JP4277695B2 - Video data transmission / reception method - Google Patents

Description

  The present invention relates to a video data transmission / reception method for transmitting (transmitting / receiving) video data other than HDTV signal format on various transmission channels in HDTV format.

  Currently, the STPTE292M standard is used as a digital transmission system for HDTV signals. In this transmission standard, video data of the SMPTE 274M standard including 1125 scanning lines (1080 effective lines, 1920 effective horizontal pixels, frame frequency 30 / 1.001 Hz, interlaced operation 1080 / 60I system) is used. Can be transmitted.

On the other hand, the resolution of image display devices is also increasing, and image display devices capable of displaying, for example, the number of effective pixels in horizontal 2048 × vertical 1536 have also appeared (for example, see Non-Patent Document 1).
Full HDTV compatible super resolution projector, “Journal of the Institute of Image Information and Television Engineers” Vol. 56, no. 8, pp. 1216-1218 JP 2000-188737 A

  However, the format handled by the SMPTE292M standard is, for example, as shown in FIG. 13, a Y signal with a sampling rate of 74.25 MHz (or 74.25 / 1.001 MHz), a sampling rate of 37.125 MHz (or 37.125 / 1.01 MHz) Pb and Pr signal format standard HDTV signals, so-called 4: 2: 2 format video data. For this reason, there is a problem that RGB 4: 4: 4 format video data such as a graphic image displayed by a projector or video data in a format that does not match the number of pixels of a standard HDTV cannot be transmitted as it is. . Incidentally, in order to transmit video data other than the standard HDTV signal as described above, a transmission path designed in accordance with a dedicated transmission standard is required, and it is difficult to configure a digital transmission path at a low cost.

  An object of the present invention is to provide a video data transmission / reception method capable of transmitting video data other than a standard HDTV signal using an existing transmission line such as the SMPTE292M standard.

In order to solve the above problems, the present invention provides a video data transmitting method and a video data receiving method having the following configurations (1) to (5).
(1) The first video data having the first horizontal effective pixel number of 3 channels composed of 3 signals of 4: 4: 4 format is converted to the second channel of 2 channels composed of 3 signals of 4: 2: 2 format. A video data transmission method for transmitting using a transmission path for transmitting second video data having a horizontal effective pixel number,
The first horizontal effective pixel number is more than 2/3 of the second horizontal effective pixel number;
When the two channels of the second video data are made into one system, the decimal point of the value obtained by (the first horizontal effective pixel number) / (the second horizontal effective pixel number) × 3/2 is obtained. Set the rounded-up integer value as the number of systems of multiple systems of the transmission path,
By assigning the first number of pixels in each channel of the first video data to a second number of pixels smaller than the first number of pixels in each channel of the second video data, Converting video data into the second video data of the plurality of systems,
In each of the plurality of systems, the second video data is mapped into an effective image area defined in a 4: 2: 2 format,
A video data transmission method comprising serializing the second video data of each of the plurality of mapped systems and transmitting the serialized data through the transmission lines of the plurality of systems.
(2) The video data transmission according to (1), wherein the number of systems of the plurality of systems is 2, the first pixel number is 4 pixels, and the second pixel number is 3 pixels. Method.
(3) The video data transmission according to (1), wherein the number of systems of the plurality of systems is 4, the first pixel number is 8 pixels, and the second pixel number is 3 pixels. Method.
(4) The number of horizontal effective pixels of the effective image area is different from the number of horizontal effective pixels of the second video data,
(1) When mapping the second video data in the effective image area, the data sequence corresponding to each scanning line of the second video data is continuously mapped head-to-head (1) The video data transmission method according to any one of (1) to (3).
(5) A video data reception method for receiving second video data of each of a plurality of systems transmitted by the video data transmission method according to any one of (1) to (4) above,
Each of the plurality of systems decodes the second video data of 2 channels,
Mapping the decoded second video data into an effective pixel area defined in a 4: 2: 2 format;
Based on the mapped data, take out the second video data of the plurality of systems,
The first video data is restored by assigning the second number of pixels in each channel of the extracted second video data to the first number of pixels in each channel of the first video data. And a video data receiving method.

