JP2009038682A - Image processor, and image processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image processor and image processing method, capable of preventing a color change in display if the image is synthesized. <P>SOLUTION: The image processor includes a video graphic processor 12 for synthesizing a plurality of image signals to generate a synthesized image signal and an HDMI Tx 14 for transmitting the recognition flag of a first color space standard or a second color space standard having a color gamut wider than that specified by the first color space standard as the color space standard of the synthesized image signal if the synthesized signal is transmitted. A host CPU 13 determines the first or second color space standard so as to prevent the color change in display. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image processing apparatus and an image processing method for processing a plurality of image data having different color space information.

  Conventionally, in display and HDTV (High Definition TeleVision) broadcasting, sRGB (IEC (International Electrotechnical Commission) 61966-2-1) and ITU-R (International Telecommunication Union-Radiocommunication Sector) BT. The color space standardized in 709 is widely used, but in recent years, with the advent of wide color gamut panels, color representation of a wide color gamut exceeding sRGB has become possible on the receiver side.

  In such a receiver, in order to make use of the wide color gamut of the panel, a technique for expanding the color gamut by signal processing on the video content in the sRGB color space (hereinafter referred to as “color gamut expansion processing”). The receiver can reproduce a more vivid color by performing color gamut expansion processing on a highly saturated color that is clipped in the sRGB color space. In addition, the user can turn on / off the color gamut expansion processing by selecting the image quality mode of the receiver.

  The receiver can also receive color space information from the source device together with the video signal using, for example, HDMI (High-Definition Multimedia Interface). In the case of 709, it is possible to automatically perform control such as turning on the color gamut expansion process and turning off the color gamut expansion process in the case of color space information of other wide color gamuts.

  On the other hand, the image sensor and camera signal processing have also widened color gamut, and a wide color gamut signal with a color gamut exceeding the sRGB taken by the camera can be recorded and reproduced on a disk or tape. Also, a wide color gamut signal recorded on a disk or tape is dubbed to an optical disk recorder via a digital interface such as IEEE (Institute of Electrical and Electronic Engineers) 1394, or the disk on which a wide color gamut signal is recorded is recorded. It can also be played back by an optical disk recorder or player. Cameras and recorders can also transmit these wide color gamut signals and color space information to the receiver using HDMI.

JP 2006-180477 A

  By the way, when the color gamut expansion processing of the receiver is turned on / off, the color of the displayed image, the color density, and the like change. For example, in the case of blending a moving image / still image on a graphic background of a certain color, if the color space information is changed according to the attribute of the moving image / still image of the background, the receiver switches the color gamut expansion processing according to the color space information. For this reason, the color of graphics that should be a constant color changes on display. For this reason, the user may feel uncomfortable in display.

  When a plurality of moving images / still images, graphics, and the like are combined, for example, the color space standard of the combined image is all BT. Even when one moving image / still image changes to a wide color gamut from the state of 709, if the color space information is changed according to the attribute of the moving image / still image, the receiver performs the color gamut expansion processing according to the color space information. Since switching, the colors of graphics and other moving images / still images may change on the display, which may make it unsightly.

  The present invention has been proposed in view of such a conventional situation, and provides an image processing apparatus and an image processing method capable of preventing a color from being changed on display when an image is synthesized. With the goal.

  In order to solve the above-described problem, an image processing apparatus according to the present invention includes an image signal of a first color space standard and a second color gamut wider than a color gamut defined by the first color space standard. An image processing apparatus that performs signal processing on an image signal of a color space standard, the image processing means for combining a plurality of image signals to generate a combined image signal, and the color space information of the combined image signal as the first image signal. Control means for determining either the color space standard or the second color space standard; and transmission means for transmitting the composite image signal and the determined color space information in accordance with a predetermined digital video signal transmission standard. The control means is configured to respond to at least one of color space standards of a plurality of image signals synthesized by the image processing means and color space information transmitted before switching to the synthesized image signal. Determine the color space information.

  The image processing method according to the present invention includes an image signal of the first color space standard, an image signal of the second color space standard having a wider color gamut than the color gamut defined by the first color space standard, and An image processing method for synthesizing a plurality of image signals to generate a synthesized image signal, and color space information of the synthesized image signal as the first color space standard or the second image processing method. A control step for determining one of the color space standards, and a transmission step for transmitting the composite image signal and the determined color space information in accordance with a predetermined digital video signal transmission standard. The color space information of the composite image signal is determined according to at least one of the color space standards of the plurality of image signals combined by the image processing means and the color space information transmitted before switching to the composite image signal. .

  According to the present invention, since the color space information of the composite image signal is fixed, it is possible to prevent the color on the display side from changing on the display side.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a playback system according to an embodiment of the present invention. In this playback system, a recording / playback apparatus 1 and a receiver 2 are connected via an HDMI (High-Definition Multimedia Interface) cable 3, and the receiver 2 receives image data of the first color space standard. Thus, it is possible to display the image data of the second color space standard having a wider color gamut than the color gamut defined by the first color space standard in a pseudo-expanded manner. Examples of the first color space standard include sRGB (IEC 61966-2-1), ITU-R BT. 709 and the like. Examples of the second color space standard include xvYCC.

  xvYCC is a standard issued by the International Electrotechnical Commission (IEC) as an international standard (IEC 61966-2-4), and is an ITU-R BT. The color space is expanded while ensuring compatibility with the 709 color gamut (equivalent to sRGB). According to this xvYCC, it is possible to express a color that cannot be expressed by the color space standard “ITU-R BT.709” (corresponding to sRGB in a still image) of the current moving image content.

  FIG. 2 is a schematic diagram when a color gamut of xvYCC is projected onto a plane. In FIG. 2, a color gamut a is an sRGB color gamut, and a color gamut b is a color gamut expanded by xvYCC. As shown in FIG. 2, in sRGB, only colors expressing R, G, and B as 0 to 1 have been used, whereas in xvYCC, negative values and colors exceeding 1 are defined. Therefore, for example, the receiver 2 performs a process of expanding the video content of the sRGB color gamut a to the color gamut b (hereinafter referred to as “color gamut expansion process”), thereby giving the material feeling and stereoscopic effect of the object. If faithfully reproduced, the user can enjoy a color image with a wide color gamut.

  HDMI, which is the standard for the HDMI cable 3, is upwardly compatible with IEEE 1394, TMDS (Transition Minimized Differential Signaling) for the physical layer, HDCP (High-bandwidth Digital Content Protection) for signal encryption, and inter-device authentication EDID (Extended Display Identification Data) is used, and CEC (Consumer Electronics Control) is used for control system connection of the entire system. Also, the definition of metadata and xvYCC color space is added to HDMI version 1.3. Therefore, for example, if the image data is subjected to the color gamut expansion processing based on the metadata received from the recording / reproducing apparatus 1 and its own color gamut information, more specifically, the inter-device color for the image data. If a space conversion process (Gamut Mapping Algorithm) is performed, correct colors can be reproduced.

