JP3016291B2 - Multimedia frame buffer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multimedia frame buffer for displaying moving image data and graphic data in a mixed manner.

[0002]

2. Description of the Related Art As means for expanding the information processing ability of a computer, multimedia processing for processing data such as figures, moving images, and voices in addition to conventional data such as numerical values / characters has attracted attention. Moving image data characterizing multimedia processing has several color space formats. In the conventional moving image data processing method, as shown in FIG. To convert the data into an RGB format widely used in information processing apparatuses. Therefore, the video data bus 203 is used and the frame buffer
The moving image data transferred to the unit 204 is in the RGB format.

A conventional frame buffer unit 2
04 is a graphic data bus 205 and a video data bus.
Display data is received from the data bus 203. The frame buffer access control unit 206 controls the transfer order of data from the two buses and stores the data in the frame buffer 208. Raster operation processor 20
Reference numeral 7 processes data on the frame buffer 208 to speed up window movement and the like. Window type
The table 209 outputs display format information from the data stored in the frame buffer 208, and the look-up table address generator 210
Controls the generation of the address used when accessing 1. The output of the look-up table 211 is converted by the digital / analog converter 212 into a signal that can be displayed by the CRT 213.

[0004]

In the conventional system, since the color space is converted on the moving image data output side of the video data bus, the moving image data transferred on the video data bus are all in RGB format. . The moving image data requires 21 megabytes of data per second according to CCIR601 which is an image quality standard of television broadcasting. For this reason, there is a problem that the load on the video data bus increases when applications such as displaying a plurality of moving image screens are considered.

SUMMARY OF THE INVENTION It is an object of the present invention to enable a frame buffer unit to process data in a color space format capable of processing moving image data of substantially the same image quality with a smaller data amount than that of an RGB format such as YUV. An object of the present invention is to provide a multimedia frame buffer which enables data in a color space format other than RGB to be transferred on a data bus and reduces the load on a video data bus.

[0006]

According to a first aspect of the present invention, there is provided a multimedia frame buffer comprising: a video data bus which is a transfer path of moving image data sent from a moving image data input device such as a video camera; A graphic data bus to which display screen information of the device is sent, a frame buffer access control unit for controlling a transfer order of data sent from the two data buses, and a frame buffer for storing the data A window type table for outputting display format information from data stored in the frame buffer; and a color space converter for converting color information data stored in the frame buffer in a color space format other than RGB into RGB format. The RGB color information data stored in the frame buffer is converted into the color space data. A color information timing adjuster for preventing the color information data from being used, and a color space converter for storing a color space code from the color space code stored in the frame buffer together with the color information data and indicating the color space format of the color information data. A color space table that outputs a control signal and a signal indicating the presence or absence of color space conversion, and the color space converter and the color information timing adjuster that are output by the color space table and that indicate the presence or absence of color space conversion. A color information data selector for selecting an output of the display information; a lookup table address generator for generating an address for reading display information from the output of the color information data selector and the window type table; The pixel digit to display from the address output by the up table address generator A look-up table for outputting a digital signal, a digital / analog converter for converting a digital signal output from the look-up table into an analog signal, and a CRT for receiving and displaying the signal of the digital / analog converter. The moving image data transmitted from the video data bus
When a color space code indicating that a color space format other than RGB is used and video data in a color space format other than RGB is input, the color space converter
By converting a color space into a format, moving image data other than RGB is displayed.

A multimedia frame buffer according to a second aspect of the present invention includes a video data bus, which is a transfer path of moving image data sent from a moving image data input device such as a video camera, and display screen information of an information processing device. The graphic data bus that is sent and the two data
A frame buffer access control unit for controlling a transfer order of data sent from the bus, a frame buffer for storing the data, a window type table for outputting display format information from the data stored in the frame buffer; , A color space converter for converting color information data stored in the frame buffer in a color space format other than RGB into RGB format, and the color information converter in RGB format stored in the frame buffer uses the color space converter. A color information timing adjuster for preventing the color information data from overtaking; and a color space flag stored in the frame buffer together with the color information data and indicating a color space format of the color information data, using the color space converter. Tag for color space flag to prevent overtaking information data A timing adjuster, and the color information data selector for selecting the output of the color space flag timing adjuster the color space transformer by the value of the color space flag outputted from the timing adjuster for the color information,
A look-up table address generator for generating an address for reading display information from the output of the color information data selector and the window type table; and an address output from the lookup table address generator. A look-up table for outputting a digital signal of a pixel to be displayed, a digital / analog converter for converting a digital signal output from the look-up table into an analog signal, and receiving and displaying a signal from the digital / analog converter. The video data transmitted from the video data bus includes RG
When a color space flag indicating that a color space format other than B is used is added and moving image data in a format other than RGB is input, the color space is converted into RGB format by the color space converter. It is characterized by displaying moving image data other than the format.

