Image analysis – Image compression or coding – Gray level to binary coding
Patent
1997-04-18
1999-07-20
Lee, Thomas D.
Image analysis
Image compression or coding
Gray level to binary coding
382270, 358455, 358464, 358466, G06K 936, G06K 946
Patent
active
059265701
ABSTRACT:
A method and apparatus of preparing the reproduction of a document based on scanning the original including generating a signal representing grey tone values for points along lines across the scanned original and providing a set of threshold values for said points. The set of threshold values being determined so that grey tone values in a uniform area on the original are converted into a uniform black or white representation in a first one-bit representation. The method and apparatus provides parameter values for said points in a dither circuit, and converts the grey tone signal received from the line scanning unit into a signal comprising a second one-bit representation. The conversion into a one-bit representation is performed by depending on the individual grey tone values compared with the present threshold values and the dither circuit output for the points in question.
REFERENCES:
patent: 4975786 (1990-12-01), Katayama et al.
patent: 5452107 (1995-09-01), Koike
patent: 5502578 (1996-03-01), Smitt
Contex A/S
Lee Thomas D.
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