  Returning to FIG. 1, the configuration of the playback system will be described. The recording / reproducing apparatus 1 includes a moving picture expert group (MPEG) decoder 11, a video graphic processor 12, a host CPU (Central Processing Unit) 13, an HDMI Tx (transmitter) 14, and an HDMI connector 15. Yes.

  The MPEG decoder 11 includes MPEG1, MPEG2, MPEG4, MPEG4-AVC / H. A video stream such as H.264 is decoded to generate a baseband signal.

  The video graphic processor 12 converts the baseband signal generated by the MPEG decoder 11 into a desired image frame size or synthesizes a plurality of baseband signals.

  The host CPU 13 controls the MPEG decoder 11 and the video graphic processor 12. For example, the MPEG decoder 11 is instructed to decode a desired video stream, and the video graphic processor 12 is instructed to generate a composite image using the decoded baseband signal. Also, the color space standard of the composite image is determined, and the color space information is sent to the HDMI Tx14. The host CPU 13 communicates with the receiver 2 through a DDC (Display Data Channel) line of the HDMI cable 3.

  The HDMI Tx 14 converts attribute data such as a color gamut identification flag indicating the color space standard and metadata sent from the host CPU 13 together with the video / audio signal signal-processed by the video graphic processor 12 into a TMDS signal, Output to the HDMI connector 15. This attribute data can be transmitted using AVI (Auxiliary Video Information) InfoFrame defined in the HDMI standard.

  The HDMI connector 15 is connected to the HDMI cable 3 and transmits a TMDS signal converted by the HDMI Tx 14 to the receiver 2.

  Next, the configuration of the receiver 2 will be described. The receiver 2 includes an HDMI connector 21, an HDMI Rx (receiver) 22, a host CPU 23, an extended display identification data read only memory (EDIDROM) 24, a video graphic processor 25, and a display device 26. Yes.

  The HDMI connector 21 is connected to the HDMI cable 3 and receives a TMDS signal.

  The HDMI Rx 22 acquires a video / audio signal and attribute data from the TMDS signal and sends the video signal to the video graphic processor 25.

  The host CPU 23 controls on / off of the color gamut expansion processing of the video graphic processor 25 based on the attribute data. Specifically, for example, the color space information of the attribute data is ITU-R BT. In the case of 709, the color gamut expansion processing of the video graphic processor 25 is turned on. When the color space information of the attribute data is xvYCC, the color gamut expansion processing of the video graphic processor 25 is turned off.

  The display information of the receiver 2 is stored in the EDIDROM 24. For example, the corresponding resolution information of the receiver 2 and color space information indicating the type of color gamut are written. Display information stored in the EDIDROM 24 is provided to the recording / reproducing apparatus 1 through a DDC (Display Data Channel) line of the HDMI cable 3.

  FIG. 3 is a block diagram showing the configuration of the video graphic processor 25. The video graphic processor 25 includes a memory 251, a scaler 252, a color expander 253, and a video encoder 254. The video signal input from the HDMI Rx 22 is written to the video plane of the memory 251. The video signal written in the memory 251 is read from each plane, and scaled to a desired size by the scaler 252. In addition, color gamut expansion processing is performed by the color expander 253 in response to a command from the host CPU 23. The color expander 253 is, for example, BT. The video signal 709 is expanded to the color gamut of the video signal of xvYCC in a pseudo manner. Further, when the color gamut expansion processing is performed on the xvYCC video signal, the color gamut of the xvYCC video signal is set to be the same as the color gamut of the xvYCC video signal which is pseudo-expanded. The video encoder 254 generates timing, adds a synchronization signal, and the like so as to obtain a desired output specification.

  The display device 26 has a wide color gamut panel and displays a screen processed by the video graphic processor 25.

  As described above, the receiver 2 can faithfully reproduce an object in the screen in the color space of the wide color gamut by turning on / off the color expansion processing according to the attribute data received together with the video / audio signal. .

  By the way, in such a reproduction system, since the receiver 2 switches the color gamut expansion processing according to the color space information, for example, the recording / reproducing apparatus 1 blends a moving image / still image on a background of a certain color graphics, and the background When the color space information is changed depending on the moving image / still image attribute, the graphics color that should be a fixed color in the receiver 2 may change on the display. Hereinafter, a method for preventing such a problem will be described.

  FIG. 4 is a block diagram specifically showing the configuration of the recording / reproducing apparatus 1. The recording / reproducing apparatus 1 includes a line input terminal 41, an analog tuner 42, a disk drive 43, a hard disk drive 44, an IEEE 1394 terminal 45, a digital tuner 46, and an input signal from the line input terminal 41 or the analog tuner 42. A selector 47 for selecting one of them, a video decoder 48 for decoding the video / audio signal from the selector 47, a baseband signal decoded by the video decoder 48, or an image composition by the video graphic processor 54, etc. A selector 49 that selects any one of the baseband signals subjected to signal processing, an MPEG encoder 50 that encodes the baseband signal from the selector 49, an HDV (High-Definition Video) processor 51, and a stream processor 52 And MPE Decoder 53a, and 53b, a video graphic processor 54, an HDMI TX55, a DAC 56, an HDMI connector 57, and a component terminal 58, a composite terminal 59, and a host CPU 60.

  Here, the MPEG decoders 53a and 53b, the video graphic processor 54, the HDMI Tx 55, the HDMI connector 57, and the host CPU 60 are respectively connected to the MPEG decoder 11, the video graphic processor 12, the HDMI Tx 14, the HDMI connector 15 shown in FIG. This corresponds to the host CPU 13.

  Next, a recording operation in the recording / reproducing apparatus 1 will be described. The video signal input from the line input terminal 41 and the video signal output from the analog tuner 42 are input to the video decoder 48 after a desired input is selected by the selector 47. The video decoder 48 A / D converts, for example, an input NTSC analog video signal, separates it into a luminance signal and a chroma signal, and performs a decoding process. The decoded baseband video signal is input to the selector 49 and the video graphic processor 54. After the selector 49 selects either the output from the video decoder 48 or the output from the video graphic processor 54, the selected baseband signal is input to the MPEG encoder 50. MPEG encoder 50 includes MPEG1, MPEG2, MPEG4, MPEG4-AVC / H. H.264 or other desired encoding is performed. The encoded stream is input to the stream processor 52. A stream is sent from the stream processor 52 to a disk drive 43 such as a BD (Blu-ray Disc (trademark)) or a DVD (Digital Versatile Disc), a hard disk drive 44, and the like, and is recorded on a desired medium.

