Image forming apparatus for distinguishing between types of colo

Details Image forming apparatus for distinguishing between types of colo Image forming apparatus for distinguishing between types of colo

1996-03-05

2000-09-12

Vu, Kim Yen

Image analysis

Color image processing

Pattern recognition or classification using color

382171, 382176, 358522, 358529, H04N 154

Patent

active

061188956

ABSTRACT:
In a digital full color copying machine, image signals of red, green and blue are converted to a value signal, and histograms of the value signal for chromatic dots and achromatic dots respectively are generated. Then, a document type, such as a color standard document, a color photograph document, a color standard document having a colored background, a black-and-white standard document, or a black-and-white photograph document, is determined automatically based on the histograms. Background level of a copy is controlled automatically at an appropriate level both for a color document and for a black-and-white document having a white background according to the document type by gradation correction of the value signal. Thus, background processing is performed irrespective of a color document or a black-and-white document.

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