  As a preferable mode, the 4: 4: 4 format 3 signal and the 4: 2: 2 format 3 signal are respectively converted into RGB 3 signal, Y, Pr, Pb 3 signal, or Y, RY. , BY signals.

According to the present invention, even video data in RGB 4: 4: 4 format, such as a graphic image displayed by a projector, or video data in a format that does not match the number of pixels of standard HDTV, can be used in the existing SMPTE292M standard. It can be transmitted by a transmission line. Even when video data other than the standard HDTV signal is transmitted, it is not necessary to prepare a dedicated transmission path, and an SMPTE292M standard encoder or decoder that is widely used at present can be used. Can be configured.

  Hereinafter, an embodiment in which the video data transmission / reception method according to the present invention is applied to video data transmission from a playback device (transmission side) such as a VTR to a display device (reception side) such as a projector will be described. Here, only the data transfer part, which is a characteristic part of the invention, is illustrated, and illustration and description of other parts are omitted.

[Embodiment 1]
In the first embodiment, the SMPTE292M transmission standard is applied to video data having a horizontal effective pixel number of 1280, a vertical effective pixel number of 1024, and a frame frequency of 24 Hz as an RGB 4: 4: 4 graphics format. The case of using will be described.

  FIG. 1 is a block diagram showing a circuit configuration for carrying out the video data transmitting / receiving method according to the first embodiment.

  As shown in FIG. 1, the transmission system 100 provided in the output stage on the transmission side includes a data conversion unit 101 and an encoder 102. The reception system 200 provided in the input stage on the reception side includes a decoder 201 and a data conversion unit 202. Further, the encoder 102 and the decoder 201 are connected by the transmission line 10 of the SMPTE292M transmission standard.

  In the transmission system 100, the original video data as shown in FIG. The original video data is 3-channel video data composed of 10-bit RGB signals, and is configured in a 4: 4: 4 format. FIG. 2 shows a data string in one effective horizontal period. The data conversion unit 101 allocates data for two pixels of the original video data to three pixels in the 4: 2: 2 format that is an existing standard HDTV signal, and has two channels as shown in FIG. 2 (below). Convert to video data. The original video data has three channels and has a number of 1280 pixels (30 bits) in one effective horizontal period, but the converted two-channel video data has two channels and has a number of 1920 pixels in one effective horizontal period.

  The encoder 102 maps the video data of the two channels in the effective image area of the SMPTEM standard as shown in FIG. 3, and creates video data for transmission by adding a SAV, an EAV code, a blanking period, and the like. The horizontal 1920 × vertical 1024 video data occupies the range of horizontal lines 42 to 1066 in the horizontal 2750 × vertical 1125 area to be mapped. Thus, since the total number of pixels after mapping is 2750 × vertical 1125 and the frame frequency is 24 Hz, the sampling frequency is the same as 74.25 MHz of the standard HDTV signal. In addition, it matches the 1080 / 24p format in the SMPTEM standard except for the difference in the number of vertical effective pixels. The encoder 102 further serializes video data for transmission consisting of 10 bits and 2 channels, and transmits the serialized video data via the transmission line 10 of the SMPTE292M standard.

  In the receiving system 200, the original video data is restored in the reverse order to that of the transmitting system 100. First, the decoder 201 decodes the transmitted data into video data for transmission consisting of 2 × 10 bits and 2 channels, and further maps the decoded data in the effective image area of the SMPTEM standard shown in FIG. Then, the SAV, EAV code, blanking period, and the like are removed, and the video data including two channels as shown in FIG.

  The data conversion unit 202 assigns the data for the three pixels of the extracted video data to two pixels in the 4: 4: 4 format, and the original 4: 4: 4 as shown in FIG. 2 (upper figure). Restore the format 3 channel video data (original video data).