  The stream input from the IEEE 1394 input terminal 45 is input to the stream processor 52 via the HDV processor 51, and the stream from the digital tuner 46 is also input to the stream processor 52. The stream input to the stream processor 52 is recorded on a desired medium such as a disk drive 43 or a hard disk drive 44 such as a BD or a DVD.

  The stream input to the stream processor 52 is subjected to processing such as extraction and parsing of a desired video stream by the stream processor 52, decoding by the MPEG decoder 53, and then passing through the video graphic processor 54 and the selector 49. To the MPEG encoder 50. MPEG encoder 50 includes MPEG1, MPEG2, MPEG4, MPEG4-AVC / H. H.264 or the like is performed, and the encoded stream is input to the stream processor 52. A stream is sent from the stream processor 52 to a disk drive 43 such as a BD or DVD, a hard disk drive 44, or the like, and recorded on a desired medium.

  Next, the reproducing operation in the recording / reproducing apparatus 1 will be described. A stream reproduced by the disk drive 43 or the hard disk drive 44 such as BD or DVD is input to the stream processor 52. The stream processor 52 extracts a desired video stream and parses information related to color space attributes of image data from the stream, and then sends the information to the MPEG decoders 53a and 53b. MPEG decoders 53a and 53b decode image data. The baseband video signal decoded by the MPEG decoders 53a and 53b is input to the video graphic processor 54. The video graphic processor 54 performs conversion processing to a desired image frame size and various video signal processing, synthesizes a graphics signal and the like with the video signal, and then sends them to the HDMI Tx 55. In HDMI Tx55, the input baseband signal is converted into a TMDS signal and output to the HDMI connector 57 together with a control signal. The output of the video graphic processor 54 is input to the DAC 56, and an analog component signal after D / A conversion is output to the component terminal 58, and an analog composite video signal (or Y / C converted) after D / A conversion is output. A separate video signal is also output to the composite video terminal (or S terminal) 59.

  Next, the transmission operation in the recording / reproducing apparatus 1 will be described with reference to FIGS. Here, the stream reproduced by the disk drive 43 or the hard disk drive 44 such as a BD and a DVD includes a wide color gamut video signal, an identification flag for identifying the type of the color gamut, and accompanying information of the color gamut. Assume that metadata is included.

  A stream including the reproduced video / audio signal and metadata such as an identification flag is input to the stream processor 52. The stream processor 52 parses the stream, extracts the identification flag and metadata, and the host CPU 60 acquires the metadata such as the stream identification flag from the stream processor 52. Since the identification flag and the metadata are recorded as additional information of the elementary stream, synchronization with the video signal is always maintained. The stream including the wide color gamut signal is decoded by the MPEG decoders 53a and 53b as described above in the reproduction system, and then sent to the HDMI Tx 55 via the video graphic processor 54.

  Further, the host CPU 60 communicates with the receiver 2 through a DDC (Display Data Channel) line of the HDMI cable 3 connected to the HDMI connector 57, and via the HDMI Rx (receiver) 22 built in the receiver 2 and the host CPU 23. Then, EDID (Extended Display Identification Data) display information written in the ROM 24 is acquired. In the EDID ROM 24, color space information indicating the type of color gamut is written in addition to the corresponding resolution information of the receiver 2. Therefore, the host CPU 60 can determine whether or not the connected receiver 2 supports the wide color gamut video signal by acquiring the display information. When the receiver 2 connected by the HDMI cable 3 is compatible with the wide color gamut video signal, the host CPU 60 transmits the wide color gamut video signal when the color gamut acquired from the disk as an attribute of the video signal. The identification flag and metadata can be set in HDMI Tx55.

  As will be described later, the host CPU 60 acquires the metadata of each image synthesized by the video graphic processor 54 and changes the color gamut identification flag set in the HDMI Tx 55 to a desired value. Specifically, the color gamut identification flag to be set in the HDMI Tx 55 is determined based on the color space standard of each image to be combined and the color space standard before image combination.

  The HDMI Tx 55 converts attribute data such as a color gamut identification flag and metadata into a TMDS signal together with the video / audio signal, and outputs the TMDS signal from the HDMI connector 57. The identification flag and metadata indicating the type of color gamut can be transmitted using AVI (Axialary Video Information) InfoFrame defined in the HDMI standard. For example, the color gamut identification flag is defined by Colorimetry or Extended Colorimetry in the AVI InfoFrame packet. Audio InfoFrame can be used as attribute data of the audio signal.

  FIG. 5 is a functional block diagram of the video graphic processor 54 when compositing images. The video graphic processor 54 includes a memory 541, synthesis processing units 542 a to 542 d, a graphic engine 543, and a JPEG engine 544. Here, the synthesis processing units 542a to 542d are prepared for each output format, and include a scaler 545, a blender 546, and a video encoder 547, respectively.

  The output of the video decoder 48 and the outputs of the MPEG decoders 53a and 53b are written in the video plane of the memory 541. Further, the graphic engine 543 writes graphics data to the graphics plane of the memory 541. The JPEG engine 544 decodes the JPEG file and writes the JPEG data to the video plane in the memory 541. Image data written in the memory 541 is read from each plane, scaled to a desired size by the scaler 545, and sent to the blender 546. The blender 546 combines images read from the planes. The video encoder 547 generates timing, adds a synchronization signal, and the like so as to obtain a desired output specification.

  The operation of the host CPU 60 at the time of image composition processing will be described below with a specific example. As a specific color space standard, BT. 709 and xvYCC (xvYCC709) will be described as a color space standard having a wider color gamut.

  FIG. 6 is a schematic diagram showing the relationship between the color space standard of the video signal and the color space information of the attribute data when screen composition is not performed, that is, when an image having one color space standard is output. At time t0, the color space standard of the video signal is BT. When switching from 709 to xvYCC, the host CPU 60 sets the gamut identification flag to be set in the HDMI Tx55 in synchronization with the color space standard of the video signal. Switch from 709 to xvYCC709. At time t1, the color space standard of the video signal is changed from xvYCC to BT. When switching to 709, the host CPU 60 sets a color gamut identification flag to be set in the HDMI Tx55 in synchronization with the color space standard of the video signal. Switch from 709 to xvYCC709.

  7 to 10 are schematic diagrams illustrating specific examples 1 to 4 of the screen image, the output video signal, and the color space information when performing screen composition. In these specific examples, a video signal of a combined screen in which three images of image a, image b, and image c are combined is output. At time t0 and time t1, the color space standard of the image changes, and the color space standard of the video signal to be output changes accordingly. In these cases, the host CPU 60 fixes and outputs the color space information.

