JP2007312085A - Video processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video processor which is adaptive to a plurality of systems related to video signals while reducing the number of terminals and the scale of a video processing circuit. <P>SOLUTION: The video processor includes a plurality of input ports to which video signals are input, a plurality of color format converters as many as the plurality of input ports are provided and convert color formats of the video signals, and a video signal selector which is connected to the plurality of input ports and the plurality of color format converters and generates a video signal corresponding to the input format of a color format converter from a video signal selected out of the plurality of video signals input to the plurality of input ports. The video signal selector has a plurality of resolution converters which are as many as the plurality of color format converters and connected to all of the plurality of input ports, and the plurality of resolution converters each generate a video signal of resolution corresponding to the input format of a color format converter from a video signal selected out of the plurality of video signals input to the plurality of input ports. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a video processing apparatus that supports a plurality of methods related to video signals.

  The transfer amount and transfer speed of the video signal increase as the video resolution increases. In particular, the analog transfer method is susceptible to noise and requires a highly accurate A / D conversion, and therefore tends to be reduced. However, the analog transfer method is widely used even now because it has been widely used and the number of signal lines required is small.

  On the other hand, in the digital transfer method, since a digital video signal is transferred, there is no need to convert the signal format. A digital parallel transfer method is used for short-distance transfer and transfer on a substrate. However, since it becomes difficult to match the timing when the transfer speed is increased, measures such as increasing the data width are taken when transferring a high-resolution video. However, in the case of long-distance transfer, a differential serial transfer method is generally used because of timing constraints, deterioration due to noise, and an increase in data width. At present, these transfer methods are mixed in various video devices.

  There are mainly RGB and YCbCr formats (also referred to as YUV formats) as video signal color formats, which are used according to the characteristics of the video source. Further, depending on the accuracy of the video, it is classified into formats such as RGB 32-bit, RGB 16-bit, YCbCr 4: 2: 2, YCbCr 4: 4: 4, etc., with different numbers of bits and ratios of elements.

  Due to the diversification of video signals described above and the recent development of multimedia, multiple video images with different methods such as the number of video signal channels, data format, color format, and bit number can be displayed and switched on one screen. There is a demand for a video processing apparatus that can be displayed. Usually, the video processing apparatus includes an interface corresponding to a specific method. Even though the interface is optimal for this particular scheme, it may not be appropriate for another scheme. For this reason, there is known a video processing apparatus that can be retrofitted with an interface that is optimal for another system. However, such a video processing apparatus has a problem that the number of terminals for inputting and outputting video signals is increased and the scale of the video processing circuit is increased corresponding to a plurality of systems.

  An object of the present invention is to provide a video processing apparatus capable of supporting a plurality of systems related to video signals while suppressing the number of terminals and the scale of a video processing circuit.

  The present invention provides a plurality of input ports to which a video signal is input, a plurality of color format conversion units for converting the color format of the video signal provided in the same number as the plurality of input ports, the plurality of input ports, A video signal that is connected to a plurality of color format conversion units and generates a video signal corresponding to the input format of the color format conversion unit from a selected video signal among a plurality of video signals input to the plurality of input ports And a selection unit.

  In the video processing device, the video signal selection unit is provided in the same number as the plurality of color format conversion units, and has a plurality of resolution conversion units connected to all of the plurality of input ports, and the plurality of resolution conversions Each of the units may generate a video signal having a resolution corresponding to an input format of the color format conversion unit from a video signal selected from the plurality of video signals input to the plurality of input ports.

  In the video processing device, at least one of the plurality of resolution conversion units selects at least one video signal according to each type of the plurality of video signals input to the plurality of input ports. Also good.

  In the video processing apparatus, each of the plurality of resolution conversion units is independently connected to one of the plurality of color format conversion units, and selects any of the plurality of video signals input to the plurality of input ports. The resolution conversion unit that does not perform and the color format conversion unit connected to the non-selected resolution conversion unit may stop each operation.

  The video processing apparatus may include a video synthesis unit that generates a single video by synthesizing a plurality of videos according to the video signals obtained by the plurality of color format conversion units.

  In the video processing apparatus, each video signal obtained by the plurality of color format conversion units may be output to different devices.

  The video processing device controls data transfer from each of the plurality of color format conversion units to a memory shared and used by the plurality of color format conversion units, and the data transferred from each color format conversion unit You may provide the memory control part which controls the storage area in memory.