  Therefore, according to the first embodiment, RGB 4: 4: 4 format video data that does not correspond to the standard HDTV signal format can be transmitted using the transmission path according to the existing SMPTE292M standard. .

[Embodiment 2]
In the second embodiment, the RGB 4: 4: 4 graphics format includes 2048 horizontal effective pixels and 1536 vertical effective pixels 1536, and a transmission path of SMPTE292M transmission standard for video data having a frame frequency of 24 Hz. The case of using will be described. In this example, the horizontal effective pixel count 2048 of the RGB 4: 4: 4 format video data is distributed to 2/2 of the horizontal effective pixel count 1536 of the 4: 2: 2 transmission path when the horizontal effective pixel count 2048 described later is distributed. Since the number exceeds 3, two transmission lines are arranged.

  FIG. 4 is a block diagram showing a circuit configuration for carrying out the video data transmission / reception method according to the second embodiment.

  As shown in FIG. 4, the transmission system 110 provided in the output stage on the transmission side includes a data conversion unit 111, an encoder 112-1, and the same 112-2. The reception system 210 provided at the input stage on the reception side includes a decoder 211-1, 211-2, and a data conversion unit 212. The encoder 112-1 and the decoder 211-1 are connected by a transmission line 11 of the SMPTE 292M transmission standard, and the encoder 112-2 and the decoder 211-2 are connected by a transmission line 12 of the SMPTE 292M transmission standard. Yes.

  In the transmission system 110, the original video data as shown in FIG. The original video data is 3-channel video data composed of 10-bit RGB signals, and is configured in a 4: 4: 4 format. FIG. 5 shows a data string in one effective horizontal period. The data conversion unit 111 allocates the data of 4 pixels of the original video data to 3 pixels of 4: 2: 2 format which is an existing standard HDTV signal, and has 4 channels as shown in FIG. Convert to video data. Here, the pixels included in the original video data are even pixels R0, R2, R4,..., G0, G2, G4,..., B0, B2, B4,. , R5,..., G1, G3, G5,..., B1, B3, B5, and so on, each of which is assigned to 2 channels (even2ch, odd2ch) to form 4-channel video data. That is, by assigning data for 2 pixels to 3 pixels in one channel among the data for 4 pixels included in the original video data, the data for 4 pixels is converted into 3 pixels in 4: 2: 2 format. Will be assigned. As a result, in the RGB 4: 4: 4 format, video data of 3 channels with 2048 horizontal effective pixels is converted to video data of 4 channels with 1536 horizontal effective pixels.

  The encoders 112-1 and 112-2 combine the 4-channel video data shown in FIG. 5 (below) every two channels and map them into the effective image area of the SMPTE standard, respectively, and SAV, EAV code, and blanking. Video data for transmission is created by adding a period or the like. Here, in the SMPTE 274M standard, there is no standard signal that satisfies the number of vertical effective pixels 1536, but the total number of pixels in the video data for transmission is set to horizontal 1875 × vertical 1650 (or horizontal 1650 × vertical 1875) as shown in FIG. ) And the number of effective pixels is horizontal 1536 × vertical 1536, the sampling frequency is 74.25 MHz. Therefore, an SMPTE292M encoder or decoder can be used. The encoders 112-1 and 112-2 further serialize video data for transmission consisting of 2 × 10 bits and 2 channels, respectively, and transmit them via transmission lines 11 and 12 of the SMPTE292M standard.

  In the reception system 210, the original video data is restored in the reverse order to that of the transmission system 110. First, the decoders 211-1 and 211-2 decode the transmitted data into video data for transmission consisting of 2 × 10 bits and 2 channels, respectively, and further, the decoded data is shown in FIG. By mapping within the effective image area of the standard and removing the SAV, EAV code, blanking period, etc., it is extracted as video data consisting of 10 bits and 4 channels as shown in FIG.

  The data conversion unit 212 allocates the data for three pixels of the extracted video data to four pixels in the 4: 4: 4 format, and the original 4: 4: 4 as shown in FIG. 5 (upper figure). Restore the format to 10-bit, 3-channel video data (original video data).

