Television – Bandwidth reduction system – Data rate reduction
Patent
1997-01-17
1999-05-25
Tung, Bryan
Television
Bandwidth reduction system
Data rate reduction
348408, 348419, H04N 712
Patent
active
059073624
ABSTRACT:
Picture data into small-area blocks, which are then shuffled. The shuffled picture data is then subjected to orthogonal transform. A total-frequency-range activity of transform coefficients is calculated on a block-by-block basis and accumulated over a slice. A high-frequency-range activity of the transform coefficients is calculated on a block-and-block basis and accumulated over the slice. Selection is made between a block quantization step which is calculated from the total-frequency-range activity of a block and a slice quantization step which is calculated adaptively from the total-frequency-range activity accumulation value of the slice. A quantization step to be used in actual quantization is determined by using the sum of the selected quantization step and a difference quantization step.
REFERENCES:
patent: 5325125 (1994-06-01), Naimpally et al.
patent: 5329375 (1994-07-01), Juri et al.
patent: 5337087 (1994-08-01), Mishima
patent: 5355167 (1994-10-01), Juri
patent: 5489944 (1996-02-01), Jo
patent: 5598213 (1997-01-01), Chung et al.
patent: 5636316 (1997-06-01), Oku et al.
patent: 5664028 (1997-09-01), Blonstein et al.
M. Enari et al., "HDTV codec' for 60-140 Mbps", Video Information, (Jan. 1992), pp. 51-58.
NEC Corporation
Philippe Gims S.
Tung Bryan
LandOfFree
Picture coding apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Picture coding apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Picture coding apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-404043