Method and device for recognizing half-tone image information

Details Method and device for recognizing half-tone image information Method and device for recognizing half-tone image information

1986-12-23

1988-04-26

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358298, H04N 140

Patent

active

047408430

ABSTRACT:
A method and device for recognizing half-tone image information having a local frequency within predetermined limits such that an information area which may also contain other kinds of image information, is scanned line by line to generate a video signal or series of pixels which is subjected to a recognition process to determine, for each part of the signal, whether the same belongs to half-tone image information, wherein: the grey level maxima in the signal above a predetermined high threshold value are determined; the distance between each two successive grey level maxima is determined and compared with a predetermined fixed distance; and for the part of the signal between two successive maxima a positive decision is made that the information in that part of the signal is half-tone image information if the distance between two successive grey level maxima previously determined to be above a predetermined high threshold value and a predetermined fixed distance lies within predetermined limits. This method is simpler than other known methods, requires less complex calculations and can be at least approximately performed in real time even with fast scanning of the original.

REFERENCES:
patent: 4194221 (1980-03-01), Stoffel
patent: 4630125 (1986-12-01), Roetling
patent: 4633327 (1986-12-01), Roetling

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