  Therefore, according to the second embodiment, even for video data in which the number of effective pixels is composed of horizontal 2048 × vertical 1536, data transmission can be performed by using two transmission lines according to the existing SMPTE292M standard.

[Embodiment 3]
In the third embodiment, as a graphics format of RGB 4: 4: 4, a transmission path of the SMPTE292M transmission standard is configured for video data having a horizontal effective pixel count of 2048 and a vertical effective pixel count of 1536 and a frame frequency of 24 Hz. The case of using will be described. Also in this example, two transmission lines are arranged as in the embodiment.

  FIG. 7 is a block diagram showing a circuit configuration for carrying out the video data transmission / reception method according to the third embodiment.

As shown in FIG. 7, the transmission system 120 provided in the output stage on the transmission side includes a data converter 121, an encoder 122-1, and the same 122-2. The reception system 220 provided in the input stage on the reception side includes decoders 221-1 and 221-2 and a data conversion unit 222. Further, between the encoder 122-1 and the decoder 221-1 are connected by a transmission line 13 of SMPTE292M transmission standard between the encoder 122-2 and the decoder 221-2 are connected by the transmission path 1 4 SMPTE292M transmission standard ing.

  In the transmission system 120, the original video data as shown in FIG. 5 (upper diagram) is input to the data converter 121 as in the case of the second embodiment. The original video data is 3-channel video data composed of 10-bit RGB signals, and is configured in a 4: 4: 4 format. The data conversion unit 121 allocates the data for 4 pixels of the original video data to 3 pixels in the 4: 2: 2 format which is an existing standard HDTV signal, and has 4 channels as shown in FIG. Convert to video data. As a result, in the RGB 4: 4: 4 format, video data of 3 channels with 2048 horizontal effective pixels is converted to video data of 4 channels with 1536 horizontal effective pixels.

When this video data is serialized and transmitted, 1536 (horizontal) × 1536 (vertical) × 24 (Hz) × 10 (bit) × 4 (channel) = about 2.265 Gbps. Therefore, in order to transmit the video data to serialize the SMPTE292M standard equivalent transmission rate 1.485 Gbps, divides the four channels into One not a 2-channel, two transmission lines 13 and transmitted using the same 14 . However, the number of effective pixels (horizontal) 1536 × (vertical) 1536 is larger than 1920 × 1080 defined by SMPTE274M as a standard HDTV signal (so-called 1080 × 24p) with a frame frequency of 24 Hz. However, if a blanking period is used, it is possible to assign the number of effective samples. In SMPTE 292M, two 10-bit channels Y and C can be transmitted, so if there are two SMPTE 292M transmission lines, the number of effective pixels (horizontal) 1536 × (vertical) 1536 can be transmitted.

  Therefore, in the encoders 122-1 and 122-2, as shown in FIG. 8, among the total number of pixels in the 1080 × 24p format, horizontal 2112 × vertical 1118 is mapped as an effective area. At this time, since the horizontal 2112 × vertical 1118 which is the number of pixels in the effective area is larger than 1536 × 1536, the data strings # 1, # 2,. When mapping is performed while filling the data without gaps in this way, the last 1118 line has a blank space of 1920 pixels as a fraction, but here, a fixed level (such as 040h of the pedestal level, such as pedestal level) is shown. ) Is inserted. Also, video data for transmission is created by adding a SAV, an EAV code, a blanking period, and the like.

  Further, the encoders 122-1 and 122-2 serialize video data for transmission consisting of 2 × 10 bits and 2 channels, respectively, and transmit them via the transmission lines 13 and 14 of the SMPTE292M standard.