[0008]

According to the first aspect of the present invention, a multimedia frame buffer is provided with a color space converter for converting a color space from output data of a frame buffer of a conventional frame buffer unit, and a color space converter. Timing adjuster for color information data that corrects timing disturbances due to the presence or absence of color space conversion of video data,
A color space table that outputs a control signal in a conversion format when the color space converter performs color space conversion is a feature of the configuration. RGB and a color space format other than RGB can be used as input data to be processed, and the color space format is determined by a color space code added to the input data.

By using the color space code of the input data, the multimedia frame buffer of the present invention displays the RGB format data as it is without converting the color space format, and displays the data in a color space format other than RGB. In this case, by using a color space converter and converting the data into the RGB format and displaying the converted data, it is possible to display data in the RGB and non-RGB formats.

A multimedia frame buffer according to a second aspect of the present invention includes a color space converter for converting a color space from output data of a frame buffer of a conventional frame buffer unit, and a color space converter. Two timing adjusters that correct the timing disturbance due to the above are characterized in configuration. RGB and a color space format other than RGB can be used as input data to be processed, and the color space format is determined by a color space flag added to the input data.

By using the color space flag of the input data, the multimedia frame buffer of the present invention displays the RGB format data as it is without converting the color space format, and displays the data in the color space format other than RGB. In such a case, by using a color space converter and converting the data to the RGB format and displaying the data, it is possible to display data in a format other than the RGB format.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a multimedia frame buffer according to the first invention. The multimedia frame buffer includes a video data bus 102, which is a transfer path of moving image data sent from a moving image data input device such as a video camera, and a graphic data bus to which display screen information of an information processing device is sent. A data bus 101 and a frame buffer for controlling the transfer order of data sent from these two data buses;
An access control unit 103, a frame buffer 105 for storing data, a raster operation processor 104 for providing a raster operation function, and a window type table 109 for outputting display format information from the data stored in the frame buffer 105; , A color space converter 107 for converting color information data stored in a frame buffer 105 in a color space format other than RGB into an RGB format, and a color space converter 107 for color information data in an RGB format stored in a frame buffer. A color information timing adjuster 106 for preventing the color information data from overtaking, and a control signal for the color space converter 107 based on a color space code stored in the frame buffer 105 together with the color information data and indicating the color space format of the color information data. And color space transformation A color space table 108 that outputs a signal indicating the presence or absence of color space conversion, and an output of the color space converter 107 and the color information timing adjuster 106 are selected based on the value of the signal output from the color space table that indicates the presence or absence of color space conversion. Color information data selector 110, color information data selector and window type table 109
And a look-up table address generator 111 for generating an address for reading display information from the output of the display table, and a look-up table for outputting a digital signal of a pixel to be displayed from the address output from the look-up table address generator. A table 112, a digital / analog converter 113 for converting a digital signal output from the look-up table into an analog signal, and a CRT 114 for receiving and displaying the signal of the digital / analog converter
It is composed of

Next, the operation of this embodiment will be described. Graphic data is sent from the graphic data bus 101. The moving image data is sent from the video data bus 102. The data transmitted from the two buses is stored in the frame buffer 105 by the frame buffer access control unit 103 controlling the data transfer order. The raster operation processor 104 provides a raster operation function to speed up the movement of windows and the like.

In the case of moving picture data in RGB format, moving picture data read from the frame buffer 105 passes through the timing adjuster 106 and reaches the color information data selector 110. At the same time, the color space code is sent from the frame buffer 105 to the color space table 108. The color space table 108 outputs a signal indicating the presence or absence of color space conversion for controlling the color information data selector 110. In this case, since the color space code indicates the RGB format, the color information data selector 110 selects the output of the color information timing adjuster 106 and sends it to the lookup table address generator 111. . In parallel with this processing, the window type information read from the frame buffer 105 accesses the window type table 109, and outputs the table base address at the time of generating the address of the lookup table. Look-up table address generator 111
Is the base address of the table output by the window type table 109 and the color information data selector 110
Lookup table 1 from color information data output by
Then, an address for accessing No. 12 is generated. The output of the look-up table 112 is converted to an analog signal by a digital / analog converter
4 is displayed.