  In the video processing apparatus, the color format conversion unit may convert the YCbCr signal into an RGB signal.

  In the video processing apparatus, the plurality of resolution conversion units may sequentially capture video signals input from the plurality of input ports in a time division manner, and the plurality of color format conversion units may process in parallel.

  ADVANTAGE OF THE INVENTION According to this invention, the video processing apparatus which can respond | correspond to the several system which concerns on a video signal, suppressing the number of terminals and the scale of a video processing circuit can be provided.

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

(First embodiment)
FIG. 1 is a block diagram illustrating a configuration of a video processing apparatus according to the first embodiment. As shown in FIG. 1, the video processing apparatus 100 according to the first embodiment includes input ports 101a to 101c, a video signal selection unit 103, video processing units 105a to 105c, a video synthesis unit 107, and a post-processing unit. 109 and a memory control unit 111.

  Each of the input ports 101a to 101c is a terminal to which an 8-bit digital video signal is input. The 8-bit digital video signal is, for example, an 8-bit YCbCr 4: 2: 2 video signal. The video signal selection unit 103 selects a video signal input from the input ports 101a to 101c, and generates a 24-bit digital video signal from the selected video signal. The 24-bit digital video signal is, for example, a 24-bit YCbCr 4: 4: 4 video signal.

  As shown in FIG. 1, the video signal selection unit 103 has the same number of resolution conversion units 151a to 151c as the input ports 101a to 101c. Each resolution conversion unit 151 is connected to all of the input ports 101a to 101c. Each resolution conversion unit 151 selects and captures video signals input from the input ports 101a to 101c. Note that each resolution conversion unit 151 can capture all of the video signals input from the input ports 101a to 101c, or can capture only a portion of the video signals. At least one of the resolution converters 151a to 151c generates and outputs a 24-bit digital video signal from the captured video signal. The 24-bit digital video signal output from each resolution conversion unit 151 is a signal input format to the video processing units 105a to 105c set in advance.

  Each of the video processing units 105 a to 105 c includes a color format conversion unit 153. The video signal output from the resolution converter 151a is input to the color format converter 153a of the video processor 105a, and the video signal output from the resolution converter 151b is input to the color format converter 153b of the video processor 105b. The video signal output from the resolution converter 151c is input to the color format converter 153c of the video processor 105c. Each color format conversion unit 153 converts the color format of the input video signal to another color format. In the present embodiment, each color format conversion unit 153 converts the input YCbCr signal into an RGB signal. When an RGB signal is input, each color format conversion unit 153 may convert the RGB signal into a YCbCr signal.

  The memory interface 155 is an interface between the memory 171 provided outside the video processing apparatus 100 of this embodiment and the video processing apparatus 100, and is provided in each of the video processing units 105a to 105c. The memory 171 is shared and used by the video processing units 105a to 105c. When processing using the memory 171 occurs during the color format conversion performed by the color format conversion unit 153, the color format conversion unit 153 accesses the memory 171 via the memory interface 155.

  The video synthesizing unit 107 synthesizes each video indicated by the plurality of video signals converted by the color format conversion units 153a to 153c to generate one synthesized video. Note that the video composition unit 107 may include a line buffer and a frame buffer. The post-processing unit 109 performs a process for displaying the synthesized video generated by the video synthesizing unit 107 on a monitor 173 provided outside the video processing apparatus 100.

  The memory control unit 111 controls data transfer from each video processing unit 105 to the memory 171, and controls a storage area in the memory 171 that stores data transferred from each video processing unit 105 via the memory interface 155. . The data is video data indicated by the video signal converted by the color format conversion unit 153.

  The resolution conversion unit that does not take in the video signals input to the input ports 101a to 101c and the video processing unit corresponding to the resolution conversion unit automatically stop each operation or perform each operation by external control. Stopped. The video processing unit that stops the operation notifies the memory control unit 111 that the access right to the memory 171 is abandoned. In this case, other video processing units can use more storage areas of the memory 171.

(First embodiment)
With reference to FIG. 2 and FIG. 3, the operation of the video processing apparatus 100 of this embodiment when an 8-bit YCbCr 4: 2: 2 video signal is input to the input ports 101a to 101c, respectively. FIG. 2 is an explanatory diagram showing an 8-bit YCbCr4: 2: 2 video signal and a 24-bit YCbCr4: 4: 4 video signal. FIG. 3 is an explanatory diagram showing processing of the video processing apparatus 100 to which an 8-bit YCbCr 4: 2: 2 video signal is input.