  The reception system 220 restores the original video data in the reverse order to that of the transmission system 120. First, the decoders 211-1 and 211-2 decode the transmitted data into video data for transmission consisting of 2 × 10 bits and 2 channels, respectively, and the decoded data is shown in FIG. 8. As shown in FIG. 5 (below), mapping is performed within the effective image area of horizontal 2112 × vertical 1118, and a data string is cut out every 1536 pixels, and SAV, EAV code, blanking period, etc. are removed. Extracted as video data consisting of 4 bits.

  The data conversion unit 222 allocates the data for the three pixels of the extracted video data to four pixels in the 4: 4: 4 format, and the original 4: 4: 4 as shown in FIG. 5 (upper figure). Restore the format to 10-bit, 3-channel video data (original video data).

  When the number of pixels is the same and the frame frequency is 25 Hz, mapping is performed on a standard HDTV signal (so-called 1080 / 25p) having a frame frequency of 25 Hz. In this case, the total number of pixels including horizontal blanking in FIG. 8 (right figure) is not 2750 but 2640. Other than that, it can be realized in exactly the same way.

  When the number of pixels is the same and the frame frequency is 30 Hz, the frame frequency is mapped to a standard HDTV signal (so-called 1080 / 30p) having a frame frequency of 30 Hz. In this case, the total number of pixels including horizontal blanking in FIG. 8 (right figure) is 2200 instead of 2750. Other than that, it can be realized in exactly the same way.

The number of pixels in the effective area is not limited to horizontal 2112 × vertical 1118. The required conditions are H (horizontal effective pixel number) and V (vertical effective pixel number) satisfying 1536 × 1536 (2048 × 1536/4) ≦ H × V, and H ≦ 2188 (when 30 Hz), V ≦ 1125. Here, 2188 is a value obtained by subtracting EAV, SAV, LN (line number) and CRC (cycle redundancy code) from the total number of horizontal pixels 2200.

  Therefore, according to the third embodiment, even for video data in which the number of effective pixels is horizontal 2048 × vertical 1536, data transmission can be performed by using two transmission paths according to the existing SMPTE292M standard.

[Embodiment 4]
In the fourth embodiment, the RGB 4: 4: 4 graphics format is composed of the number of horizontal effective pixels 2048 and the number of vertical effective pixels 1536, and the frame frequency is 60 Hz for video data of the SMPTE292M transmission standard. A case where a transmission line is used will be described.

  FIG. 9 is a block diagram showing a circuit configuration for carrying out the video data transmission / reception method according to the fourth embodiment.

  As shown in FIG. 9, the transmission system 130 provided in the output stage on the transmission side includes a data conversion unit 131, an encoder 132-1, 132-2, 132-3, and 132-4. The receiving system 230 provided at the input stage on the receiving side includes a decoder 231-1, 231-2, 231-3, 231-4, and a data converter 232. The encoder 132-1 and the decoder 231-1 are connected by the transmission line 15 of the SMPTE292M transmission standard, and the encoder 132-2 and the decoder 231-2 are connected by the transmission line 16 of the SMPTE292M transmission standard. Yes. Further, the encoder 132-3 and the decoder 231-3 are connected by the transmission line 17 of the SMPTE292M transmission standard, and the encoder 132-4 and the decoder 231-4 are connected by the transmission line 18 of the SMPTE292M transmission standard. Yes.

  In the transmission system 130, the original video data as shown in FIG. 10 (upper figure) is input to the data converter 131 as in the second embodiment. The original video data is 3-channel video data composed of 10-bit RGB signals, and is configured in a 4: 4: 4 format. However, in this embodiment, a standard HDTV signal (so-called 1080 / 60i) with an interlace field frequency of 60 Hz is used. In this case, the total number of lines per field is 1125/2, and transmission is not possible using the two-line transmission paths of the SMPTE292M transmission standard as shown in the third embodiment. Therefore, the data of 8 pixels of the original video data is allocated to 3 pixels of 4: 2: 2 format which is an existing standard HDTV signal, and A phase, B phase, C as shown in FIG. It is converted into 8-channel video data consisting of phase and D phase (2 channels each). As a result, in the RGB 4: 4: 4 format, video data of 3 channels with 2048 horizontal effective pixels is converted to video data of 8 channels with 768 horizontal effective pixels.

