JP2011019137A - Video output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that video different from the content creator's intention is displayed when colorimetry conversion is executed before luminance-key composition.SOLUTION: The video output device is equipped with: a stream control part 201 that receives a content so as to produce a first stream and a second stream; a first decoder for decoding the first stream into main video data; a second decoder 203 for decoding the second stream into sub video data of a format different from that of the main video data; a conversion part for converting the format of the sub video data into the same format of the main video data; a comparison part for comparing luminance level information included in the received content with the sub video data outputted from the second decoder 203; and a composition part for composing the main video data with the sub video data, whose format is converted into the same format of the main video data by the conversion part, on the basis of the result of the comparison part.

Description

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

  The player reads video data from the optical disc and outputs the read video data to the display device. The display device displays an image based on the input image data. Video data is recorded along with audio data on the optical disc.

  Here, two kinds of video data called primary video and secondary video can be recorded on the optical disc. The player can acquire the primary video and the secondary video, synthesize these video signals, and output them as a picture-in-picture.

  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 colorimetric conversion of the secondary video, the synthesis 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. Therefore, if the color conversion called colorimetric conversion of the secondary video is performed before the luma key composition, the luminance level of the secondary video changes. Then, when the luma level recorded on the optical disc is adapted and synthesized, unlike the creator of the content, pixels that are not actually displayed are displayed or pixels that must be displayed are not displayed.

  As described above, if colorimetric conversion is performed before the luma key synthesis and the luma level recorded on the optical disk is applied in a state where the luminance level is changed, the synthesis quality of the secondary video is deteriorated. Note that primary video is an example of main video data, secondary video is an example of sub video data, and luma key synthesis is an example of partial synthesis that synthesizes a part of sub video data into main video data.

  Accordingly, in order to solve the above-described problems, the present invention has an object to provide a video output apparatus that can further reduce the deterioration in the quality of sub video data when a part of sub video data is combined with main video data. And

  In order to solve the above problems, a video output device according to the present invention includes a stream control unit that receives content and creates a first stream and a second stream, and a first decoder that decodes the first stream into main video data. 1 decoder, a second decoder for decoding the second stream into sub-video data having a format different from that of the main video data, and a converter for converting the sub-video data into the same format as the main video data; A comparison unit that compares luma level information included in the received content with the sub video data output from the second decoder, and based on a result of the comparison unit, the main video data and the conversion unit perform the main video A synthesizing unit that synthesizes the sub video data converted into the same format as the data. That.

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

The figure which shows the structure of the video output device of this invention The figure which shows the functional block of LSI105 of Embodiment 1. The figure which shows the functional block of LSI105 of Embodiment 2. The figure which shows the functional block of LSI105 of Embodiment 3. The figure which shows a functional block at the time of providing the scaling part in LSI105 of Embodiment 2. FIG. Conceptual diagram for explaining conversion from 4: 2: 0 video signal to 4: 4: 4 video signal The figure which showed an example of the video data 1 memorize | stored in the disk 100 The figure which showed an example of the video data 2 memorize | stored in the disk 100 The figure which showed an example of the video data after synthesize | combining the video data 1 and the video data 2 Flowchart for explaining the operation of the second embodiment Conceptual diagram when the comparison of the luma level of the first luma level adaptation unit 206 is adapted Figure showing an example of secondary video The figure which showed an example of the binary data in the 1st luma level detection part 206 Diagram showing an example of binary data when the luma level is applied The figure which shows the example when the picture which is different from the original is displayed The figure which shows an example of binary data in case the 2nd scaling part 212 is installed in the front | former stage of the 1st luma level adaptation part 206. Diagram showing when secondary video is not displayed properly The figure which shows the functional block of LSI105 of Embodiment 4.

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

  In the present embodiment, when the video data 2 as shown in FIG. 8 is lumakey-combined with the video data 1 in FIG. 7 to generate the video data as shown in FIG. 9, the video of the video data 2 is more beautifully superimposed. Realized.

(Embodiment 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 102 receives an operation from the user by the remote controller 108, the player 102 acquires video data from the disc 100 by the disc drive unit 101, processes it, and displays it on the television 109. This will be specifically described below.

