Compression coding device and expansion decoding device for pict

Details Compression coding device and expansion decoding device for pict Compression coding device and expansion decoding device for pict

1989-12-01

1993-02-02

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

358432, 3582613, H04N 141

Patent

active

051842297

ABSTRACT:
A device for coding a picture signal by compression produces, when detected that the amplitude of data which has undergone two-dimensional orthogonal transform and then normalized has overflown, data specifying the normalized data in addition to coded data of the normalized data. A decoding device, therefore, is capable of accurately decoding original picture data despite the overflow. When a block of picture data lies in a predetermined range which occurs with relatively low probability, the picture data is transformed into coded data which includes a predetermined code. When the block of picture data does not lie in such a range, the picture data is converted into Huffman-coded data. This reduces the required capacity of a look-up table for coding.

REFERENCES:
patent: 4071855 (1978-01-01), Wilmer
patent: 4780761 (1988-10-01), Daly et al.
patent: 4982282 (1991-01-01), Saito et al.

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