  In the specific example 1 shown in FIG. 7, the BT. 709 image a, BT. A video signal of a composite screen in which three images of image 709 of b 709 and image c of xvYCC are combined is output. At time t0, the color space standard of the video signal of the image a is BT. 709 to xvYCC, and at time t1, the color space standard of the video signal of the image a is changed from xvYCC to BT. 709 has been switched. In this specific example 1, the host CPU 60 always fixes the color gamut identification flag to be set in the HDMI Tx55 to xvYCC 709 regardless of the color space standard of the image to be synthesized. In the first specific example, since the color space information is always fixed to xvYCC 709, not only the color change of the image c having a large area is not caused, but also the influence on the images a and b of the child screen is small, and the color change of the entire composite screen Can be reduced.

  In specific example 2 shown in FIG. 8, before time t0, BT. 709 image a, BT. 709 image b, BT. A video signal of a composite screen in which three images c of image 709 are combined is output. At time t0, the color space standard of the video signal of the image a is BT. 709 to xvYCC, and at time t1, the color space standard of the video signal of the image a is changed from xvYCC to BT. 709 has been switched. In the second specific example, the host CPU 60 always fixes the color gamut identification flag set in the HDMI Tx55 to xvYCC 709 regardless of the color space standard of the image to be synthesized. In specific example 2, since the color space information is always fixed to xvYCC 709, not only the color change of the image c having a large area does not occur, but also the influence on the images a and b of the child screen is small, and the color change of the entire composite screen Can be reduced.

  In specific example 3 shown in FIG. 9, before time t0, BT. 709 image a, BT. A video signal of a composite screen in which three images of image 709 of b 709 and image c of xvYCC are combined is output. At time t0, the color space standard of the video signal of the image a is BT. 709 to xvYCC, and at time t1, the color space standard of the video signal of the image a is changed from xvYCC to BT. 709 has been switched. In this specific example 3, the host CPU 60 always sets the color gamut identification flag to be set in the HDMI Tx 55 regardless of the color space standard of the image to be synthesized. 709 is fixed. In specific example 3, the color space information is always BT. Since it is fixed to 709, not only the color change of the image c having a large area is not caused, but also the influence on the images a and b of the child screen is small, and the color change of the entire combined screen can be reduced.

  In Specific Example 4 shown in FIG. 10, BT. 709 image a, BT. 709 image b, BT. A video signal of a composite screen in which three images c of image 709 are combined is output. At time t0, the color space standard of the video signal of the image a is BT. 709 to xvYCC, and at time t1, the color space standard of the video signal of the image a is changed from xvYCC to BT. 709 has been switched. In this specific example 4, the host CPU 60 always sets the color gamut identification flag to be set in the HDMI Tx 55 regardless of the color space standard of the image to be synthesized. 709 is fixed. In specific example 4, the color space information is always BT. Since it is fixed to 709, not only the color change of the image c having a large area is not caused, but also the influence on the images a and b of the child screen is small, and the color change of the entire combined screen can be reduced.

  Regardless of the color space standard of the screen to be combined in this way, by setting the color gamut identification flag of one color space standard to HDMI Tx55, it is possible to prevent the color from changing on the display when performing screen composition. it can.

  Moreover, it is preferable that the user can select the color space standard when outputting the composite screen. For example, the user can set switching of “wide color gamut setting” = [automatic / off]. In the case of automatic setting, only when the video signal output from the recording / playback apparatus 1 that is the source has a wide color gamut and the receiver 2 that is the sink is an apparatus that can handle the wide color gamut, When color space information is output and set to OFF, BT. 709 is fixed and output.

  Further, for example, the user can set switching of “wide color gamut setting” = [ON / OFF]. In the case of the on setting, when the receiver 2 is a device capable of handling a wide color gamut, the color space information is transmitted with the xvYCC 709 fixed, and in the case of the off setting, the BT. The output is fixed to 709.

  Note that whether or not the receiver 2 as a sink is a device capable of supporting a wide color gamut can be detected by acquiring display information written in the EDID ROM 24 of the receiver 2.

  FIGS. 11 to 15 are schematic diagrams illustrating specific examples 5 to 9 of screen images, output video signals, and color space information in the case of screen composition. In these specific examples, at time t0, a video signal of a screen in which three images a, b, and c are combined is output. Further, the color space standard of the video signal of the image a changes at time t1. In these cases, the host CPU 60 fixes and outputs the color space information at the previous time.

  In Specific Example 5 illustrated in FIG. 11, the video signal of the xvYCC screen is output before time t0. At time t0, the image a, BT. A video signal of a composite screen in which three images of image b of 709 and image c of xvYCC are combined is output, and the color space standard of the video signal of image a is changed from xvYCC to BT. 709 has been switched. In Specific Example 5, the host CPU 60 fixes and outputs the color gamut identification flag set in the HDMI Tx55 to the xvYCC 709 of the video signal output before the video signal of the composite screen. In this specific example 5, for example, when the titles of the image of t0 and the image c are the same and the color space standard of the video signal is also the same, the synthesized screen from the time t0 can be displayed without a sense of incongruity.

  In the specific example 6 shown in FIG. 12, the BT. The video signal of the screen 709 is output. At time t0, the image a, BT. A video signal of a composite screen in which three images of image b of 709 and image c of xvYCC are combined is output, and the color space standard of the video signal of image a is changed from xvYCC to BT. 709 has been switched. In this specific example 6, the host CPU 60 sets the color gamut identification flag to be set in the HDMI Tx55 to the BT. Of the video signal output before the video signal of the composite screen. The output is fixed to 709. In this specific example 6, for example, when the titles of the image of t0 and the image b are the same and the color space standard of the video signal is the same, the composite screen from the time t0 can be displayed without a sense of incongruity.

  In Concrete Example 7 shown in FIG. 13, the video signal of the xvYCC screen is output before time t0. At time t0, the image a, BT. 709 image b, BT. 709. The video signal of the composite screen in which three images c of image 709 are combined is output, and the color space standard of the video signal of image a is changed from xvYCC to BT. 709 has been switched. In this specific example 7, the host CPU 60 fixes and outputs the color gamut identification flag set in the HDMI Tx55 to the xvYCC 709 of the video signal output before the video signal of the composite screen. In the specific example 7, for example, when the titles of the image of t0 and the image a are the same and the color space standard of the video signal is the same, the composite screen from the time t0 can be displayed without a sense of incongruity.

