Low bit-rate video coding technique

Details Low bit-rate video coding technique Low bit-rate video coding technique

1991-08-30

1993-05-25

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358136, H04N 713

Patent

active

052145069

ABSTRACT:
In a low bit-rate video coder which processes the pels in each video frame on a block-by-block basis using a hybrid differential pulse code modulation and discrete cosine transformation as defined in CCITT Recommendation H.261, the blocks are processed in a sequential order, which in areas of high activity may cause the output buffer to approach its capacity level. In response, the adjoining blocks are more coarsely quantized with resultant image degradation. Improved coding performance is achieved by processing the blocks in a pseudo-random order which disperses the high activity blocks among the more quiescent blocks. As a result the buffer is less likely to reach its maximum capacity, and the quantization levels will remain essentially constant throughout coding of the frame, thereby improving image quality.

REFERENCES:
patent: 5136371 (1992-08-01), Savatier et al.
"Buffering of Data Generated by the Coding of Moving Images", J. O. Limb, AT&T--The Bell System Technical Journal, vol. 51, No. 1, Jan. 1972, pp. 239-259.
"Revised Recommendation H.261--Video Code for Audiovisual Services at p.times.64 kbits/s", DOC.COM XV-R-17E, Jan. 1990, pp. 55-80.
"Video Codec for Audiovisual Services at p.times.64 kbits/s", International Telegraph and Telephone Consultative Committee (CCITT) COM XV-37-E, Aug., 1990.
"Advances in Picture Coding", H. G. Musmann, et al., Proceedings of the IEEE, vol. 73, No. 4, Apr. 1985, pp. 523-548.
"Description of Ref. Model 8 (RMB)", Working Party Specialists Group on coding for Visual Telephony, Jun. 9, 1989, CCITT SGXV.

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