JP2010251818A - Video output device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video output device capable of further reducing the deterioration in composite quality of secondary video in compositing a part of a sub-image data to main image data. <P>SOLUTION: The video output device 1 connectable to a display device 3 includes: a CPU 14 for acquiring primary data; the CPU 14 for acquiring secondary data having a first region indicating a first image and a second region indicating a second image; the CPU 14 for detecting a boundary between the first region and the second region of the acquired secondary data; the CPU 14 for converting the secondary data based on the boundary detected by the CPU 14; the CPU 14 for compositing at least a part of the converted secondary data to the acquired primary data to generate composite image data; and the CPU 14 for outputting the composite image data to the display device 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a video output device such as a BD player.

  The BD player reads video data from a BD-ROM disc and outputs the read video data to a display device. The display device displays an image based on the input image data. Video data is recorded on the BD-ROM disc together with audio data and the like.

  Here, two types of video data called primary video and secondary video can be recorded on the BD-ROM disc (FIG. 15). The BD player can acquire these primary video and secondary video, synthesize these video signals, and output them as picture-in-picture (FIG. 16).

  In the video output device described in Patent Document 1, when the secondary video is synthesized with the primary video, the synthesis position of the secondary video can be designated with respect to the primary video.

  Further, claim 3 of Patent Document 1 describes that a secondary video is synthesized with a primary video by luma keying synthesis (hereinafter referred to as luma key synthesis).

JP 2007-259481 A

  By the way, if the secondary video is synthesized with the primary video by luma key synthesis after performing image processing on the secondary video, the quality of the secondary video is lowered. This will be specifically described below.

  The luma key composition is to replace a part of the secondary video with a part of the primary video based on the luminance information of the secondary video. For this reason, if image processing is performed on the secondary video before performing the luma key composition, information on the displayed area of the secondary video is generated based on information on the area that is not actually displayed. For example, assume that there is a secondary video as shown in FIG. In this secondary video, it is assumed that the area A is displayed and the area B is not displayed. In this case, when the enlargement process is performed on the secondary video, the information near the boundary between the region A and the region B is affected by the image data of the region B. That is, information near the boundary of the secondary video becomes a low-quality video by image processing.

  In particular, when the video formats (for example, resolution, pixel aspect ratio, aspect ratio) of the primary video and the secondary video are different, noise is likely to occur at the synthesis boundary. The pixel aspect ratio is the aspect ratio of one pixel constituting the screen, and the aspect ratio is the aspect ratio of the entire screen. This is because the video format of the primary video is different from the video format of the secondary video, so it is essential to match the video format of the secondary video with the video format of the primary video before performing the luma key composition. Because it becomes.

  This will be specifically described. The case where the pixel aspect ratios of the primary video and the secondary video are different will be described as an example. Assume that the primary video pixel is a square pixel and the secondary video pixel is a square pixel. When synthesizing the secondary video with the primary video, the video output device needs to match the aspect ratio of the secondary video pixels with the aspect ratio of the primary video pixels (FIG. 17). This is because if the secondary video is synthesized without matching the aspect ratio of the pixels of the primary video, the video of the secondary video synthesized with the primary video becomes an uncomfortable video.

  Thus, when the secondary video is matched with the primary video, image processing is performed on the secondary video. Therefore, as described above, the image processing is performed before the luma key composition, which causes a deterioration in the composite quality of the secondary video. Note that the primary video is an example of main image data, the secondary video is an example of sub image data, and the luma key composition is an example of partial composition for composing a part of sub image data to main image data.

  SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has an object to provide a video output device that can further reduce deterioration in the quality of sub image data when a part of sub image data is combined with main image data. And

  That is, the present invention is a video output device that can be connected to a display device, and includes a first acquisition unit that acquires main image data, a first region that indicates a first image, and a second region that indicates a second image. A second acquisition unit that acquires the sub image data, a boundary detection unit that detects a boundary between the first region and the second region of the acquired sub image data, and the sub image based on the detected boundary. Conversion means for converting data into image data different from the sub-image data, and at least a part of the converted sub-image data is combined with the acquired main image data to generate composite image data; Output means for outputting the composite image data to the display device.

  In this way, even when image processing is performed on the sub image data before combining a part of the sub image data with the main image data, the sub image data is based on the boundary between the first region and the second region. Sub image data can be converted. For example, image data of a part of the sub image data (for example, the first region) is not generated based on the sub image data of the second region.

