Halftone detection and delineation

Details Halftone detection and delineation Halftone detection and delineation

1982-03-19

1983-09-06

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, H04N 140

Patent

active

044032579

ABSTRACT:
In a reprographic system, a method for distinguishing halftone areas from text in an original. The system raster input scanner produces lines of binary data. A predetermined set of bits within a moveable window is inspected and the probability of that particular set of bits being taken from a halftone area of the original is assigned. The window is moved, bit by bit, and line by line, while an accumulation of probability scores is accomplished. Then, the determination, halftone or text, is made for each 32 by 32 bit block, based on a comparison of the accumulation to a predetermined threshold number. Finally, the block decisions themselves are inspected for halftone areas that may have been classified as text because of very high or low density. If surrounding blocks were determined to be halftone, the internal block will be corrected to halftone also.

REFERENCES:
patent: 4194221 (1980-03-01), Stoffel
Tomory--Halftone Detection Using Transition Counting Xerox Disclosure Journal--vol. 5, #6, Nov./Dec. 1980, p. 643.

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