  In Concrete Example 8 shown in FIG. 14, BT. The video signal of the screen 709 is output. At time t0, the image a, BT. 709 image b, BT. 709. The video signal of the composite screen in which three images c of image 709 are combined is output, and the color space standard of the video signal of image a is changed from xvYCC to BT. 709 has been switched. In this specific example 8, the host CPU 60 sets the color gamut identification flag to be set in the HDMI Tx55 to the BT. Of the video signal output before the video signal of the composite screen. The output is fixed to 709. In the specific example 8, for example, when the titles of the image of t0 and the image c are the same and the color space standard of the video signal is the same, the composite screen from the time t0 can be displayed without a sense of incongruity.

  In Specific Example 9 illustrated in FIG. 15, the video signal of the xvYCC screen is output before time t0. At time t0, the image a, BT. A video signal of a composite screen obtained by combining two images 709 of image b is output, and the area of the image a on the screen is changed at time t1. In this specific example 9, the host CPU 60 fixes and outputs the color gamut identification flag set in the HDMI Tx55 to the xvYCC 709 of the video signal output before the video signal of the composite screen. In this specific example 9, for example, when the titles of the image of t0 and the image a are the same and the color space standard of the video signal is also the same, the synthesized screen from the time t0 can be displayed without a sense of incongruity.

  As described above, by maintaining the state of the color space information immediately before the screen composition after the transition to the screen composition mode, it is possible to prevent the color from being changed on the display when the screen composition is performed.

  FIGS. 16 and 17 are schematic diagrams illustrating specific examples 10 and 11 of the screen image, the output video signal, and the color space information when performing screen composition. In these specific examples, at time t0, a video signal of a screen in which three images a, b, and c are combined is output. Further, the color space standard of the video signal of the image a changes at time t1. In these cases, the host CPU 60 matches the color space information with the color space standard of the image having the largest area and size (view angle). The size of each image on the composite screen can be detected by acquiring information from the scaler 545 of the video graphic processor 54.

  In specific example 10 shown in FIG. 16, before time t0, BT. The video signal of the screen 709 is output. At time t0, the image a, BT. A video signal of a composite screen in which three images of image b of 709 and image c of xvYCC are combined is output, and the color space standard of the video signal of image a is changed from xvYCC to BT. 709 has been switched. In this specific example 10, the host CPU 60 outputs the color gamut identification flag set in the HDMI Tx55 as xvYCC 709 of the video signal having the largest area in the image constituting the composite screen. Specifically, at time t0, the host CPU 60 determines that the xvYCC image a and image c scaled to a desired size by the scaler 545 of the video graphic processor 54 are BT. It is determined that the size is larger than the image b of 709, and xvYCC 709 is set to HDMI Tx55. At time t1, the xvYCC image c scaled to a desired size by the scaler 545 of the video graphic processor 54 is BT. It is determined that the image is larger than the image a and the image b in 709, and the xvYCC 709 is set in the HDMI Tx55.

  In Specific Example 11 shown in FIG. 17, the video signal of the xvYCC screen is output before time t0. At time t0, the image a, BT. 709 image b, BT. 709. The video signal of the composite screen in which three images c of image 709 are combined is output, and the color space standard of the video signal of image a is changed from xvYCC to BT. 709 has been switched. In this specific example 11, the host CPU 60 sets the color gamut identification flag to be set in the HDMI Tx 55 to the BT. Of the video signal having the largest area in the image constituting the composite screen. 709 is output. Specifically, the host CPU 60 determines that the BT. Scaled to a desired size by the scaler 545 of the video graphic processor 54 at time t0. 709 is determined to be larger than the image a of xvYCC. 709 is set to HDMI Tx55. At time t1, all BT. 709. Therefore, BT. 709 is set to HDMI Tx55.

  By following the color space information of the video with the largest size and display area of the composite screen in this way, when screen composition is performed, the number of places where the color changes on the display is reduced, thereby preventing unsightly display. it can.

  FIGS. 18 and 19 are schematic diagrams showing specific examples 12 and 13 of screen images, output video signals, and color space information when performing screen composition. In these specific examples, at time t0, a video signal of a screen in which two images of the same size image a and image b are combined is output. Further, the color space standard of the video signal of the image a changes at time t1. In these cases, if the sizes are the same, the host CPU 60 outputs the color space information having the previous time.

  In Concrete Example 12 shown in FIG. 18, the video signal of the xvYCC screen is output before time t0. At time t0, the image a, BT. 709, the video signal of the composite screen in which the two images b are combined, and the color space standard of the video signal of the image a is changed from xvYCC to BT. 709 has been switched. At time t 0, the host CPU 60 sends the xvYCC image a and the BT.s scaled to a desired size by the scaler 545 of the video graphic processor 54. 709 is determined to be equal in size to the image b, and xvYCC 709 of the color space information before the time t0 is set in the HDMI Tx55. At time t1, all BT. 709. Therefore, BT. The identification flag 709 is set in HDMI Tx55.

  In the specific example 13 illustrated in FIG. 19, the xaYCC image a, BT. A video signal obtained by synthesizing two images 709 of image b is output. At time t0, the image a, BT. The size of the two images of the image b of 709 becomes equal, and the color space standard of the video signal of the image a is changed from xvYCC to BT. 709 has been switched. At time t 0, the host CPU 60 sends the xvYCC image a and the BT.s scaled to a desired size by the scaler 545 of the video graphic processor 54. 709 is determined to be equal in size to the image b, and xvYCC 709 of the color space information before the time t0 is set in the HDMI Tx55. At time t1, all BT. 709. Therefore, BT. The identification flag 709 is set in HDMI Tx55.

  In this way, when the size and display area of the composite screen are the same, by retaining the previous color space information, when the screen is composited, the frequency with which the color changes on the display is reduced, thereby preventing unsightly display. be able to.

  20 and 21 are schematic diagrams showing specific examples 14 and 15 of the screen image, the output video signal, and the color space information when screen composition is performed. In these specific examples, the sizes of the combined image a and image b are reversed at times t0 and t1. In these cases, the host CPU 60 determines whether or not to switch the color space information according to the period from time t0 to time t1. Specifically, when the switching period from time t0 to time t1 can be detected in advance, such as when controlling the switching of the image size synthesized by the program, the host CPU 60 compares the detected period with a threshold value. Then, it is determined whether to switch the color space information.

  As a method for detecting the switching period, information stored as a database in the hard disk drive 44 or the like and having color space attributes of image data constituting a title recorded as meta information can be used. Specifically, it is possible to derive the time required from the current reproduction time information and the title meta information to the next occurrence of switching of the color space standard, that is, the period from time t0 to time t1. Further, a section where the color space attribute of the video signal is frequently switched may be detected in advance from the meta information of the title, and the color space attribute may not be switched in the section where the frequency is frequently switched.

