Television – Bandwidth reduction system – Data rate reduction
Patent
1993-08-31
1995-06-13
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348384, 348390, H04N 730
Patent
active
054247780
ABSTRACT:
Image signals are orthogonal-transformed (DCTed) in mutually different dimensions (DMs) to obtain transform coefficients (TC) for each DM, which are then compared mutually to select TC of one DM based on the comparison. Or else, such TC of one DM are selected based on the image signals in a specific DM and the selected TC are quantized and variable-length coded to output coded signals. In another way, prediction error (PE) signals obtained by predictive coding (PC) are DCTed in mutually different DMs to obtain TC for each DM; the TC of one DM are selected based on the PE signals in a specific DM, and then quantized and coded. Or else, the TC obtained for each DM are quantized and then compared mutually. The quantized signals of one DM are selected based on the comparison and then coded. Or else, the TC obtained for each DM are quantized and coded, and coded signals of one DM are selected based on the comparison. The coded signals are transmitted together with mode information (MI) indicating which DM the selected TC are transformed in. The coded signals are decoded, and then inversely quantized (IQed). The IQed signals are inversely DCTed in the DM indicated by the MI.
REFERENCES:
patent: 4691329 (1987-09-01), Juri et al.
patent: 4999705 (1991-03-01), Puri
patent: 5045938 (1991-09-01), Sugiyama
Patents Abstracts of Japan, vol. 15, No. 394 (E-1119), Oct. 7, 1991 & JPA03159489 (Fujitsu Ltd), Jul. 9, 1991.
Nakamura Hiroya
Sugiyama Kenji
Chin Tommy P.
Lee Richard
Victor Company of Japan Ltd.
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