Bilevel image reducing and enlarging methods and apparatus

Details Bilevel image reducing and enlarging methods and apparatus Bilevel image reducing and enlarging methods and apparatus

1996-05-07

1997-10-28

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, H04N 712

Patent

active

056822510

ABSTRACT:
A bilevel image is reduced by dividing the image into N.times.N blocks of pixels, counting black pixels in each block, decrementing the black-pixel count if a certain delayed output value represents a black pixel, and generating an output value by comparing the resulting count with a threshold value. A bilevel image is enlarged by expanding each white pixel into an N.times.N block of white pixels, and each black pixel into an N.times.N block of pixels containing a non-zero number of black pixels, this non-zero number being a non-decreasing function of the number of black pixels in certain positions adjacent to the black pixel being expanded. N is an arbitrary integer greater than one.

REFERENCES:
patent: 4266249 (1981-05-01), Chai et al.
patent: 5317417 (1994-05-01), Yamamura et al.

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