  Preferably, the conversion means converts the sub image data of the first region acquired based on the detected boundary into image data having a larger number of pixels than the sub image data.

  Preferably, the conversion unit uses the sub image data of the first region according to a change in feature information of the sub image data of the first region and the second region at the detected boundary, It is selected whether to use the sub image data of the area and the second area, and the sub image data of the selected area is converted.

  Preferably, the boundary detection unit detects a boundary between the first region and the second region of the acquired sub-image data based on predetermined or arbitrary feature information.

  Preferably, the synthesizing unit synthesizes the image data of the first area of the converted sub image data with the acquired main image data to generate synthesized image data.

  Preferably, the converting means converts sub image data based on the image data of the first area, not based on the image data of the second area, and the synthesizing means converts the converted sub image. The image data of the first area of the data is combined with the acquired main image data to generate combined image data.

  According to the video output device of the present invention, when a part of the sub image data is combined with the main image data, it is possible to further reduce the deterioration of the composite quality of the sub image data.

FIG. 1 is a diagram illustrating a configuration example of a video output device. (Example 1) FIG. 2 is a functional block diagram of the CPU in the video output apparatus. (Example 1) FIG. 3 is a diagram showing an example of video data 1 (primary video) and video data 2 (secondary video). (Example 1) FIG. 4 is an explanatory diagram in which a part of the video data 2 is enlarged and displayed. (Example 1) FIG. 5 is an explanatory diagram showing an example in which video data 1 and video data 2 are combined. (Example 1) FIG. 6 is a flowchart showing the operation of the video output apparatus. (Example 1) FIG. 7 is an explanatory diagram showing the operation of the video repeater. (Example 1) FIG. 8 is an explanatory diagram showing the operation of the filter means. (Example 1) FIG. 9 is an explanatory diagram showing the operation of the video repeater. (Example 1) FIG. 10 is an explanatory diagram showing the operation of the conventional processing. (Example 1) FIG. 11 is a functional block diagram of the CPU in the video output apparatus. (Example 2) FIG. 12 is an explanatory diagram in which a part of the video data 2 is enlarged and displayed. (Example 2) FIG. 13 is a flowchart showing the operation of the video output apparatus. (Example 2) FIG. 14 is an enlarged view of a part of the image data. FIG. 15 is a diagram for explaining a primary picture and a secondary picture. FIG. 16 is a diagram illustrating an example of a picture-in-picture. FIG. 17 is a diagram for explaining enlargement of the secondary picture.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In the present embodiment, the video data 2 in FIG. 3 is combined with the luma key to generate the video data as shown in FIG. 5, so that the video data 2 is minimized.
Example 1
<1. Configuration>
<1-1. Configuration example of video output device>
FIG. 1 is a block diagram showing the configuration of the video output apparatus. When the player 1 receives an operation from the user by the remote controller 4, the player 1 acquires video data from the BD-ROM disc by the disc drive 2, processes it, and displays it on the display device 3. This will be specifically described below.

  The player 1 includes a flash memory 11, a buffer memory 12, a connector 13, a CPU 14, an infrared sensor 15, and the like. The flash memory 11 stores software for operating the player 1. The buffer memory 12 is a means for storing data necessary for decoding video data and processing such as enlargement / reduction. The buffer memory 12 can be realized by, for example, a DRAM.

  The connector 13 prepares data for connection to the display device 3. The connector 13 is connected to the disk drive 2 in a wired or wireless manner, and enables data transmission / reception with the disk drive 2.

  The CPU 14 is a part that performs the main operation of the player 1. The CPU 14 acquires BD-ROM video data from the disk drive 2 based on a user operation signal received by the infrared sensor 15 and processes it into a form that can be output to the display device 3. The configuration of the CPU 14 will be specifically described.

  The CPU 14 includes a stream control unit 141, a decoder 142, an AV input / output unit 143, and the like. The CPU 14 may be realized by a microcomputer or a hard wired circuit. The CPU 14 may have any configuration as long as it is an integrated circuit.

  The stream control unit 141 reads and acquires the compressed video data from the BD-ROM disc of the disc drive 2. The decoder 142 decodes the compressed video data read by the stream control unit 141, expands the compressed data, and returns the video data.

