Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1988-06-28
1991-03-12
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341126, 358455, 358462, 382 52, H03M 112, H04N 140
Patent
active
049996290
ABSTRACT:
An image signal binarization system for documents containing a mixture of two level and multiple level tone areas, such as characters and photographs, would provide an improved output if the system could distinguish between the two areas and respond accordingly. The proposed system distinguishes between the two types of areas by examining the density of a target point in relation to the average density of the surrounding points. If the density of the target point falls within a predetermined range the area is determined to be a multi-tone section otherwise the area is determined to be a two-tone section. The binarization system upon determining a given section to be a two tone section forces the output to one or zero. For a multi-tone section the output is based upon the mean density.
REFERENCES:
patent: 4251837 (1981-02-01), Janeway, III
patent: 4729035 (1988-03-01), Tanioka
patent: 4831658 (1989-05-01), Umeda
patent: 4853792 (1989-08-01), Katsuta et al.
patent: 4893188 (1990-01-01), Murikami et al.
patent: 4903316 (1990-02-01), Hongo et al.
Sharp Kabushiki Kaisha
Shoop Jr. William M.
Williams H. L.
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