H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/33, 178/3.1
H04N 7/26 (2006.01)
Patent
CA 1119713
ABSTRACT OF THE DISCLOSURE A frame of a gray-sealed picture is divided into blocks, in each of which the mean luminance of picture elements is used as a threshold value for comparison with each picture element signal to classify it into 0 or 1 according to its magnitude to provide a resolution component. From the resolution component and each picture element signal in the block are calculated two gray components; the resolution component and the two gray components are used as coded outputs for each block. The size of each block is changed in accordance with the property of the picture in the portion corresponding to the block.
316730
Hoshida Katsusuke
Kamae Takahiko
Kishimoto Tomio
Mitsuya Eiji
Kirby Eades Gale Baker
Nippon Telegraph And Telephone Public Corporation
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