  The decoder 142 can acquire and decode a plurality of video data stored in the disk drive 2.

  The AV input / output unit 143 processes video data and performs synthesis and the like.

  The disk drive 2 is a disk drive that reads information from a BD, DVD, CD, or the like. Since the disk drive 2 is a general technique, the details are omitted. In the present embodiment, information is read by the disk drive 2, but the present invention is not limited to this, and information may be read from the HD by the HD drive. Alternatively, the video data may be acquired by receiving a broadcast wave broadcast from a broadcasting station.

  The display device 3 is a monitor that displays information output by the player 1. The panel used for the display device 3 may be a liquid crystal panel, an organic EL panel, or a PDP, but is not limited thereto.

<1-2. Video data 1 and video data 2>
FIG. 3 is a diagram showing an example of video data 1 and video data 2 stored in the disk drive 2.

  The video data 1 is called, for example, a primary video, and is mainly used for viewing the main part such as when watching a movie.

  The resolution of the video data 1 after decompression by the decoder 142 is, for example, a video of horizontal 1920 pixels and vertical 1080 pixels, and the horizontal and vertical aspect ratios are in a ratio of 16: 9.

  In the BD-ROM standard, a privilege video or the like is prepared as a secondary video for the primary video and can be combined with the primary video.

  Video data 2 in FIG. 3 shows an example of such secondary video.

  The resolution of the video data 2 after being compressed and decompressed by the decoder 142 is, for example, a video of horizontal 720 pixels and vertical 480 pixels. The aspect ratio of the video is, for example, 3: 2.

  Since the video data 2 is synthesized with the video data 1 in accordance with the luminance level, a portion that is not desired to be displayed after the synthesis is set to a color with reduced luminance, and is processed into, for example, black.

<1-3. CPU functional block>
Next, functional blocks of the CPU 14 will be described. The CPU 14 enlarges or reduces the video data 2 and then synthesizes the video data 2 with the video data 1. Hereinafter, the configuration of the CPU 14 will be described with reference to FIG. FIG. 2 is a functional block diagram of the CPU 14. FIG. 4 is a diagram showing the luminance level for each pixel on the A line in the video data 2 of FIG. Here, FIG. 4 shows the vicinity of the boundary B of FIG.

  Each means of the CPU 14 will be described. Each means can be realized by the AV input / output unit 143 of FIG.

  The boundary detection unit 21 detects a composite boundary of the video data 2 based on the luminance level of the video data 2. As shown in FIG. 4, the luminance value of the video data 2 is such that an area that should be displayed and an area that should not be displayed are separated by the luminance level. For example, a portion of the video data 2 that should not be displayed is processed into black having a low luminance. Therefore, the boundary detection unit 21 can detect the boundary based on the predetermined luminance level after acquiring the video data 2.

  That is, the boundary detection unit 21 can detect the boundary position in units of pixels according to the luminance level. The boundary detection means 21 stores the detected boundary position in a primary memory such as an SRAM so that it can be used next time. For example, the boundary between regions A and B as shown in FIG. 3 is detected. Note that the display area and the non-display area are determined by combining the video data 1 with the video data 1 based on the boundary detected by the boundary detection unit 21.

  As shown in FIG. 7, the pixel repeater 22 replaces pixels in a region that is not displayed based on the pixels in the region that is displayed.

  In the present embodiment, it can be replaced by the following method. For example, as a replacement method, as shown in FIG. 7, a method of replacing a value of a region that is not displayed by using a boundary value of the displayed region can be considered. That is, the pixels in the non-display area are replaced with the pixels at the boundary of the display area. As another method, as shown in FIG. 9, the boundary line is regarded as a mirror, and the pixels in the displayed region are sequentially replaced in a mirror shape as pixels in the non-displayed region.

  The filter means 23 performs enlargement or reduction processing on the video data 2 whose pixels have been replaced by the pixel repeat means 22. More specifically, the filter unit 23 enlarges or reduces the video data 2 whose pixels have been replaced by the pixel repeat unit 22 by performing pixel interpolation. For example, as shown in FIG. 8, the filter unit 23 creates interpolation data using filter coefficients K0 to K3 defined in advance. That is, the filter unit 23 creates interpolation data (black circles in FIG. 8) by multiplying the input pixel data by K0 to K3 and adding them to each other.