  As shown in FIG. 3, when an 8-bit YCbCr4: 2: 2 video signal is input to each of the input ports 101a to 101c, the resolution conversion unit 151a takes in the video signal from the input port 101a (ON) and inputs the input port. The video signals from 101b and 101c are not captured (OFF). The resolution converter 151b captures the video signal from the input port 101b and does not capture the video signal from the input ports 101a and 101c. The resolution converter 151c captures the video signal from the input port 101c, and does not capture the video signal from the input ports 101a and 101b.

  The resolution converter 151a generates a 24-bit YCbCr4: 4: 4 video signal from the 8-bit YCbCr4: 2: 2 video signal input to the input port 101a, and outputs this to the video processor 105a. The resolution converter 151b generates a 24-bit YCbCr4: 4: 4 video signal from the 8-bit YCbCr4: 2: 2 video signal input to the input port 101b, and outputs this to the video processor 105b. The resolution converter 151c generates a 24-bit YCbCr4: 4: 4 video signal from the 8-bit YCbCr4: 2: 2 video signal input to the input port 101c, and outputs this to the video processor 105c.

  Each color format conversion unit 153 converts the color format of the 24-bit YCbCr 4: 4: 4 video signal to the RGB format. The video synthesis unit 107 synthesizes the video signals output from the video processing units 105 to generate one synthesized video. The video signal indicating the composite video is sent to the post-processing unit 109, and after being processed by the post-processing unit 109, the composite video is displayed on the monitor 173.

  Note that the synthesized video is not limited to a video obtained by synthesizing the video signals output from all the video processing units 105a to 105c, but may be a video obtained by selecting and synthesizing video signals output from some video processing units. good. For example, it may be a video obtained by synthesizing video signals output from any two or one video processing units selected from the video processing units 105a to 105c. Furthermore, the selected video processing unit may be switched in accordance with an operation by the user.

(Second embodiment)
4 and 5, the 16-bit YCbCr4: 2: 2 video signal is input to the input ports 101a and 101b and the 8-bit YCbCr4: 2: 2 video signal is input to the input port 101c. An operation of the video processing apparatus 100 according to the embodiment will be described. FIG. 4 is an explanatory diagram showing a 16-bit YCbCr4: 2: 2 video signal and a 24-bit YCbCr4: 4: 4 video signal. FIG. 5 is an explanatory diagram showing processing of the video processing apparatus 100 to which a 16-bit YCbCr4: 2: 2 video signal and an 8-bit YCbCr4: 2: 2 video signal are input.

  As shown in FIG. 5, an 8-bit luminance (Y) signal is input to the input port 101a, an 8-bit color difference (CbCr) signal is input to the input port 101b, and an 8-bit YCbCr 4: 2: 2 video signal is input to the input port 101c. Is input, the resolution converter 151a takes in the video signals from the input ports 101a and 101b (ON) and does not take in the video signals from the input port 101c (OFF). The resolution conversion unit 151b does not capture any video signal from the input ports 101a to 101c. The resolution converter 151c captures the video signal from the input port 101c, and does not capture the video signal from the input ports 101a and 101b.

  The resolution conversion unit 151a generates a 24-bit YCbCr4: 4: 4 video signal from the 8-bit luminance signal input to the input port 101a and the 8-bit color difference signal input to the input port 101b, and outputs this to the video processing unit 105a. Output to. Since the resolution conversion unit 151b does not capture any video signal, the resolution conversion unit 151b and the video processing unit 105b stop each operation. The resolution converter 151c generates a 24-bit YCbCr4: 4: 4 video signal from the 8-bit YCbCr4: 2: 2 video signal input to the input port 101c, and outputs this to the video processor 105c.

  The color format conversion units 153a and 153c convert the color format of the 24-bit YCbCr4: 4: 4 video signal to the RGB format. The video synthesizing unit 107 synthesizes the video signals output from the video processing units 105a and 105c to generate one synthesized video. The video signal indicating the composite video is sent to the post-processing unit 109, and after being processed by the post-processing unit 109, the composite video is displayed on the monitor 173.

