Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1986-06-05
1987-05-19
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358298, H04N 140
Patent
active
046672508
ABSTRACT:
Processing used to represent a gradation by changing the number of black pixels and the number of white pixels in a matrix of 8.times.8 pixels. First, edge information sampled from the input data is allocated to corresponding pixel positions of the output data with priority. A residual gradation value is determined by subtracting a value corresponding to the edge information already allocated from the average gradation of the input data, and black pixels and white pixels are alternately allocated to the remaining pixel positions of the output data except for the edge region, in accordance with the ratio of the number of those remaining pixels to the residual gradation value. When the region except for the edge region is divided into a plurality of regions, an average gradation for each of the divided regions is determined and a residual gradation value is distributed to each of the divided regions in accordance with the ratio between the average gradations, followed by allocating black pixels and white pixels to each of the divided regions in accordance with the ration of the distributed residual gradation value to the number of pixels in that region.
REFERENCES:
patent: 4246614 (1981-01-01), Knox
patent: 4288821 (1981-09-01), Lavallee et al.
patent: 4551768 (1985-11-01), Tsuchiya et al.
patent: 4554594 (1985-11-01), Ciardiecco
patent: 4556916 (1985-12-01), Matsunawa
Coles Sr. Edward L.
Ricoh & Company, Ltd.
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