Moving image data other than the RGB format, for example, Y
In the case of UV format data, the moving image data read from the frame buffer 105 is sent to the color space converter 107. At the same time, the color space code read from the frame buffer 105 is stored in the color space table 108.
To determine the format of the color space conversion performed by the color space converter 107. In this case, color space table 1
08 instructs the color space converter 107 to convert the color space from YUV to RGB. Furthermore, color space table 1
08 controls the color information data selector 110 and sends the output of the color space converter 107 to the lookup table address generator 111. Thereafter, the moving image is displayed on the CRT 114 through the look-up / table 112 and the digital / analog converter 113 in the same manner as the data in the RGB format.

FIG. 2 is a block diagram of an embodiment of a multimedia frame buffer according to the second invention. The multimedia frame buffer includes a video data bus 101, which is a transfer path of moving image data sent from a moving image data input device such as a video camera, and a graphic data bus to which display screen information of an information processing device is sent. A data bus 102 and a frame buffer for controlling the transfer order of data sent from these two data buses;
An access control unit 103, a frame buffer 105 for storing data, a raster operation processor 104 for providing a raster operation function, and a window type table 109 for outputting display format information from the data stored in the frame buffer 105; A color space converter 107 for converting color information data stored in a frame buffer 105 in a color space format other than RGB into an RGB format, and a color space converter 107 for color information data in an RGB format stored in the frame buffer 105 The color information timing adjuster 106 for preventing the color information data to be overtaken, and the color space flag 107 stored in the frame buffer 105 together with the color information data and indicating the color space format of the color information data use the color space converter 107. Color information day The output of the color space converter 107 and the color information timing adjuster 106 is controlled by the color space flag timing adjuster 115 for preventing the color space flag from being overtaken, and the value of the color space flag output from the color space flag timing adjuster. A color information data selector 110 to be selected; a lookup table address generator 111 for generating an address for reading display information from the output of the color information data selector and the window type table 109; Look-up table 112 for outputting a digital signal of a pixel to be displayed from an address output from the table address generator
And a digital / analog converter 113 for converting a digital signal output from the look-up table into an analog signal, and a CRT 114 for receiving and displaying the signal of the digital / analog converter.

Next, the operation of this embodiment will be described. The graphic data is stored in the graphic data bus 101
Sent from. The moving image data is sent from the video data bus 102. The data sent from the two buses is transmitted to the frame buffer access control unit 103
Controls the data transfer order, and the frame buffer 105
To be stored. The raster operation processor 104 provides a raster operation function to speed up the movement of windows and the like.

In the case of moving picture data in the RGB format, moving picture data read from the frame buffer 105 passes through the color information timing adjuster 106 and reaches the color information data selector 110. At the same time, the color space flag is read from the frame buffer 105, passes through the color space flag timing adjuster 115, and passes through the color information data selector 11
0 is controlled. In this case, if the color space flag is RGB
Color information data selector 1
10 selects the output of the color information timing adjuster 106 and sends it to the look-up table address generator 111. In parallel with this processing, the window type information read from the frame buffer 105
Access type table 109 and look up
Outputs the table base address when generating the table address. Lookup table address generator 111 is an address for accessing lookup table 112 from the base address of the table output from window type table 109 and the color information data output from color information data selector 110. Generate
The output of look-up table 112 is converted to an analog signal by digital / analog converter 113,
Displayed on RT114.

Moving image data other than the RGB format, for example, Y
In the case of data in the UV format, the moving image data read from the frame buffer 105 is subjected to format conversion by a color space converter 107 that performs YUV to RGB format conversion,
The data is sent to the color information data selector 110. At the same time, the color space flag read from the frame buffer 105 passes through the color space flag timing adjuster 115, controls the color information data selector 110, and outputs the output of the color space converter 107 to the look-up table address. Send to generator 111. Thereafter, the look-up table 112 and the digital data are stored in the same manner as the data in the RGB format.
The moving image is displayed on the CRT 114 through the analog converter 113.

[0021]

According to the first aspect of the present invention, there is provided a multimedia frame buffer comprising: a color space converter for converting a color space; and a timing for color information data for correcting timing disturbance due to the addition of the color space converter. The configuration is characterized by an adjuster and a color space table that outputs a signal for controlling the presence or absence of color space conversion of moving image data and a conversion format when the color space converter performs color space conversion. By adding a color space code to moving image data, it is possible to display moving image data in RGB format and other color space formats. As a result, YU
V and other video data of a format that can process video data of similar image quality with a smaller data amount than the RGB format.
The data bus allows the transfer.