  Here, the aspect ratio of the video data 1 is, for example, 16: 9 video, and the aspect ratio of the video data 2 is, for example, 3: 2 video. For this reason, in order to synthesize the video data 2 with the video data 1 while maintaining the aspect ratio, it is necessary to enlarge the image in the horizontal direction to a ratio of 16: 9. Such enlargement processing is generally called square pixel conversion. When the video data 2 is a 4: 3 video, it is necessary to reduce the horizontal direction in order to compose the 16: 9 video. Here, the filter means 23 may enlarge or reduce the pixels only in the displayed area. In this way, only necessary data can be enlarged or reduced, which is efficient.

  In any case, when the aspect ratios of the video data 2 and the video data 1 are different, it is necessary to match the video data 2 with the resolution of the video data 1. Therefore, when the video data 2 is enlarged or reduced, pixel interpolation is performed by means such as the filter means 23.

  The video synthesizing unit 24 synthesizes the display area of the video data 2 processed by the filter unit 23 with the video data 1. As shown in FIG. 8, the video composition unit 24 performs luma key composition on the processed video data 2 to the video data 1. Specifically, the video composition unit 24 replaces (replaces) the information of the displayed area in the processed video data 2 with the corresponding area of the video data 1. As a result, video data in which a part of the video data 2 is combined with the video data 1 is generated. For example, as the synthesized video data, video data as shown in FIG. 5 is generated. For example, the video data 2 can be synthesized with the background as shown in a sketch diagram of an example of the synthesized video according to FIG.

<2. Operation>
Next, an operation example in the video output apparatus 1 will be described with reference to FIG.

  FIG. 6 is a flowchart showing an operation example of the video output apparatus 1 in the present embodiment.

  In FIG. 6, the CPU 14 first acquires the compressed video data of the BD-ROM read by the disk drive 2. The CPU 14 decodes and decompresses the acquired compressed video data. The CPU 14 records the decompressed video data in the buffer memory 12. The video data recorded in the buffer memory 12 is video data including video data 1 and video data 2.

  The CPU 14 acquires the video data 2 recorded in the buffer memory 12 (S501). The CPU 14 detects the boundary of the video data 2 based on a predetermined luminance level (S502). Next, the CPU 14 stores information on the detected boundary position in the buffer memory 12 (S503).

  Based on the detected boundary, the CPU 14 replaces the data of the area that is not displayed with the data of the area that is displayed (S504). The CPU 14 enlarges or reduces the video data 2 replaced in S504 based on the boundary position stored in the buffer memory 12 (S505). Specifically, the CPU 14 enlarges or reduces the displayed area based on the boundary position stored in the buffer memory 12.

  The CPU 14 acquires the video data 1 and replaces the data in the area where the video data 2 is displayed with the video data of the video data 1. Thereby, the video data 2 is synthesized with the video data 1 (S506, S507).

  The CPU 14 outputs the synthesized video data to the display device 2 (S508).

<3. Association between the present invention and the embodiment>
The player 1 is an example of a video output device of the present invention. The display device 3 is an example of a display device. Primary data is an example of main image data. Secondary data is an example of sub image data. In the secondary data, the area combined with the primary data is an example of the first area, and the area not combined is an example of the second area. The CPU 14 is an example of a first acquisition unit, a second acquisition unit, a boundary detection unit, a conversion unit, a synthesis unit, and an output unit.

<4. Summary>
A video output device 1 that can be connected to the display device 3, and includes a CPU 14 that acquires primary data, and a CPU 14 that acquires secondary data having a first region indicating a first image and a second region indicating a second image. The CPU 14 that detects the boundary between the first area and the second area of the acquired secondary data, the CPU 14 that converts the secondary data based on the boundary detected by the CPU 14, and at least a part of the converted secondary data, CPU14 which synthesize | combines with the acquired primary data and produces | generates synthetic image data, and CPU14 which outputs synthetic | combination image data to the display apparatus 3 are provided.

  In this way, the player 1 is based on the boundary between the first area and the second area even when performing image processing on the secondary data before combining a part of the secondary data with the primary data. Secondary data can be converted. For example, the player 1 can enlarge or reduce the image data in the first area without using the image data in the second area of the secondary data.