(Third embodiment)
With reference to FIGS. 6 and 7, the operation of the video processing apparatus 100 of the present embodiment when a 24-bit YCbCr 4: 4: 4 video signal is input to the input ports 101a to 101c will be described. FIG. 6 is an explanatory diagram showing a 24-bit YCbCr 4: 4: 4 video signal. FIG. 7 is an explanatory diagram showing processing of the video processing apparatus 100 to which a 24-bit YCbCr 4: 4: 4 video signal is input.

  As shown in FIG. 7, an 8-bit luminance (Y) signal is input to the input port 101a, an 8-bit color difference (Cb) signal is input to the input port 101b, and an 8-bit color difference (Cr) signal is input to the input port 101c. When this is done, the resolution converter 151a takes in all the video signals from the input ports 101a to 101c (ON). The resolution converters 151b and 151c do not capture any video signals from the input ports 101a to 101c (OFF).

  The resolution converter 151a generates a 24-bit YCbCr4: 4: 4 video signal from the 8-bit luminance signal input to the input port 101a and the 8-bit color difference signals input to the input ports 101b and 101c, and converts the generated video into a video. The data is output to the processing unit 105a. Since the resolution converters 151b and 151c do not capture any video signal, the resolution converters 151b and 151c and the video processors 105b and 105c stop their operations.

  The color format conversion unit 153a converts the color format of the 24-bit YCbCr 4: 4: 4 video signal to the RGB format. The video composition unit 107 sends the video signal output from the video processing unit 105 a to the post-processing unit 109. After the video signal is processed by the post-processing unit 109, the video is displayed on the monitor 173.

(Fourth embodiment)
With reference to FIGS. 8 and 9, the operation of the video processing apparatus 100 of the present embodiment when a 24-bit RGB video signal is input to the input ports 101a to 101c will be described. FIG. 8 is an explanatory diagram showing a 24-bit RGB video signal. FIG. 9 is an explanatory diagram showing processing of the video processing apparatus 100 to which a 24-bit RGB video signal is input.

  As shown in FIG. 9, when an 8-bit R signal is input to the input port 101a, an 8-bit G signal is input to the input port 101b, and an 8-bit B signal is input to the input port 101c, the resolution converter 151a All the video signals from the input ports 101a to 101c are taken in (ON). The resolution converters 151b and 151c do not capture any video signals from the input ports 101a to 101c (OFF).

  The 24-bit RGB video signal input to the input ports 101a to 101c is input to the video processing unit 105a via the resolution conversion unit 151a. The color format conversion unit 153a converts the 24-bit RGB video signal to a 24-bit YCbCr 4: 4: 4 video signal as necessary. The subsequent steps are the same as in the first embodiment.

  In the present embodiment, the resolution conversion units 151a to 151c and the video processing units 105a to 105c operate independently of each other. Therefore, it is possible to provide a video processing apparatus that supports a plurality of methods related to video signals without adding an additional interface. Therefore, the number of terminals and the scale of the video processing circuit can be suppressed. Furthermore, only a part of the plurality of video signals input to the input ports 101a to 101c can be displayed on the monitor 173.

  The video processing apparatus 100 of this embodiment includes three sets of input ports, resolution conversion units, and video processing units, but is not limited to three sets. In addition, although it has been described that an 8-bit digital video signal is input to each of the input ports 101a to 101c, it is not limited to 8 bits. Further, although the video signal selection unit 103 has been described as outputting a 24-bit digital video signal, the video signal selection unit 103 is not limited to 24 bits. Further, although it has been described that the memory 171 is provided outside the video processing apparatus 100, the memory 171 may be provided inside the video processing apparatus 100. In the above embodiment, all the video signals output from the video processing units 105a to 105c are input to the video synthesis unit 107. However, each video signal may be output to a different device. Further, a plurality of monitors 173 may be provided, and the post-processing unit 109 may output a video signal of the composite video to each monitor. Further, the output destination of the video signal from the post-processing unit 109 is not limited to the monitor 173, and may be another device.

(Second Embodiment)
In the first embodiment, the mode in which one video signal is processed by one resolution conversion unit and video processing unit has been described. In the second embodiment, one video signal is processed by a plurality of resolution conversion units and video processing units. Note that since the configuration of the video processing apparatus of the second embodiment is the same as that of the first embodiment, illustration and description of each component are omitted.