When this video data is serialized and transmitted, 768 (horizontal) × 1536 (vertical) × 60 (Hz) × 10 (bit) × 8 (channel) = approximately 5.662 Gbps. Therefore, in order to transmit the video data to serialize the SMPTE292M standard equivalent transmission rate 1.485 Gbps, to divide the 8 channels One not a 2-channel, is transmitted using four transmission lines 15-18.

  Each of the encoders 132-1 to 132-4 maps 768 × 1536 data for the 1080 / 60i format, as shown in FIG. That is, in the 1080 / 60i format in the SMPTE 274M standard, it is defined by the frame structure. Therefore, an effective area of horizontal 2112 × vertical 559 lines is created in each of the first field and the second field, and 768 × 1536 data is mapped to this. To do. Also in this case, the data strings # 1, # 2,. Also in this case, the last 1118 line has a blank space of 1920 pixels as a fraction, but a fixed level (such as pedestal level 040h) is inserted as in the third embodiment.

  In the encoders 132-1 to 132-4, video data for transmission consisting of 2 × 10 bits and 4 channels, which are mapped as shown in FIG. 11 (right figure), are serialized, and the transmission lines 15 to SMPTE292M standard are transmitted. 18 is transmitted.

  In the receiving system 230, the original video data is restored in the reverse order to that of the transmitting system 130. First, the decoders 231-1 to 231-4 decode the transmitted data into video data for transmission consisting of 2 × 10 bits and 4 channels, respectively, and the decoded data is shown in FIG. 11. As shown in FIG. 10 (below), mapping is performed within the effective image area of horizontal 2112 × vertical 559, and a data string is cut out from each area for every 1536 pixels and the SAV, EAV code, blanking period, etc. are removed. As shown, it is extracted as video data consisting of 2 × 10 bits and 8 channels.

  The data conversion unit 232 allocates the data for the extracted three pixels of the video data to four pixels in the 4: 4: 4 format, and the original 4: 4: 4 as shown in FIG. 10 (upper figure). Restore the format to 10-bit, 3-channel video data (original video data).

  When the number of pixels is the same and the frame frequency is 50 Hz or 48 Hz, mapping is performed to a standard HDTV signal (so-called 1080 / 50i, 1080 / 24sf) having a field frequency of 50 Hz or 48 Hz. In this case, the total number of pixels including the horizontal blanking period in FIG. 11 (right figure) is not 2200, 2640 in the case of 50 Hz, and 2750 in the case of 48 Hz. Other than that, it can be realized in exactly the same way.

  In the third and fourth embodiments, when the data strings # 1, # 2,... Corresponding to the respective scanning lines of the vertical 1536 are sequentially mapped with heading, a blank portion corresponding to 1920 pixels generated in the last 1118th line. Although an example in which a fixed level is inserted is shown in FIG. 5, additional data for controlling the display device may be inserted in this blank portion. The additional data is information relating to video content such as color management data such as color temperature and chromaticity point. By inserting such additional data, even if a playback device such as a projector (a transmission system is incorporated) and a display device (a reception system is incorporated) are separated from each other, depending on the video content Color management can be performed automatically. FIG. 12 shows an example in which additional data is inserted in place of the fixed level in the fourth embodiment.

  As additional data, identification data of a plurality of transmission paths can be used. By adding such identification data, it is possible to prevent a user from connecting a cable incorrectly. In this case, the receiving playback device that has received the identification data displays a message indicating whether the connection is incorrect or not, and the receiving playback device automatically replaces the data to reproduce an accurate image. It is possible to take measures such as However, the data of 000h to 003h and 3FCh to 3FFh, for which transmission is prohibited by SMPTE292M, is not used for the additional data.

  In the first to fourth embodiments, the video data in the RGB 4: 4: 4 format is shown. However, the video data in the Y, Pr, Pb (or Y, RY, BY) 4: 4: 4 format is used. It can also be applied. For example, in FIG. 2 (upper diagram), R is Pr, G is Y, and B is Pb.

