Device for coding a picture signal by compression

Details Device for coding a picture signal by compression Device for coding a picture signal by compression

1989-12-12

1991-09-24

Orsino, Joseph A.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358432, 358426, 382 56, H04N 1415

Patent

active

050518402

ABSTRACT:
A picture signal compression coding device divides picture data into a plurality blocks and subjects the individual blocks of picture data to an orthogonal transform, a normalization, and a coding. The amounts of data to be allocated to the individual blocks are determined on the basis of the ratios of the activities of the individual blocks to a sum of the block-by-block activities, whereby the output of the individual blocks of coded data is restricted. The amount of coded data is allocated in matching relation to the frequency components of the individual blocks, so that more data are distributed to those blocks in which high frequency components are predominant. Further, the number of bits to be assigned to the entire picture is maintained constant.

REFERENCES:
patent: 4722003 (1988-01-01), Kondo
patent: 4868641 (1989-09-01), Modaresse
patent: 4920414 (1990-04-01), Remus et al.
patent: 4933763 (1990-06-01), Chantelou

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