  The player 102 includes a disk drive unit 101, a flash memory 103, a memory 104, a connector 106, an LSI 105, an infrared sensor 107, and the like. The flash memory 103 stores software for operating the player 102. The memory 104 is a storage unit for data necessary for decoding video data or performing processing such as enlargement / reduction. The memory 104 can be realized by, for example, a DRAM.

  The connector 106 prepares data for connection to the television 109. The connector 106 is connected to the disk drive unit 101 by wire or wireless, and enables data transmission / reception with the disk drive unit 101.

  The LSI 105 is a part that performs the main operation of the player 102. The LSI 105 acquires video data on the disc 100 from the disc drive unit 101 based on a user operation signal received by the infrared sensor 107 and processes it into a form that can be output to the television 109. The configuration of the LSI 105 will be specifically described.

  The LSI 105 includes a stream control unit 201, a first video decoder 202, a video synthesis unit 204, a second video decoder 203, a first colorimetric conversion unit 205, a first luma level adaptation unit 206, and the like. The LSI 105 may be realized by a microcomputer or a hard-wired circuit. The LSI 105 may have any configuration as long as it is an integrated circuit.

  The disk drive unit 101 is a disk drive that reads information from the disk 100. The disc 100 is, for example, an optical disc such as a BD, DVD, or CD. Since the disk drive unit 101 is a general technique, the details are omitted. In this embodiment, information is read from the disk 100 by the disk drive unit 101. However, the present invention is not limited to this, and information may be read from the hard disk by the HDD drive. Alternatively, the video data may be acquired by receiving a broadcast wave broadcast from a broadcasting station.

  The television 109 is a monitor that displays information output by the player 102. A panel used for the television 109 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. 7 is a diagram showing an example of the video data 1 stored in the disk 100 extracted from the disk drive unit 101. FIG. 8 is a diagram showing an example of the video data 2 stored on the disk 100 extracted from the disk drive unit 101.

  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 the compression is expanded by the first video decoder 202 is, for example, a video of horizontal 1920 pixels and vertical 1080 pixels, and the horizontal and vertical aspect ratio is a ratio of 16: 9. Yes.

  On the other hand, a privilege video or the like can be prepared as a secondary video for the primary video and synthesized with the primary video.

  Video data 2 in FIG. 8 shows an example of such secondary video.

  The resolution of the video data 2 after being compressed and expanded by the second video decoder 203 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. LSI Functional Block>
Next, functional blocks of the LSI 105 will be described. After processing the video data 2, the LSI 105 combines the video data 2 with the video data 1. Hereinafter, the configuration of the LSI 105 will be described with reference to FIG. FIG. 2 is a diagram showing functional blocks of the LSI 105.

  Each part of the LSI 105 will be described. The stream control unit 201 reads out and acquires the compressed video data of the disc 100 from the disc drive unit 101. Also, the stream control unit 201 outputs compressed video data corresponding to the primary video and compressed video data corresponding to the secondary video based on the video data from the disc 100. The first video decoder 202 decodes and decompresses the compressed video data corresponding to the primary video output from the stream control unit 201, and outputs it as video data 1.

  The second video decoder 203 decodes and decompresses the compressed video data corresponding to the secondary video output from the stream control unit 201, and outputs it as video data 2. The video composition unit 204, the first colorimetric conversion unit 205, the first luma level adaptation unit 206, and the like process the video data and perform synthesis and the like. The video data 2 decoded by the stream control unit 201 is colorimetrically converted by the first colorimetric conversion unit 205 and output to the video composition unit 204. The colorimetric conversion will be described later.

  The video data 2 decoded by the second video decoder 203 is output to the first luma level adaptation unit 206. The luma level for luma key composition is input from the disk drive unit 101 to the first luma level adaptation unit 206. The first luma level adaptation unit 206 compares the luma level with the luminance signal of the video data 2 input from the second video decoder 203. Based on the comparison information, the first luma level adaptation unit 206 displays the pixel of the video data 1 when the value of each pixel of the luminance signal of the video data 2 is smaller than the luma level recorded on the disc 100. When the value of each pixel of the luminance signal of the video data 2 is larger than the luma level recorded on the disc 100, binary data for displaying each pixel of the video data 2 is output.