  That is, according to the present embodiment, the boundary detection unit 21 detects the composite boundary of the video data 2 and replaces the pixel data of the area not displayed with the pixel data of the area displayed by the pixel repeat unit 22. Then, after the video data 2 is enlarged or reduced by the disk drive 23, the video data 2 is synthesized with the video data 1 by the video synthesis means 24. As a result, it is possible to reduce the wave noise called ringing in the synthesized contour of the video data 2, and it is possible to synthesize more beautifully.

If the image data of the displayed area is enlarged or reduced based on the image data of the non-displayed area, the image data of the displayed area after the interpolation is affected by the image data of the non-displayed area. . For example, when the luminance of a region that is not displayed is painted black, the pixel after pixel interpolation is greatly waved under the influence of the pixel that is not displayed as shown in FIG. For this reason, contour noise is generated at the synthesis boundary in the image data of the video data 2 synthesized with the video data 1.
(Example 2)
<1. Configuration>
Next, Example 2 will be described. In the second embodiment, the description of the same configuration as that of the first embodiment is omitted.

  FIG. 11 is a diagram illustrating functional blocks of the CPU 14 according to the second embodiment.

  In FIG. 11, the boundary detection means 21 detects the composite boundary of the video data 2 based on a predetermined luminance level. The pixel repeat unit 22 replaces a pixel that is not displayed at the boundary detected by the boundary detection unit 21 with a pixel created using the displayed pixel. The filter unit 23 is a pixel repeat unit 22 that performs filter enlargement / reduction using the video image replaced with the video data of the area displayed after the synthesis. The video synthesis unit 24 is processed as described above. The video data 2 and the video data 1 are combined. Functional blocks similar to those in the first embodiment are described with the same numbers.

  The difference from the first embodiment is that a correlation detection unit 25 and a selection unit 26 are provided. The correlation detection unit 25 calculates the correlation of luminance before and after the boundary based on the boundary position information detected by the boundary detection unit 21. It is a means to detect.

  The correlation is, for example, for detecting a gradient of luminance due to a difference between preceding and subsequent pixel data.

  As shown in FIG. 12, the video data 2 read from the BD-ROM may not be processed to reduce the luminance of data in a region that is not displayed, and is displayed as a natural image, for example. There may be a smooth connection between the area and the area that is not displayed.

  In this case, the luminance gradient is small even near the boundary.

  As shown in the first embodiment, the video data 2 in which a non-display area is filled with black, as shown by a broken line in FIG. 12, indicates that the correlation of luminance suddenly disappears at the boundary. A steep step occurs, and the luminance gradient changes greatly.

  Using this change, the selection means 26 selects the output of the pixel repeat means 22 and the unprocessed video data 2 and inputs them to the filter means 23.

  In the case of a natural image as shown in FIG. 12, if the pixel data of the displayed area is replaced with interpolation and enlarged / reduced, the outline may be noticeably sharper than necessary, so the boundary is gently connected. If it is, the filter enlargement / reduction can be performed using the data of the non-display area without replacing the pixel data of the display area.

<2. Operation>
Next, the operation of the second embodiment will be described.

  FIG. 13 is a flowchart for explaining the operation of the second embodiment.

  In FIG. 13, the CPU 14 decodes the read video data of the BD-ROM from the disk drive 2 to obtain the video data 1 and the video data 2 (S501).

  The CPU 14 detects the boundary of the video data 2 based on the luminance level (S502). Next, the CPU 14 stores information on the detected boundary position in the memory (S503).

Based on the detected boundary, the CPU 14 replaces the data of the area that is not displayed with the data of the area that is displayed (S504). On the other hand, the CPU 14 detects the correlation between the pixels before and after the boundary position based on the detected boundary (S508). If the correlation is large based on the detected correlation, the CPU 14 enlarges / reduces the video data 2 while interpolating pixels (S510). On the other hand, when the correlation is small, the pixel interpolation of the video data of the displayed area and the replaced video data 2 is enlarged or reduced based on the stored composite boundary position (S505). (S509)
The video is synthesized by replacing the data in the area where the video data 1 and the video data 2 are displayed with the video data at the display position of the video data 1 (S506).

  The synthesized video data is output to the display device (S507).

