System for compression and decompression of video data using dis

Details System for compression and decompression of video data using dis System for compression and decompression of video data using dis

1990-03-14

1993-03-23

Boudreau, Leo H.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358427, 382 56, H04N 1415

Patent

active

051969467

ABSTRACT:
A digital video compression system and an apparatus implementing this system are disclosed. Specifically, matrices of pixels in the RGB signal format are converted into YUV representation, including a step of selectively sampling the chrominance components. The signals are then subjected to a discrete cosine transform (DCT). A circuitry implementing the DCT in a pipelined architecture is provided. A quantization step eliminates DCT coefficients having amplitude below a set of preset thresholds. The video signal is further compressed by coding the elements of the quantized matrices in a zig-zag manner. This representation is further compressed by Huffman codes. Decompression of the signal is substantially the reverse of compression steps. The inverse discrete cosine transform (IDCT) may be implemented by the DCT circuit. Circuits for implementing RGB to YUV conversion, DCT, quantization, coding and their decompression counterparts are disclosed. The circuits may be implemeneted in the form an integrated circuit chip.

REFERENCES:
patent: 4704628 (1987-11-01), Chen et al.
patent: 4847677 (1989-07-01), Music et al.
patent: 4858026 (1989-08-01), Richards
patent: 4910609 (1990-03-01), Nicholas et al.

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