Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1985-11-21
1988-04-05
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358298, H04N 140
Patent
active
047362545
ABSTRACT:
A halftone signal having one of two discrete levels is generated for each print position along each print line by comparison between a gray scale value of an original with a threshold value stored in a memory. The memory has an .alpha.M.times..beta.N matrix array of cells each storing a particular threshold value, where M, N, .alpha. and .beta. are integers. The memory is divided into .alpha..times..beta. identical imaginary matrices of M.times.N elemental areas each containing a cell in a particular one of .alpha..times..beta. positions. The threshold values stored in each imaginary matrix have a prescribed ordered-dither distribution and those stored in positionally corresponding elemental areas have a dot-dispersive or a dot-concentrative distribution. The memory is addressed in a given direction in response to each print position and in a direction normal to the given direction in response to each print line to read a stored threshold value for each print position for comparison with the gray scale value.
REFERENCES:
patent: 4032978 (1977-06-01), Wong
patent: 4517605 (1985-05-01), Yokomizo
patent: 4553173 (1985-11-01), Kawamura
Kotera Hiroaki
Naka Motohiko
Groody James J.
Matsushita Electric - Industrial Co., Ltd.
Svihla Randall S.
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