  In the specific example 14 illustrated in FIG. 20, the xaYCC image a, BT. A video signal obtained by synthesizing two images 709 of image b is output. At time t0, the image a of xvYCC is BT. 709 and the image a of xvYCC becomes BT. It is larger than the image b of 709. Here, the host CPU 60 compares the detected period with a threshold value, and determines that the detected period is greater than the threshold value. At time t0, the image a and BT.xvYCC scaled to a desired size by the scaler 545 of the video graphic processor 54. Compared with the image b of the image 709, the color space information BT. 709 is set to HDMI Tx55. At time t1, the xvYCC image a and the BT.scale scaled to a desired size by the scaler 545 of the video graphic processor 54 are used. The color space information xvYCC 709 of the image b having a large size (area) is set in the HDMI Tx 55 by comparing the size with the image 709 of the 709.

  In the specific example 15 illustrated in FIG. 21, the xaYCC image a, BT. A video signal obtained by synthesizing two images 709 of image b is output. At time t0, the image a of xvYCC is BT. 709 and the image a of xvYCC becomes BT. It is larger than the image b of 709. Here, the host CPU 60 compares the detected period with a threshold value, and determines that the detected period is smaller than the threshold value. At time t0, the state of the color space information before time t0 is held, and xvYCC 709 is set in HDMI Tx55. At time t1, the xvYCC image a and the BT.scale scaled to a desired size by the scaler 545 of the video graphic processor 54 are used. The color space information xvYCC 709 of the image a having a large size (area) is set in the HDMI Tx55.

  In this way, when the size or display area of the composite screen changes in a short period of time, retaining the previous color space information reduces the frequency with which the color changes on display, thereby preventing unsightly display. it can.

  Further, even if the period from time t0 to time t1 is not detected in advance, the time after the color space switching occurs is counted, and when the next color space switching occurs, the counted predetermined period is Whether or not to switch color space information may be controlled based on whether or not the threshold value is greater than the threshold value.

  FIG. 22 is a schematic diagram showing a specific example 16 of the screen image, the output video signal, and the color space information when screen composition is performed. In this specific example, at time t0, a video signal of a composite screen in which three images of image a, image b, and image c are combined is output, and at time t1, the color space standard of the video signal of image a is changed from xvYCC to BT. . 709 has been switched. Further, the audio signal of the image a is output at time t0, and the audio signal of the image b is output at time t1. In this case, the host CPU 60 outputs the color space information of the image from which the audio signal is output. Specifically, the host CPU 60 selects a video signal of the main image from among a plurality of video signals synthesized by the video graphic processor 54 and sets the audio signal of the video signal in the HDMI Tx 55. The main image is preferably selectable by the user.

  In this way, by using the screen on which the sound is output as the main screen and following the color space information of the video on the main screen, the color of the image that the user is gazing at can be reproduced more vividly.

  Next, another configuration example of the recording / reproducing apparatus 1 will be described with reference to FIGS. FIG. 23 is a block diagram illustrating another configuration of the synthesis processing unit. Note that the same components as those of the synthesis processing unit 542 illustrated in FIG. 5 are denoted by the same reference numerals, and description thereof is omitted here. In the composition processing unit 70, in addition to the function of the composition processing unit 542 shown in FIG. 5, the sRGB color gamut can be expanded to the xvYCC color gamut in a pseudo manner (color gamut expansion processing). In addition, the blend ratio of a plurality of images can be changed.

  The composition processing unit 70 includes a scaler 545, a color expander 71 that performs color gamut expansion processing, a blender 546, and a video encoder 547.

  FIG. 24 is a block diagram illustrating a configuration example of the blender 546. The blender 546 includes three blenders 546a, 546b, and 546c, each having the same function. In this configuration example, any blend synthesis of four input video signals is possible.

  FIG. 25 is a block diagram showing each configuration of the blenders 546a, 546b, and 546c. Each blender 546a, 546b, 546c synthesizes two systems of input signals IN1, IN2 with a blend ratio α. That is, the two images are synthesized with a coefficient (α value). The selector 81 selects the blend ratio α. The selector 81 receives α1 and α2 for each pixel together with the input signal IN1 and the input signal IN2. A control signal αSelect for selecting an α value is input from the host CPU 60 together with a blend ratio αHost in increments of screens, and a desired α value is selected by the αSelect. The difference between the two systems of input signals IN 1 and IN 2 is calculated by the difference unit 82, and the blend ratio α selected by the selector 83 is multiplied by the multiplier 83. The difference multiplied by the blend ratio α is added to the input signal IN1 by the adder 84 and output. That is, the output signal OUT can be calculated by the following equation.

  Returning to FIG. 23, the image data scaled to a desired size by the scaler 545 is sent to the color expander 71. In the color expander 71, as described later, for example, the sRGB color gamut can be expanded into the xvYCC color gamut (color gamut expansion processing). The image data output from the color expander 71 is input to the blender 546, and a plurality of images are synthesized with the blend ratio α. The video encoder 547 generates timing, adds a synchronization signal, and the like so as to obtain a desired output specification.

  Next, a description will be given of a method of performing a pseudo expansion to the xvYCC color gamut by the color expander 71. BT. 601 and BT. In 709, the level of the chroma (Cr, Cb) signal is defined by a value of 16-240. In xvYCC, in order to further expand the color gamut, a signal level of a value of 1-254 can be handled. When this is converted into a pseudo xvYCC signal, the signals up to 36-220 are passed as they are, and the signals of 16-36 and 221-240 are respectively subjected to level conversion (level expansion) by linear processing. The 36 signal is converted into a 1-36 signal and the 221-240 signal is converted into a 221-254 signal. As a result, the color signal having a relatively high saturation of the source signal is further expanded to generate a pseudo xvYCC signal. Similarly, Cb can be expanded. Note that the same color gamut expansion may be performed with RGB signals. Further, the level threshold value may be changed, and the same effect can be obtained by non-linear processing of level conversion.

  Further, another method for expanding to the xvYCC color gamut will be described below. As described in the document “Recent Trend of Wide Gamut Standards for Color Imaging” (by T. Matsumoto et al.) At the 2006 International Display Workshops (IDW) meeting, Y′709, R ′, G ′, B ′ A conversion formula to Cb′709 and Cr′709 is expressed by Formula (1). Moreover, Formula (2) is obtained from Formula (1).

  BT. In the color gamut 709, the condition of the expression (3) needs to be satisfied. For example, when the condition of Cb = Cr is further added (assuming that Cb = Cr = C), the conditional expression of Expression (4) is obtained from Expression (2) and Expression (3).

  FIG. 26 shows BT. FIG. 6 is a schematic diagram showing a color gamut of 709 on the Y-Cb, Cb space. This diamond-shaped BT. The signal near the boundary of the color gamut area 709 is expanded to the area outside the boundary (color gamut expansion processing). Note that the BT. The signal near the boundary of the color gamut 709 may be expanded (color gamut expansion processing).