  In the first to fourth embodiments, data mapping is performed in the encoder or decoder. However, a mapping unit including a memory may be arranged in the preceding stage of the encoder and the subsequent stage of the decoder.

1 is a block diagram showing a circuit configuration for implementing a video data transmission / reception method according to Embodiment 1. FIG. FIG. 3 is an explanatory diagram showing original video data and converted video data in the first embodiment. FIG. 3 is an explanatory diagram illustrating video data mapping in the first embodiment. FIG. 4 is a block diagram showing a circuit configuration for implementing a video data transmission / reception method according to a second embodiment. Explanatory drawing which shows the original video data and converted video data in Embodiment 2. FIG. Explanatory drawing which shows the mapping of the video data in Embodiment 2. FIG. FIG. 9 is a block diagram showing a circuit configuration for implementing a video data transmission / reception method according to the third embodiment. Explanatory drawing which shows the mapping of the video data in Embodiment 3. FIG. FIG. 5 is a block diagram showing a circuit configuration for implementing a video data transmission / reception method according to Embodiment 4; Explanatory drawing which shows the original video data and converted video data in Embodiment 4. FIG. Explanatory drawing which shows the mapping of the video data in Embodiment 4. FIG. Explanatory drawing which shows the mapping of the video data which inserted additional data in Embodiment 3 and 4. FIG. Explanatory drawing which shows the video data of 4: 2: 2 format handled by the SMPTE292M standard.

Explanation of symbols

101, 111, 121, 131: Data converter (transmission system)
202, 212, 222, 232: Data converter (reception system)
102, 112-1, 112-2, 122-1, 122-2, 132-1 to 132-4: Encoders 2011, 211-1, 211-2, 221-1, 221-2, 232-1 to 232 -4: Decoder

Claims (5)

4: The first video data having the first horizontal effective pixel number of three channels composed of three signals in 4: 4 format is converted into the second horizontal effective pixel of two channels composed of three signals in 4: 2: 2 format. a video data transmit method for transmitting using a transmission line for transmitting the second image data having a number,
The first horizontal effective pixel number is more than 2/3 of the second horizontal effective pixel number;
When the two channels of the second video data are made into one system, the decimal point of the value obtained by (the first horizontal effective pixel number) / (the second horizontal effective pixel number) × 3/2 is obtained. Set the rounded-up integer value as the number of systems of multiple systems of the transmission path,
By assigning the first number of pixels in each channel of the first video data to a second number of pixels smaller than the first number of pixels in each channel of the second video data, Is converted into the second video data of the plurality of systems,
In each of the plurality of systems, the second video data is mapped into an effective image area defined in a 4: 2: 2 format,
Mapped the plurality of systems video data transmit wherein the <br/> transmitting each of the second video data by the transmission path by serializing the plurality of channels. It said plurality of lines number of lines is two, the first number of pixels is four pixels, the image data transmit method according to claim 1, wherein the second number of pixels is three pixels. Said plurality of lines number of lines is four, the first number of pixels is eight pixels, the video data transmit method according to claim 1, wherein the second number of pixels is three pixels. The number of horizontal effective pixels of the effective image area is different from the number of horizontal effective pixels of the second video data,
2. The data sequence corresponding to each scanning line of the second video data is sequentially mapped head-to-head in order when mapping the second video data in the effective image area. to the video data transmit method according to any one of the three. A video data receiving method for receiving second video data of each of a plurality of systems transmitted by the video data transmitting method according to any one of claims 1 to 4,
Each of the plurality of systems decodes the second video data of 2 channels,
Mapping the decoded second video data into an effective pixel area defined in a 4: 2: 2 format;
Based on the mapped data, take out the second video data of the plurality of systems,
The first video data is restored by assigning the second number of pixels in each channel of the extracted second video data to the first number of pixels in each channel of the first video data. And a video data receiving method.

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