Facsimile and static presentation processing – Facsimile – Reduced time or bandwidth for static image communication
Patent
1990-05-17
1992-03-31
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Reduced time or bandwidth for static image communication
358432, 358433, H04N 141, H04N 1415
Patent
active
051012804
ABSTRACT:
A picture signal compression coding device is disclosed which divides digital picture data constituting a single picture into a plurality of blocks and codes the picture data block by block by two-dimensional orthogonal transformation. An orthogonal transforming section transforms the digital picture data divided into the plurality of blocks by two-dimensional orthogonal transformation. A normalizing section normalizes the transformed data, while a coding section codes the normalized data. A block activity calculating section calculates an activity of the picture data block by block. An activity summing section sums the block-by-block activities to produce a total activity. A coded data distributing section calculates an amount of coded data to be distributed to each of the blocks on the basis of the ratio of the block-by-block activity to the total activity. A coded output control section limits the amount of coded data to be distributed to each of the blocks from the coding section in response to an output of the coded data distributing section. The block activity calculating section has a subdividing section for subdividing each of the blocks of picture data into a plurality of subblocks, a subblock activity calculating section for calculating the activity of the picture data subblock by subblock, and a difference calculating section for determining a difference between nearby ones of the subblocks with respect to the mean value of subblock-by-subblock picture data.
REFERENCES:
patent: 4677479 (1987-06-01), Hatori et al.
patent: 4774574 (1988-09-01), Daly et al.
patent: 4982282 (1991-01-01), Saito et al.
Ito Kenji
Moronaga Kenji
Watanabe Mikio
Coles Sr. Edward L.
Fuji Photo Film Co. , Ltd.
Lee Thomas D.
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