Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-03-05
1993-01-05
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358455, 358456, H04N 140
Patent
active
051776235
ABSTRACT:
An image processing apparatus for converting multi-tone image signals to binary image signals in reference to threshold levels arranged in matrix to form a threshold pattern, which apparatus comprises a generator for generating the multi-tone image signals, a first memory storing a plurality of threshold patterns which are different from each other, a selector for selecting one of the threshold patterns, a high-speed memory for storing the threshold patterns selected by the selector from first memory, a writing unit for writing the selected thereshold pattern in the high-speed memory from the first memory, a reading unit for reading out the selected threshold pattern from the high-speed memory, and a converter for converting the multi-tone image signals generated by the generator to the binary image signals in reference to the threshold levels of the selected threshold pattern which are read out from the high-speed memory by the reading unit.
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patent: 4674861 (1987-06-01), Kawamura
patent: 4680625 (1987-07-01), Shoji et al.
patent: 4698691 (1987-10-01), Suzuki et al.
patent: 4941057 (1990-07-01), Lehmbeck et al.
patent: 5075872 (1991-12-01), Kumagai
Coles Sr. Edward L.
Grant II Jerome
Minolta Camera Kabushiki Kaisha
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