitting video information to a video reception device,
A compression unit for compressing video information;
A transmission unit that transmits the video information compressed by the compression unit,
A video transmission device that controls the compression unit and the transmission unit based on a display state of video information in the video reception device. The video transmission device according to claim 2,
The transmission unit transmits a plurality of video information,
The video transmission apparatus characterized by controlling the said compression part and the said transmission part based on the display state for every said some video information in the said video reception apparatus. The video transmission device according to claim 2 or 3,
Video information that is not displayed in the video receiver is not transmitted from the transmitter. The video transmission device according to any one of claims 2 to 4,
A reading unit that reads information related to the video receiving device included in the video receiving device;
A video transmission device that determines a display state of the video reception device based on information about the video reception device read by the reading unit. The video transmission device according to any one of claims 2 to 4,
A communication unit that performs bidirectional communication with the video reception device;
A video transmission device that determines a display state of the video reception device based on communication with the video reception device via the communication unit. A video receiver that receives video information transmitted from a video transmitter,
A video receiving apparatus that transmits a display state of video information transmitted from the video transmitting apparatus to the video transmitting apparatus. A video receiver that receives video information transmitted from a video transmitter,
A receiver for receiving video information;
A processing unit for processing video information received by the receiving unit;
A display unit for displaying video information processed by the processing unit,
A video receiving apparatus that transmits a display state of video information on the display unit to the video transmitting apparatus. The video receiving device according to claim 8, wherein
The receiving unit receives a plurality of video information,
The display unit displays a plurality of video information,
A video receiving apparatus that transmits a display state of a plurality of pieces of video information on the display unit to the video transmitting apparatus. The video receiving device according to claim 8 or 9, wherein
A memory unit for holding information about the video receiving device;
The information related to the video receiving device held in the memory unit includes information indicating a display state of the video information on the display unit. The video receiving device according to claim 8 or 9, wherein
A communication unit that performs bidirectional communication with the video transmission device;
A video receiving apparatus that transmits a display state of video information on the display unit to the video transmitting apparatus through communication with the transmitting apparatus via the communication unit. A video transmission method for transmitting video information from a video transmission device to a video reception device,
A video transmission method, wherein transmission of video information is controlled based on a display state of video information in the video reception device. A video transmission method for transmitting video information from a video transmission device to a video reception device,
Compressing the video information;
Transmitting compressed video information, and
A video transmission method comprising: controlling compression of video information and transmission of video information based on a display state of video information in the video reception device. A video receiving method in which video information transmitted from a video transmitting device is received by a video receiving device,
A video receiving method, wherein the display state of the video information transmitted from the video transmitting device in the video receiving device is transmitted to the video transmitting device. A video receiving method in which video information transmitted from a video transmitting device is received by a video receiving device,
Receiving video information;
Processing the video information received by the receiver;
Displaying video information processed by the processing unit,
A video receiving method, wherein the display state of video information in the display of the video information is transmitted to the video transmitting device.

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