  FIG. 11 shows a conceptual diagram when the comparison of the luma level of the first luma level adaptation unit 206 is adapted. When the luma level recorded on the disc 100 is applied to the video data 2 in FIG. 8, it can be expressed by binary data as shown in FIG. After the composition, video data 2 shown in FIG. 8 is displayed in the white portion shown in FIG. 11, and video data 1 shown in FIG. 7 is displayed in the black portion shown in FIG. In this way, the first luma level adaptation unit 206 adapts the comparison of luma levels recorded on the disc 100 to the video data 2.

  The video composition unit 204 uses the adaptation result to synthesize the video data 1 and the video data 2 by the video composition unit 204, thereby obtaining a composite video as shown in FIG. Since FIG. 11 is a conceptual diagram for explanation, it is not always necessary to create such data.

  Next, colorimetric conversion will be described. The first colorimetric conversion unit 205 converts the color area of the video data 2.

  The video standard includes, for example, a color space (referred to as 709 color space) in which the relationship between RGB and color difference format (YCbCr) is determined by ITU-R BT.709, as shown by an example in Equation 1, and Equation 2 The color space defined by ITU-R BT.601 or the like (referred to as 601 color space) is shown in FIG.

(Formula 1)
Y '= 0.2 * R + 0.7 * G + 0.07 * B
Cb ′ = − 0.1 * R−0.3 * G + 0.5 * B
Cr ′ = 0.5 * R−0.4 * G−0.04 * B

(Formula 2)
Y = 0.3 * R + 0.5 * G + 0.1 * B
Cb = -0.1 * R-0.3 * G + 0.5 * B
Cr = 0.5 * R-0.4 * G-0.07 * B

  Here, the primary video and the secondary video have different color spaces. Therefore, in order to synthesize the primary video and the secondary video, it is necessary to convert the color space and synthesize in a state in which the colors match. Therefore, colorimetric conversion is performed to match the colors of the primary video and the secondary video.

  In the first colorimetric conversion unit 205, for example, the R, G, and B terms are removed from Equations 1 and 2, and a calculation equation (Equation 3) or the like is used to create a 709 color space from the 601 color space. Calculation to convert to.

(Formula 3)
Y ′ = Y−0.12 * Cb−0.2 * Cr
Cb ′ = 1.0 * Cb + 0.1Cr
Cr ′ = 0.1 * Cb + 1.0 * Cr

  As can be seen from Equation 3, the value of the luminance information indicated by Y and Y ′ also changes due to the conversion of the color space. That is, even for the same video signal, the value of the luminance signal differs depending on whether it is the 601 color space or the 709 color space. Therefore, the comparison result differs between the case where the luminance signal of the video data 2 is compared with its luma level before colorimetric conversion and the case where the luminance signal of the video data 2 is compared with its luma level after colorimetric conversion.

  The luma level described in the disc 100 is assumed to compare the luminance signal of the video data 2 and its luma level before colorimetric conversion, so the luminance signal of the video data 2 and its luma level are compared after colorimetric conversion. When the video composition unit 204 synthesizes the video using the comparison result, the composition is different from the intention of the original content creator.

  A specific example will be described below. FIG. 14 is an example of binary data when the luma level is applied. The binary data in the video data 2 should originally have the shape shown in FIG. However, the binary data shown in FIG. 14 can be obtained by the change in the value of the luminance signal due to the color conversion. In FIG. 14, the portion corresponding to the tire of the bus is erroneously recognized as the background. When the video data is synthesized by the video synthesis unit 204 using the binary data shown in FIG. 14, the video described in is output.

  Further, since the calculation of the first colorimetric conversion unit 205 uses luminance information and color difference information for each pixel, a 444 video format as shown in FIG. 6 is used. In FIG. 6, ◯ indicates a luminance signal, and □ indicates a color signal. By interpolating 420 video signals, 444 video signals are created.

  In the present embodiment, the decoding results of the first video decoder 202 and the second video decoder 203 are decoded in the 420 format shown in FIG.

