Method and apparatus for generating CLUT-format video images

Details Method and apparatus for generating CLUT-format video images Method and apparatus for generating CLUT-format video images

1993-08-16

1995-01-10

Kostak, Victor R.

Television

Bandwidth reduction system

Data rate reduction

345199, H04N 1104

Patent

active

053811801

ABSTRACT:
A method and apparatus for generating a video image by converting full-resolution three-component video data into color-look-up-table (CLUT) index data. The three-component video data are processed to generate N-bit index data for a lookup table that maps to M-bit CLUT index data, where M is less than N. The M-bit CLUT data is then used to generate the video image. In a preferred embodiment used to generate video images from subsampled video data, subsampled video data (e.g., in YUV-9 or YUV-12 format) is first upsampled (e.g., by replication or interpolation) to generate the full-resolution three-component video data. In a different preferred embodiment used to generate dithered video images, the processing of the full-resolution three-component data involves adding noise, truncating the three "noisy" components, and combining the three truncated "noisy" components to generate the N-bit lookup table index data.

REFERENCES:
patent: 4654695 (1987-03-01), Fling
patent: 5258826 (1993-11-01), Wakeland et al.

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