<3. Summary>
According to the second embodiment, the correlation detection unit 25 detects the correlation before and after the synthesis boundary, and the selection unit 26 determines whether the filter is enlarged or reduced by the data replaced with only the displayed pixels, or before replacement. By selecting whether to enlarge / reduce the size of the image data, if the brightness level of the data in the area that is not displayed is intentionally reduced, the influence of the data in the area that is not displayed is eliminated to reduce the ringing noise of the contour If the data of the displayed area and the data of the non-displayed area are connected smoothly, the data of the non-displayed area is also used to interpolate and perform filter enlargement / reduction to suppress unnecessary enhancement of the contour. Can be synthesized more beautifully.

  In the embodiment, the enlargement / reduction when the video data 2 is adjusted to the aspect ratio of the video data 1 has been described as an example. It is allowed and can be adapted in this case as well.

It can also be applied to noise reduction that eliminates unnecessary signals by performing pixel-to-pixel calculations.
(Other embodiments)
In the above embodiment, the example in which the present invention is applied to the BD player 1 has been described as Examples 1 and 2. However, the present invention is not limited to this, and the present invention can be applied to various forms. Hereinafter, an example is demonstrated about another form.

  In the first and second embodiments, in step 502, the CPU 14 detects the boundary of the video data 2 based on a predetermined luminance level. However, the present invention is not limited to this. For example, an arbitrary luminance level may be calculated based on the overall brightness of the video data 2, and the boundary of the video data 2 may be detected based on the calculated luminance level. In this way, it is possible to reduce the fact that a part of the display area of the video data 2 is not displayed.

  Moreover, it is not restricted to the said embodiment, You may comprise as FIG. FIG. 14 is an enlarged view of a part of the image data. FIG. 14 shows the N-3rd line, the N-2th line, the N-1th line,. That is, in the above-described embodiment, for example, when the pixel of the A line is enlarged or reduced and the pixel interpolation is performed, the interpolation is performed using the image line of the A line. However, as shown in FIG. 14, when interpolating the N−1 line image, the interpolation may be performed using the N−1 line and N line pixels. In this way, it is possible to further reduce the jaggedness of the video near the boundary.

  In the first and second embodiments, the interpolation data for enlargement / reduction is created using the data of the displayed area with the synthesis boundary as the boundary, but the synthesis boundary of the luma key synthesis is determined by the luminance level. The same effect can be obtained by a method in which pixel data whose luminance level is lower than the luma key threshold is not used based on the luminance level.

  The present invention is not limited to the BD-ROM, and can be applied to applications such as televisions and game machines that process different images on the same background image and combine them with other images.

DESCRIPTION OF SYMBOLS 1 Player 2 Disc drive 3 Display apparatus 4 Remote control 11 Flash memory 12 Buffer memory 13 Connector 14 CPU
DESCRIPTION OF SYMBOLS 15 Infrared sensor 141 Stream control part 142 Decoder 143 AV input / output part 21 Boundary detection means 22 Pixel repeat means 23 Filter means 24 Image composition means 25 Correlation detection means 26 Selection means

Claims (7)

A video output device connectable with a display device,
First acquisition means for acquiring main image data;
Second acquisition means for acquiring sub-image data having a first region indicating a first image and a second region indicating a second image;
Boundary detection means for detecting a boundary between the first region and the second region of the acquired sub-image data;
Conversion means for converting the sub-image data into image data different from the sub-image data based on the detected boundary;
Combining means for combining at least a part of the converted sub image data with the acquired main image data to generate combined image data;
Output means for outputting the composite image data to the display device;
A video output device comprising: The conversion means converts the sub image data of the first region acquired based on the detected boundary into image data having a larger number of pixels than the sub image data.
The video output device according to claim 1. The conversion means uses the sub image data of the first area or the first area and the second area according to a change in feature information of the sub image data of the first area and the second area at the detected boundary. Select whether to use the sub image data of the selected area, and convert the sub image data of the selected area.
The video output device according to claim 1. The boundary detection means detects a boundary between the first region and the second region of the acquired sub-image data based on predetermined or arbitrary feature information;
The video output device according to claim 1. The synthesizing unit synthesizes the image data of the first region of the converted sub image data with the acquired main image data, and generates synthesized image data.
The video output device according to claim 1. The converting means converts the sub image data based on the image data of the first area, not based on the image data of the second area,
The synthesizing unit synthesizes the image data of the first region of the converted sub image data with the acquired main image data, and generates synthesized image data.
The video output device according to claim 1. The main image data and the sub image data have different formats for video recording.
The video output device according to claim 1.

Images