  Since the information on the color difference (Cb, Cr) is less than the luminance (Y), the color difference signal is interpolated and converted into the 444 format, and then colorimetric conversion and video synthesis are performed.

<2. Summary>
According to the present embodiment, the player 102 can synthesize the primary video in accordance with the luma level intended by the content producer, even if the color space of the secondary video is converted. As a result, even if the luminance signal is converted by colorimetric conversion of the secondary video, the luma level adaptation is performed even before the luminance signal is converted, so the video at the time of composition is created more Can be synthesized as intended.

  If the luma level recorded on the disc 100 is adapted to the luminance level changed by the colorimetric conversion due to colorimetric conversion or the like, it is the composition intended by the content creator. For example, as shown in FIG. If an unintended level appears and the video is synthesized, the video to be displayed disappears or an unintended video appears as shown in FIG.

  In the video output apparatus according to the present embodiment, luma level adaptation is performed on the video signal before being colorimetrically converted. Therefore, it is not necessary to consider that the luma level information recorded on the disc 100 is colorimetrically converted. That is, since the secondary video recorded on the disc 100 can be created and edited without conversion, the luma level can be easily set.

(Embodiment 2)
<1. Configuration>
Next, a second embodiment will be described. In the second embodiment, the description of the same configuration as in the first embodiment is omitted.

  FIG. 3 is a diagram showing functional blocks of the LSI 105 in the second embodiment.

  In FIG. 3, the determination unit 209 uses the disc drive unit 101 to select a location for performing luma level adaptation based on information from the disc 100, the type of the disc 100, and data recorded on the disc 100. Judgment is made. Based on the determination result of determination unit 209, switching unit 208 selects whether output from second luma level adaptation unit 207 or first luma level adaptation unit 206 is to be synthesized by video synthesis unit 204 Part.

  The difference from the first embodiment is that a determination unit 209, a switching unit 208, and a second luma level adaptation unit 207 are provided. Based on the information acquired by the determination unit 209, the switching unit 208 performs the second operation. The point is that either the luma level adaptation unit 207 or the first luma level adaptation unit 206 can be selected.

  That is, when it is determined that the luma level recorded on the disc 100 is a value before colorimetric conversion of the video data based on the type of the disc 100 and the data recorded on the disc 100, the first When the data applied by the first luma level adaptation unit 206 is used before the colorimetry conversion unit 205 and it is determined that the luma level recorded on the disc 100 is a value after colorimetry conversion, the first colorimetry is performed. The data synthesized by the second luma level adaptation unit 207 after the conversion unit 205 is synthesized by the video synthesis unit 204.

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

  FIG. 10 is a flowchart for explaining the operation of the second embodiment. In FIG. 10, the LSI 105 acquires the type of the disk 100 or the read information from the disk drive unit 101 (S1).

  The LSI 105 determines whether the luma level recorded on the disk 100 is a value before colorimetric conversion or a value after colorimetric conversion (S2). When the luma level recorded on the disc 100 is a value before colorimetric conversion, the switch of the switching unit 208 is used as the first luma level adaptation unit 206, and data using the luma level adapted before colorimetry conversion is used. The video is synthesized (S3). When the luma level recorded on the disc 100 is a value after colorimetric conversion, the switch of the switching unit 208 is used as the second luma level adaptation unit 207, and the data using the luma level adapted after colorimetric conversion is used to display the video. Is synthesized. (S4)

<3. Summary>
According to the second embodiment, the determination unit 209 determines whether the luma level recorded on the disc 100 is before or after colorimetric conversion based on the type of the disc 100 and the data recorded on the disc 100. The switching unit 208 selects a luma level adaptation location. As a result, it is possible to perform composition that suits the content creator's intention, and at the time of image composition, it is possible to suppress the periphery of the outline, unnecessary images appearing, and necessary images disappearing. It can be beautifully synthesized.

  In the present embodiment, the adaptive data is switched by the switching unit 208, but only the circuit of the second luma level adaptation unit 207 or the first luma level adaptation unit 206 may be provided. In that case, the switching unit 208 may not be provided. In this case, according to the determination by the determination unit 209, if there is a reproducible circuit, the reproduction is performed. If there is no reproducible circuit, the reproduction may not be performed.

