Television – Bandwidth reduction system – Data rate reduction
Patent
1995-08-25
1998-05-05
Tung, Bryan S.
Television
Bandwidth reduction system
Data rate reduction
348417, 348422, H04N 728
Patent
active
057482420
ABSTRACT:
A method and apparatus for low bit rate coding of color video signals in which the use of the codebook entry identified by the codebook index may be bypassed in the coding of chrominance information when it is determined that it is advantageous to do so. In particular and in accordance with an illustrative embodiment of the present invention, the method comprises the steps of generating a codebook index signal based on the luminance information of the block being coded; determining a coding error based on a comparison of the chrominance information contained in the given block and the chrominance vector represented by the generated codebook index signal; and generating a chrominance vector bypass signal based on whether the coding error exceeds a threshold. Specifically, the chrominance vector bypass signal is used to indicate whether the chrominance information of the given block has or has not been coded with use of the codebook. In one illustrative embodiment, the motion-compensated interframe prediction for the given block is used (without any interframe codebook difference vector adjustment) to code the chrominance signal when the chrominance data from the indexed codebook entry is not used (i.e., when it is bypassed).
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patent: 5467413 (1995-11-01), Barrett
C.S. Kim et al, "Subband Coding Of Color Images Using Finite State Vector Quantization," Proc. Int. Conf. on Acous., Speech and Signal Processing, NY, 1988 (April), pp. 753-756.
Y. Feng et al., "A Dynamic Address-Vector Quantization Algorithm Based On Interblock And Intercolor Correlation For Color Image Coding", Proc. Int. Conf. on Acous., Speech and Signal Processing, 1989, pp. 1755-1758. (month not avail.).
Brown Kenneth M.
Lucent Technologies - Inc.
Tung Bryan S.
LandOfFree
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