Method and apparatus for estimating halftone image from binary i

Details Method and apparatus for estimating halftone image from binary i Method and apparatus for estimating halftone image from binary i

1986-04-28

1988-07-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358293, 358287, H04N 140

Patent

active

047588977

ABSTRACT:
According to a method and apparatus for estimating a halftone image, a unit area is set and shifted by a focusing lens and a photoelectric transducer in a binary image consisting of black and white regions, and the halftone image is estimated on the basis of a ratio of the white regions to the black regions within each unit area. The number of white pixels is counted by an A/D converter. When different unit areas are used, a specific one satisfying predetermined conditions is selected and shifted in the binary image, and prestored image data is read out from RAMs by column and row address generators and calculated to obtain a halftone estimated value within each unit area. The binary image can be thus a Bayer dither image or a digital binary image.

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

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