  Thereby, even if it is a video output device provided only with the 2nd luma level adaptation part 207 or the 1st luma level adaptation part 206, when it can reproduce, it can reproduce correctly.

  Note that when luma level adaptation is performed on a video signal that has not undergone colorimetric conversion, information relating to luma level recorded on the disc 100 need not be considered to be colorimetric converted. That is, since the secondary video recorded on the disc 100 can be created and edited without conversion, the luma level can be easily set.

  Further, in the case of a video output device that performs luma level adaptation on a video signal after colorimetric conversion, the circuit configuration is simplified. The reason is that it is not necessary to temporarily hold the result of the luma level adaptation.

  When the second luma level adaptation unit 207 executes luma level adaptation, the video data input to the second luma level adaptation unit 207 is a signal that has undergone colorimetry conversion by the first colorimetry conversion unit 205. That is, as is clear from Equation 3, the luminance signal is different from the original luminance signal. Therefore, it is preferable to correct the luminance signal input to the second luma level adaptation unit 207 in consideration of colorimetric conversion and conversion to 444. The conversion formulas and conversion coefficients used for the colorimetric conversion and the conversion to 444 may be stored in advance in the disk 100 and read from the disk 100 during reproduction. Alternatively, a predetermined value recorded in the video output device may be used. That is, the conversion formula used in the first colorimetric conversion unit 205 is not necessarily constant.

(Embodiment 3)
<1. Configuration>
Next, a third embodiment will be described. In the third embodiment, the description of the same configuration as in the first embodiment is omitted.

  FIG. 4 is a diagram showing functional blocks of the LSI 105 in the third embodiment. In FIG. 4, the first scaling unit 210 is a scaler that scales the video data of the first video decoder 202, and the third scaling unit 211 scales the video data of the second video decoder 203. The second scaling unit 212 is a scaler that enlarges / reduces the data of the first luma level adaptation unit 206.

  The difference from the first embodiment is that each scaler includes a first scaling unit 210, a third scaling unit 211, and a second scaling unit 212.

<2. Operation>
The operation of the third embodiment will be described with reference to FIG. 7, FIG. 12, FIG. 13, and FIG. The video data 1 shown in FIG. 7 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 the compression is expanded by the first video decoder 202 is, for example, a video of horizontal 1920 pixels and vertical 1080 pixels, and the horizontal and vertical aspect ratio is a ratio of 16: 9. Yes.

  Video data 2 in FIG. 12 shows an example of secondary video. The resolution of the video data 2 after being compressed and expanded by the second video decoder 203 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. When the video data 2 is combined with the video data 1, when the video aspect ratio is combined with the primary video, the aspect ratio differs. Therefore, as shown in FIG. Enlarge and compose the video.

  At this time, the data corresponding to the luma level recorded on the disc 100 of the first luma level adaptation unit 206 is also enlarged by the second scaling unit 212. By using the video synthesis unit 204 to synthesize the video using the secondary video and the luma level adaptation data expanded by the second scaling unit 212, the aspect ratio of the primary video and the secondary video is obtained. Can be combined together.

  In addition, the second scaling unit 212 is installed at the subsequent stage of the first luma level adaptation unit 206. In the case where the second scaling unit 212 is installed before the first luma level adaptation unit 206, the second scaling unit 212 executes luma level adaptation after scaling. Then, due to the scaling, the brightness level of the contour is blurred or ringing occurs. As a result, when the luma level is applied in this state, the secondary video synthesized by the video synthesizer 204 is not properly synthesized.

  A specific example will be described below. FIG. 16 is an example of binary data in the case where the second scaling unit 212 is installed in the previous stage of the first luma level adaptation unit 206. In FIG. 16, a portion that should originally be white is misrecognized as a background, and a portion that is originally a background is misrecognized as white. ing. For this reason, when video synthesis is performed by the video synthesis unit 204, as shown in FIG. 17, the secondary video corresponding to the portion that is erroneously recognized as the background is not displayed. In addition, a black image is superimposed on the primary video corresponding to the portion that is erroneously recognized as white.