  In this way, BT. By converting a color gamut such as 709 to a wide color gamut such as xvYCC, color space information transmitted by HDMI can always be output with xvYCC 709 fixed. Further, since the color space information is not switched, it is possible to prevent the color from being changed on display.

  Contrary to the above operation, even when a wide color gamut signal is input, BT. 709, compressed to narrow color space information of sRGB, always BT. The color space information such as 709 may be fixedly output.

  FIG. 27 is a block diagram illustrating a configuration example of a composition processing unit when color space information is compressed. Note that the same components as those of the synthesis processing unit 542 illustrated in FIG. 5 are denoted by the same reference numerals, and description thereof is omitted here. In the composition processing unit 90, in addition to the function of the composition processing unit 542 shown in FIG. It is possible to perform compression processing in the 709 color gamut. In addition, the blend ratio of a plurality of images can be changed.

  The color compressor 91 is BT. 709 color gamut signal is output as it is, and xvYCC color gamut signal is output as BT. Compressed to 709 and output.

  As a result, the color space information is always BT. Since the output is fixed at 709 and the color space information is not switched, it is possible to prevent the color from changing on the display.

  28 and 29 are schematic diagrams showing specific examples 17 and 18 of screen images, output video signals, and color space information when performing screen composition. In these specific examples, the GUI front image is combined with the back image by the blend ratio α. At time t0 and t1, the color space standard of the back image is switched. In these cases, the host CPU 60 acquires the blend ratio α from the blenders 546a, 546b, and 546c, and determines whether or not to switch the color space information according to the blend ratio α. Specifically, when the α value of the front screen (GUI) to be blended is 50% or more, the color space information of the front screen (GUI) is output.

  In Specific Example 17 shown in FIG. 28, the xvYCC GUI front image is blended with the back image with an α value of 50% or more. At time t0, BT. The back image of 709 is switched to the back image of xvYCC, and at time t1, the back image of xvYCC is BT. The back image of 709 is switched. The host CPU 60 detects that the blend ratio α is 50% or more, and sets the color space information xvYCC 709 of the front image in the HDMI Tx55.

  In the specific example 18 shown in FIG. A GUI front image 709 is blended with a back image with an α value of 50% or more. At time t0, BT. The back image of 709 is switched to the back image of xvYCC, and at time t1, the back image of xvYCC is BT. The back image of 709 is switched. The host CPU 60 detects that the blend ratio α is 50% or more and detects the color space information BT. 709 is set to HDMI Tx55.

  As described above, when the blend ratio α is 50% or more, by transmitting the color space information of the front image, the frequency of the front image color changing on the display is reduced, so that it is possible to prevent unsightly display. .

  30 to 32 are schematic diagrams illustrating specific examples 19 to 21 of the screen image, the output video signal, and the color space information when performing screen composition. In these specific examples, the GUI front image is combined with the back image at time t1. In these cases, the host CPU 60 holds the state of the color space information immediately before screen composition.

  In the specific example 19 shown in FIG. 30, the video signal of the xvYCC color space standard is output at a time before the time t0. At time t0, the GUI front image of xvYCC is blended with the back image of xvYCC. At time t1, the back image of xvYCC is BT. The back image of 709 is switched. In this case, the host CPU 60 holds the color space information of the immediately preceding image at time t0, and sets xvYCC 709 to HDMI Tx55. At time t1, the previous color space information is held, and xvYCC 709 is set in HDMI Tx55.

  In the specific example 20 shown in FIG. 31, at the time before the time t0, the BT. A video signal of 709 color space standard is output. At time t0, the GUI front image of xvYCC is blended with the back image of xvYCC. At time t1, the back image of xvYCC is BT. The back image of 709 is switched. In this case, the host CPU 60 holds the color space information of the immediately preceding image at time t0, and the BT. 709 is set to HDMI Tx55. At time t1, the previous color space information is held, and BT. 709 is set to HDMI Tx55.

  In the specific example 21 shown in FIG. 32, at the time before the time t0, the BT. A video signal of 709 color space standard is output. At time t0, the GUI table image of xvYCC is BT. The back image of 709 is blended. At time t1, the video signal is switched to an xvYCC image. In this case, the host CPU 60 holds the color space information of the immediately preceding image at time t0, and the BT. 709 is set to HDMI Tx55. At time t1, since it is not a composite image, xvYCC 709, which is the color space of the image, is set in HDMI Tx55.

  When screen composition is performed by blending in this way, it is possible to prevent the color from being changed on display by maintaining the state of the color space information immediately before performing screen composition.

  As described above in detail, when the screen is synthesized, the color space information to be transmitted by HDMI is fixed, so that the receiver or the like that switches the color gamut expansion processing according to the color space information can be used for graphics and composite images. The problem that the color changes on display can be avoided.

  In addition, by retaining the color space information before the screen is synthesized and transmitting the color space information after the screen is synthesized, the receiver or the like that switches the color gamut expansion processing according to the color space information can be used. The problem that the color changes on display can be avoided.

  In addition, when the color space information to be transmitted by HDMI is determined according to the size and area of the composite screen, the color of graphics or the composite image changes on the display side on the receiver side that switches the color gamut expansion processing according to the color space information. Moreover, the change can be made inconspicuous visually.

  Also, when determining the color space information to be transmitted by HDMI according to the size and area of the composite screen, if the size and area are the same, the color space expansion is performed according to the color space information by holding and transmitting the previous color space information. Even when the color of graphics or composite image changes on the display side at the receiver side where the processing is switched, the change can be made visually inconspicuous.

  In addition, when performing screen composition of the entire screen by alpha blending, color space information according to the color space information is transmitted by transmitting color space information of the front screen (GUI) having a minimum alpha value of 50% or more in the screen. It is possible to avoid the problem that the color of graphics or composite image changes on display at the receiver side where the expansion process is switched.

  Further, when determining color space information to be transmitted by HDMI according to the size and area of the composite screen, if the switching interval is equal to or less than a predetermined time, the previous color space information is retained and transmitted, and the color space information is transmitted. Even when the color of graphics or composite image changes on the display side on the receiver side where the color gamut expansion processing is switched, the change can be made visually inconspicuous.

  Also, when synthesizing a screen, color gamut expansion processing is performed on the normal gamut signal to generate and synthesize a pseudo wide gamut signal, and the color space information transmitted by HDMI is fixed to the wide gamut. Thus, it is possible to avoid the problem that the color of graphics or the synthesized image changes on the display side on the receiver side where the color gamut expansion processing is switched according to the color space information.

