Color adjustment table system for YUV to RGB color conversion

Details Color adjustment table system for YUV to RGB color conversion Color adjustment table system for YUV to RGB color conversion

1996-05-22

2001-01-09

Rao, Andy (Department: 2713)

Television

Basic receiver with additional function

Instant replay or freeze frame

C348S559000, C348S661000, C348S660000

Reexamination Certificate

active

06172714

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to the field of computer systems and, more specifically, to computer graphic subsystems.
BACKGROUND OF THE INVENTION
In all digital playback systems, a key component is the conversion of pixels represented in the YUV, or luminance-chrominance color space to a value in the RGB, or Red-Green-Blue color space. The YUV pixels are those that are typically provided via an external video device such as a video camera, video tape player, etc. Digital Video is often stored with some form of data compression; video decompression processors will most often output data in YuV format. The pixels represented in the RGB format are used to display images on a display device, such as a computer monitor, etc.
Efficiency is critical for the translation operation because it must be executed for each input video pixel; speed enhancements at this stage of operation can therefore provide a dramatic improvement on the performance of the overall video system.
One problem with providing efficient translation arises when considering the additional step of color adjustment. Raw pixel data may require color adjustment for display on the output device, since the raw input data and output display device may not always be compatible. It is a main objective to provide a pleasing output image; therefore, often the hue, saturation, or brightness of the image must be adjusted at some point prior to display.
However, adjustment causes an additional step that may accordingly reduce performance. One method of color adjustment, described in pending U.S. patent Ser. No. 07/961,558, filed Oct. 15, 1992 entitled “Imaging System with Image Adjustment System”, by Ulichney et al. used a table for storing adjusted pixel values. Raw input pixel values were fed to the table, and the adjusted values were then fed for use to the video logic.
While the above system provided a means for color adjusting raw pixel values, it had some drawbacks. An extra table look-up had to be performed before any work could be done with the pixel value, thereby increasing the remaining time available for pixel operation. In addition, it provided an inflexible approach because it was limited simply to color adjustment based on certain input variables.
SUMMARY OF THE INVENTION
According to one aspect of the invention,a method for providing color adjustment in a color conversion system includes the steps of determining, responsive to a plurality of adjustment variables, a characteristic of adjustment, and defining, for each one of a plurality of values of a plurality of components of a first type pixel a correspondence value defining the correspondence between the each first type pixel and a second type pixel. The method further includes the steps of adjusting the correspondence value of each of the plurality of values by the characteristic of adjustment to provide an adjusted correspondence value for each first type pixel, and storing the adjusted correspondence value for each first type pixel in a memory.
With such an arrangement, color adjustment may be provided in advance and stored on the run-time system to allow for fast color adjustment during processing that adds no performance loss to the overall system. In addition, because the color adjustment may be performed via software, the adjustment criteria may easily be altered by merely updating the table contents.


REFERENCES:
patent: 5233684 (1993-08-01), Ulichney
patent: 5583666 (1996-12-01), Ellson et al.
patent: 5602941 (1997-02-01), Charles et al.
patent: 5691779 (1997-11-01), Yamashita et al.

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