  In the video output apparatus according to the present embodiment, the second scaling unit 212 is installed at the subsequent stage of the first luma level adaptation unit 206, so that the above-described problem can be prevented.

  Further, as an interpolation method at the time of scaling in the second scaling unit 212, it is possible to take only 0 or 1 using majority processing or the like for the data to be synthesized after adaptation of the luma level.

  FIG. 13 is an example of binary data in the first luma level detection unit 206. Moreover, you may provide a scaling part with respect to the form of Embodiment 2 as shown in FIG.

<3. Summary>
According to the third embodiment, in accordance with the enlargement by the third scaling unit 211, the data adapted to the luma level is also enlarged by the second scaling unit 212. Thereby, the luma level can be adapted without being influenced by the luminance change due to the scaling by the third scaling unit 211 or the like.

  In this way, the player 102 can synthesize the primary data with the primary data according to the luma level intended by the content producer, even if the color space of the secondary data is converted and scaling is performed to match the aspect ratio.

  Thus, even if the secondary data is colorimetrically converted and scaled, the video boundary at the time of synthesis can be synthesized more beautifully without converting the luma level.

(Embodiment 4)
Next, a fourth embodiment will be described. FIG. 18 is a diagram showing a configuration of the fourth embodiment. Compared with the first embodiment, this embodiment has a disc drive unit 101, a stream control unit 201, a first video decoder 202, a second video decoder 203, a video composition unit 204, and a first luma level adaptation unit 206. Have the same configuration. Further, the second colorimetric conversion unit 205 is different from the first colorimetric conversion unit 205 in that a second colorimetry conversion unit 213 and a third colorimetry conversion unit 214 are provided. The same configuration as that of the first embodiment performs the same operation, and thus the description thereof is omitted.

  The video data 1 output from the first video decoder 202 is colorimetrically converted by the second colorimetric converter 213. Specifically, the color area of the video data 1 is converted so that the color area of the video data 1 is the same as the color area of the video data 2. Then, the video data 1 whose color area is converted and the video data 2 output from the second video decoder 203 are combined by the video combining unit 204 and output. The third colorimetric conversion unit 214 performs colorimetric conversion on the video data output from the video composition unit 204. Specifically, the third colorimetric conversion unit 214 converts the video data output from the video synthesis unit 204 into the same color area as the video data 1 output from the first video decoder 202 and outputs the same.

(Other embodiments)
In the above embodiment, the case where the present invention is applied to the player 102 has been described as the first to fourth embodiments. 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 Embodiments 1 to 4 described above, the LSI 105 detects the luma level recorded on the optical disc in the first luma level adaptation unit 206 and the second luma level adaptation unit 207, but 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 1 and the video data 2, and the luma level may be defined based on the calculated luminance level.

  The present invention is not limited to an optical disc such as a BD-ROM, but is used for processing a video and synthesizing it with another video, such as a television or a game machine, where it is desired to display different videos superimposed on the same background image. Applicable.

100 disk 101 disk drive unit 102 player 103 flash memory 104 memory 105 LSI
106 Connector 107 Infrared sensor 108 Remote control 109 Television 201 Stream control unit 202 First video decoder 203 Second video decoder 204 Video composition unit 205 First colorimetric conversion unit 206 First luma level adaptation unit 207 Second luma level adaptation Unit 208 switching unit 209 determination unit 210 first scaling unit 211 third scaling unit 212 second scaling unit 213 second colorimetry unit 214 third colorimetry unit

Claims (2)

A stream control unit that receives content and creates a first stream and a second stream;
A first decoder for decoding the first stream into main video data;
A second decoder for decoding the second stream into sub-video data having a format different from that of the main video data;
A conversion unit for converting the sub video data into the same format as the main video data;
A comparison unit that compares luma level information included in the received content with the sub video data output from the second decoder;
A video output device comprising: a synthesis unit that synthesizes the main video data and the sub video data converted into the same format as the main video data by the conversion unit based on the result of the comparison unit.   The video output apparatus according to claim 1, wherein the format is a color space.

Images