Image analysis – Histogram processing – For setting a threshold
Patent
1983-01-28
1985-12-17
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
235470, 250566, 382 17, 382 61, G06K 918
Patent
active
045596441
ABSTRACT:
An apparatus and method for reading, processing, storing and later printing out stored data from an original document in which undesired data portions are prevented from being recorded. Portions of the printed original image which are desirably retained and recorded are printed with solid lines, while image portions, for instance, ledger lines, which are desirably not retained and recorded, are printed as optically fine discontinuous patterns. The original thus printed is scanned line by line. The analog signal which is produced by the scanning device has high frequency portions when an optically fine discontinuous pattern is scanned. These portions are eliminated by low-pass filtering or by determining the degree of correlation between the sensor output signal and stored data representing the optically fine discontinuous patterns.
REFERENCES:
patent: 2231494 (1941-02-01), Dickinson
patent: 2947972 (1960-08-01), Steinbuch
patent: 3201752 (1965-08-01), Rabinow
patent: 3467829 (1969-09-01), Wilmotte
patent: 3810094 (1974-05-01), Mori et al.
patent: 4377803 (1983-03-01), Lotspiech et al.
Arai Yoshio
Kataoka Hiroyuki
Boudreau Leo H.
Fuji 'Xerox Co., Ltd.
Mancuso Joseph
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