  In the present embodiment, the resolution converters 151a to 151c sequentially take in video signals input to any of the input ports 101a to 101c in a time division manner. The minimum unit for switching the video signal is one pixel, and the maximum unit is one line. The video signal captured by the resolution conversion unit 151 is processed by the video processing unit 105 corresponding to the resolution conversion unit and arranged on the video synthesis unit 107 or the memory.

  When switching in units of one pixel, one video signal is processed by a plurality of resolution conversion units and a plurality of video processing units, so that the video processing device needs to process a video signal having a huge amount of data. However, it is not necessary to increase the processing capability of the video signal selection unit 103 and each video processing unit 105. Further, when switching line units, video processing with reference to the previous and subsequent lines can be performed by storing the previous line information in the memory 171.

1 is a block diagram illustrating a configuration of a video processing apparatus according to a first embodiment. Explanatory diagram showing 8-bit YCbCr4: 2: 2 video signal and 24-bit YCbCr4: 4: 4 video signal Explanatory drawing which shows the process of the video processing apparatus into which 8-bit YCbCr4: 2: 2 video signal is input Explanatory drawing showing a 16-bit YCbCr4: 2: 2 video signal and a 24-bit YCbCr4: 4: 4 video signal Explanatory drawing which shows the process of the video processing apparatus into which a 16-bit YCbCr4: 2: 2 video signal and an 8-bit YCbCr4: 2: 2 video signal are input Explanatory drawing showing a 24-bit YCbCr4: 4: 4 video signal Explanatory drawing which shows the process of the video processing apparatus into which a 24-bit YCbCr4: 4: 4 video signal is input Explanatory drawing showing a 24-bit RGB video signal Explanatory drawing which shows the process of the video processing apparatus into which a 24-bit RGB video signal is input

Explanation of symbols

100 Video processing apparatus 101a to 101c Input port 103 Video signal selection unit 105a to 105c Video processing unit 107 Video composition unit 109 Post processing unit 111 Memory control unit 151a to 151c Resolution conversion unit 153a to 153c Color format conversion unit 155a to 155c Memory interface 171 Memory 173 Monitor

Claims (9)

A plurality of input ports to which video signals are input;
A plurality of color format converters for converting the color format of the video signal provided in the same number as the plurality of input ports;
Connected to the plurality of input ports and the plurality of color format conversion units, corresponding to the input format of the color format conversion unit from the selected video signal among the plurality of video signals input to the plurality of input ports A video signal selector for generating a video signal;
A video processing apparatus comprising: The video processing apparatus according to claim 1,
The video signal selection unit is provided in the same number as the plurality of color format conversion units, and has a plurality of resolution conversion units connected to all of the plurality of input ports,
Each of the plurality of resolution conversion units generates a video signal having a resolution corresponding to the input format of the color format conversion unit from a video signal selected from the plurality of video signals input to the plurality of input ports. A video processing apparatus characterized by: The video processing apparatus according to claim 2,
At least one of the plurality of resolution conversion units selects at least one video signal in accordance with each type of the plurality of video signals input to the plurality of input ports. apparatus. The video processing apparatus according to claim 2,
The plurality of resolution conversion units are each independently connected to one of the plurality of color format conversion units,
The resolution conversion unit that does not select any of the plurality of video signals input to the plurality of input ports and the color format conversion unit connected to the non-selection resolution conversion unit stop each operation. Video processing device. The video processing apparatus according to claim 1,
A video processing apparatus comprising: a video synthesis unit that generates a single video by synthesizing a plurality of videos corresponding to the video signals obtained by the plurality of color format conversion units. The video processing apparatus according to claim 1,
A video processing apparatus, wherein the video signals obtained by the plurality of color format conversion units are output to different devices. The video processing apparatus according to claim 1,
Controls data transfer from each of the plurality of color format converters to a memory shared and used by the plurality of color format converters, and stores a storage area in the memory of data transferred from each color format converter An image processing apparatus comprising a memory control unit for controlling. The video processing apparatus according to claim 1,
The video processing apparatus, wherein the color format conversion unit converts a YCbCr signal into an RGB signal. The video processing apparatus according to claim 1,
The plurality of resolution conversion units sequentially capture video signals input from the plurality of input ports in a time-sharing manner,
The plurality of color format conversion units perform processing in parallel.

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