Television – Bandwidth reduction system – Data rate reduction
Patent
1996-03-19
1997-12-16
Au, Amelia
Television
Bandwidth reduction system
Data rate reduction
382237, 382299, H04N 712
Patent
active
056991223
ABSTRACT:
A video signal is encoded to provide a coded video signal, wherein a frame of the video signal is divided into a multiplicity of nonoverlapping blocks and each of the blocks contains K.times.L pixels, K and L being positive integers, by the steps of: dividing K.times.L pixels included in a block into a bright group and a dark group based on intensity values of the pixels; deciding a bit plane which contains K.times.L binary pixels, each of the binary pixels denoting either the bright or the dark group where a corresponding pixel in the block belongs to; dividing the bit plane to N subblocks each of which contains M binary pixels; deciding N majority values each of which represents a more frequently occurring binary pixel value for each of the N subblocks, and for providing a modified bit plane which contains the N majority values as its N binary pixel values; providing a restored bit plane which consists of N subblocks each of which contains M binary pixels having a value corresponds to one of the N majority values; determining a sample mean and a sample variance of the block; determining two reconstruction values which denote a representative intensity value of the pixels included in the bright or the dark group; and combining the two reconstruction values, and the modified bit plane, to thereby provide a block of the coded video signal.
REFERENCES:
patent: 4742553 (1988-05-01), Irwin
patent: 5029228 (1991-07-01), Nonoyama et al.
patent: 5416606 (1995-05-01), Katayama et al.
Au Amelia
Daewoo Electronics Co. Ltd.
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