Image signal processing method and apparatus therefor

Details Image signal processing method and apparatus therefor Image signal processing method and apparatus therefor

1981-10-20

1983-11-08

Britton, Howard

Facsimile and static presentation processing

Facsimile

Recording apparatus

358283, H04N 140

Patent

active

044145810

ABSTRACT:
An image signal processing method and apparatus for practicing the method are capable of identifying and differentiating information not having tonal rendition such as characters and linetone images from information having tonal rendition such as photographs and pictures, based on the difference of signal characteristics, for example based on the fact that the spatial frequency distribution in portions of an image not having tonal rendition are in the higher frequency range compared to that of the portions of the image having tonal rendition. The method and apparatus are also capable of conducting different processes on the identified different images.

REFERENCES:
patent: 4251837 (1981-02-01), Janeway
patent: 4258393 (1981-03-01), Ejiri
patent: 4288821 (1981-09-01), Lavallee
patent: 4349846 (1982-09-01), Sekigawa

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