A multimedia frame buffer according to a second aspect of the present invention provides an RGB format and a RGB frame format by adding a color space flag to moving image data and a structural feature of a color space converter and two timing adjusters. It is possible to display video data in a data format other than. As a result, it is possible to transfer, via the video data bus, data in a format such as YUV, which can process moving image data of similar image quality with a smaller data amount than in the RGB format.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a multimedia frame buffer according to the first invention.

FIG. 2 is a block diagram showing an embodiment of a multimedia frame buffer according to the second invention;

FIG. 3 is a block diagram of a conventional frame buffer unit.

[Explanation of symbols]

 Reference Signs List 101 Graphic data bus 102 Video data bus 103 Frame buffer access control unit 104 Raster operation processor 105 Frame buffer 106 Timing adjuster 107 Color space converter 108 Color space table 109 Window type table 110 Color information data Selector 111 Lookup table address generator 112 Lookup table 113 Digital / analog converter 114 CRT 115 Color space flag timing adjuster 201 Video camera 202 Color space converter 203 Video data bus 204 Frame buffer Unit 205 Graphic data bus 206 Frame buffer access control unit 207 Raster operation Processor 208 Frame buffer 209 Window type table 210 Lookup table address generator 211 Lookup table 212 Digital / analog converter 213 CRT

Claims (2)

(57) [Claims] 1. A video data bus, which is a transfer path for moving image data sent from a moving image data input device such as a video camera, and a graphic data bus, to which display screen information of an information processing device is sent. A frame buffer access control unit for controlling a transfer order of data sent from the two data buses, a frame buffer for storing the data, and outputting display format information from the data stored in the frame buffer. A window type table, a color space converter for converting color information data stored in the frame buffer in a color space format other than RGB into RGB format, and color information data in RGB format stored in the frame buffer being the color A color information tie that does not overtake color information data that uses a spatial converter And a color adjustment data stored in the frame buffer together with the color information data.
A color space table that outputs a control signal of a color space converter and a signal indicating whether or not color space conversion is performed from a color space code indicating a color space format of the color information data; and a color space table that is output by the color space table. A color information data selector for selecting an output of the color space converter and the color information timing adjuster according to a value of a signal to be indicated; and reading out display information from the output of the color information data selector and the window type table. Look-up table address generator for generating an address for the same, a look-up table for outputting a digital signal of a pixel to be displayed from the address output from the look-up table address generator, and the look-up table To convert the digital signal output by the An analog converter, and C for receiving and displaying the signal of the digital / analog converter.
RT, and adds a color space code indicating that a color space format other than RGB is used to the moving image data sent from the video data bus, and converts the moving image data in a color space format other than RGB. Upon input, the color space converter converts the color space into RGB format,
A frame buffer for multimedia, which displays moving image data other than GB. 2. A video data bus which is a transfer path for moving image data sent from a moving image data input device such as a video camera, and a graphic data bus to which display screen information of an information processing device is sent. A frame buffer access control unit for controlling a transfer order of data sent from the two data buses; a frame buffer for storing the data; and display format information from the data stored in the frame buffer. A window type table, a color space converter for converting color information data stored in the frame buffer in a color space format other than RGB into RGB format, and color information data in RGB format stored in the frame buffer being the color A color information tag that does not overtake color information data that uses a spatial A timing adjuster, is stored with the color information data in the frame buffer,
A color space flag indicating the color space format of the color information data is output from the color space flag timing adjuster for preventing the color information data using the color space converter from overtaking the color information flag. A color information data selector for selecting the output of the color space converter and the color information timing adjuster according to the value of the color space flag, and display information from the output of the color information data selector and the window type table. A look-up table address generator for generating an address for reading out, a look-up table for outputting a digital signal of a pixel to be displayed from the address output by the look-up table address generator, and the look-up・ Digital signal output from table is converted to analog signal A digital / analog converter for converting, and a C for receiving and displaying the signal of the digital / analog converter
When a color space flag indicating that a color space format other than RGB is used is added to the moving image data sent from the video data bus, and moving image data of a format other than RGB is input, RG by the above color space converter
A frame buffer for multimedia, wherein moving image data other than RGB format is displayed by performing color space conversion to B format.