  Also, when synthesizing a screen, color gamut compression processing is performed on a wide color gamut signal, a normal color gamut signal is generated and synthesized, and color space information transmitted by HDMI is fixed to the normal color gamut. Thus, it is possible to avoid the problem that the color of graphics or the synthesized image changes on the display side on the receiver side where the color gamut expansion processing is switched according to the color space information.

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, in the above embodiment, the transmission example using HDMI has been described, but the present invention is not limited to this. Although attribute data such as a color gamut identification flag and metadata cannot be transmitted, for example, from a component terminal 58 and a composite video terminal (or S terminal) 59, a wide color gamut analog component signal and analog composite video signal ( Alternatively, the Y / C separate video signal may be output, and the host CPU 60 may communicate with the host CPU 23 of the receiver 2 using, for example, TCP / IP (Transmission Control Protocol / Internet Protocol).

It is a figure which shows the reproduction | regeneration system which concerns on one embodiment of this invention. It is a schematic diagram at the time of projecting the color gamut of xvYCC on a plane. It is a block diagram which shows the structure of a video graphic processor. It is a block diagram which shows the structure of a recording / reproducing apparatus concretely. It is a functional block diagram of a video graphic processor when combining images. It is a schematic diagram which shows the relationship between the color space standard of a video signal and the color space information of attribute data in the case of outputting the image which consists of one color space standard. It is a schematic diagram which shows the specific example 1 of the screen image in the case of performing a screen synthesis | combination, an output video signal, and color space information. It is a schematic diagram which shows the specific example 2 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a schematic diagram which shows the specific example 3 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a schematic diagram which shows the specific example 4 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a schematic diagram which shows the specific example 5 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a schematic diagram which shows the specific example 6 of the screen image in the case of performing a screen synthesis | combination, an output video signal, and color space information. It is a schematic diagram which shows the specific example 7 of the screen image in the case of performing a screen synthesis | combination, an output video signal, and color space information. It is a schematic diagram which shows the specific example 8 of the screen image in the case of performing a screen synthesis | combination, an output video signal, and color space information. It is a schematic diagram which shows the specific example 9 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a schematic diagram which shows the specific example 10 of the screen image in the case of performing a screen synthesis | combination, an output video signal, and color space information. It is a schematic diagram which shows the specific example 11 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a schematic diagram which shows the specific example 12 of the screen image in the case of performing a screen synthesis | combination, an output video signal, and color space information. It is a schematic diagram which shows the specific example 13 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a schematic diagram which shows the specific example 14 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a schematic diagram which shows the specific example 15 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a schematic diagram which shows the specific example 16 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a block diagram which shows the other structure of a synthetic | combination process part. It is a block diagram which shows the structural example of a blender. It is a block diagram which shows each structure of a blender. BT. FIG. 6 is a schematic diagram showing a color gamut of 709 on the Y-Cb, Cb space. It is a block diagram which shows the structural example of the synthetic | combination process part in the case of compressing color space information. It is a schematic diagram which shows the specific example 17 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a schematic diagram which shows the specific example 18 of the screen image in the case of performing a screen synthesis | combination, an output video signal, and color space information. It is a schematic diagram which shows the specific example 19 of the screen image in the case of performing a screen composition, an output video signal, and color space information. It is a schematic diagram which shows the specific example 20 of the screen image in the case of performing a screen synthesis | combination, an output video signal, and color space information. It is a schematic diagram which shows the specific example 21 of the screen image in the case of performing a screen composition, an output video signal, and color space information.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Recording / reproducing apparatus, 2 Receiver, 3 HDMI cable, 11 MPEG decoder, 12 Video graphic processor, 13 Host CPU, 14 HDMI Tx, 15 HDMI connector, 21 HDMI connector, 22 HDMI Rx, 23 Host CPU, 24 EDIDROM 25 video graphics processor 26 display device 41 line input terminal 42 analog tuner 43 disk drive 44 hard disk drive 45 IEEE 1394 input terminal 46 digital tuner 47 selector 48 video decoder 49 selector 50 MPRG Encoder, 51 HDV processor, 52 stream processor, 53 MPEG decoder, 54 Video Graphics Processor

Claims (11)

An image processing apparatus that performs signal processing on an image signal of a first color space standard and an image signal of a second color space standard having a color gamut wider than the color gamut defined by the first color space standard,
Image processing means for combining a plurality of image signals and generating a combined image signal;
Control means for determining color space information of the composite image signal to be either the first color space standard or the second color space standard;
Transmission means for transmitting the composite image signal and the determined color space information according to a predetermined digital video signal transmission standard,
The control means is configured to determine a color space standard of the plurality of image signals synthesized by the image processing means and at least one of the color space information transmitted before switching to the synthesized image signal. An image processing apparatus for determining color space information.   The control means determines the color space standard of the image signal synthesized so as to have the largest screen size among the color space standards of the plurality of image signals synthesized by the image processing means. The image processing apparatus according to claim 1.   3. The control unit according to claim 2, wherein when a plurality of image signals synthesized by the image processing unit have the same screen size, the control unit determines a color space standard before the synthesized image signal is transmitted. Image processing apparatus.   The image processing apparatus according to claim 1, wherein the control unit determines a color space standard of the combined image signal based on a combining ratio of the two images combined by the image processing unit.   2. The image according to claim 1, wherein the control means determines the color space standard of the color space information transmitted before switching to the composite image signal when the switching interval of the color space information is a predetermined time or less. Processing equipment. The image processing means expands the image signal of the first color space standard so as to be a pseudo second color space standard;
The image processing apparatus according to claim 1, wherein the control unit determines the second color space standard.   The control means determines the color space standard of the color space information transmitted before switching to the composite image signal when the color space standards of the plurality of image signals synthesized by the image processing means are different. The image processing apparatus according to claim 1. Selecting means for selecting an image signal of a main image among a plurality of image signals synthesized by the image processing means;
The image processing apparatus according to claim 1, wherein the control unit determines a color space standard of the image signal of the main image.   The image processing apparatus according to claim 8, wherein the main image is an image from which sound is output. The image processing means compresses the image signal of the second color space standard so as to be a pseudo first color space standard,
The image processing apparatus according to claim 1, wherein the control unit determines the first color space standard. An image processing method for performing signal processing on an image signal of a first color space standard and an image signal of a second color space standard having a color gamut wider than the color gamut defined by the first color space standard,
An image processing step of combining a plurality of image signals and generating a combined image signal;
A control step of determining the color space information of the composite image signal as either the first color space standard or the second color space standard;
A transmission step of transmitting the composite image signal and the determined color space information according to a predetermined digital video signal transmission standard;
In the control step, a color space standard of a plurality of image signals synthesized by the image processing means, and color space information transmitted before switching to the synthesized image signal, the synthesized image signal An image processing method characterized by determining color space information.

Images