Reproduction apparatus with selective screening and continuous-t

Details Reproduction apparatus with selective screening and continuous-t Reproduction apparatus with selective screening and continuous-t

1990-06-01

1992-06-09

Boudreau, Leo H.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358464, 382 9, 382 51, H04N 100

Patent

active

051212242

ABSTRACT:
Automatic identification of continuous-tone segments of an original document so that such segments can be screened is accomplished by converting the original image into a series of electrical signals characteristic of the optical density gray level of image pixels, calculating the gray level histogram for pixels within defined regions of the original image, and providing signals related to the position of the continuous-tone segment on the basis of the gray level histograms for each region of the original image.

REFERENCES:
patent: 4194221 (1980-03-01), Stoffel
patent: 4411015 (1983-10-01), Scherl et al.
patent: 4556916 (1985-12-01), Matsunawa
patent: 4578712 (1986-03-01), Matsunawa
patent: 4654720 (1987-03-01), Tozawa
patent: 4656665 (1987-04-01), Pennebaker
patent: 4710822 (1987-12-01), Matsunawa
patent: 4740818 (1988-04-01), Tsilibes et al.
patent: 4856075 (1989-08-01), Smith

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