Method and apparatus for picture encoding and decoding

Details Method and apparatus for picture encoding and decoding Method and apparatus for picture encoding and decoding

1996-05-31

1999-03-02

Couso, Jose L.

Image analysis

Image compression or coding

382238, 382248, 382250, 348421, 348422, G06K 936

Patent

active

058781684

ABSTRACT:
A picture encoding apparatus for encoding an input digital picture signal in such a manner that the amount of generated data is reduced is disclosed, that comprises a dividing unit for dividing the input digital picture signal into blocks each of which is composed of a plurality of pixels, a detecting unit for detecting the maximum value of the pixels of each block, the minimum value thereof, and a dynamic range that is the difference between the maximum value and the minimum value, a quantizing unit for quantizing each value of the pixels that has been normalized with the value of the dynamic range, and an additional code encoding unit for generating the difference of the minimum value with the minimum value and a delayed value of the minimum value and for variable-length code encoding the difference of the minimum value.

REFERENCES:
patent: 4903124 (1990-02-01), Hoshi et al.
patent: 5038389 (1991-08-01), Mizuno
patent: 5070402 (1991-12-01), Ishii et al.
patent: 5166987 (1992-11-01), Kageyama
patent: 5253122 (1993-10-01), Chiba et al.

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