Method and apparatus of copying of black text on documents using

Details Method and apparatus of copying of black text on documents using Method and apparatus of copying of black text on documents using

1992-12-28

1995-12-19

Wong, Peter S.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358461, 358529, 358532, 382167, H04N 140, H04N 146, G03F 308, G06K 940

Patent

active

054773350

ABSTRACT:
A document reproduction method and apparatus wherein a scanner scans a document to determine the color components of pixels forming the image information on the document. The color signals generated by the scanner are transformed into lightness space and each pixel is examined as part of a window that includes neighboring pixels. The examination involves a first determination of whether or not the neighboring pixels are white pixels, second and third determinations of whether or not the current pixel is a grey pixel and has high contrast, and a fourth determination of whether or not the window has text structure. In accordance with combination of these determinations, a decision is made to recast the pixel as a pixel to be reproduced with a black colorant to thereby minimize color fringing errors at the edge of text-like information.

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