Method and apparatus for improving image quality

Details Method and apparatus for improving image quality Method and apparatus for improving image quality

1994-06-23

1996-01-02

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358458, H04N 140

Patent

active

054813760

ABSTRACT:
The present invention provides a method for improving the quality of an image having a plurality of pixels by enhancing the contrast of the image, including the steps of: subtracting a gray-scale level of the original image at a first pixel from a gray-scale level of the original image at a second pixel, so as to produce a difference .DELTA.G; multiplying the difference .DELTA.G by N, so as to produce a value .DELTA.GN; and determining a gray-scale level of an image with enhanced contrast at the second pixel depending on the gray-scale level of the image with enhanced contrast at the first pixel and the value .DELTA.GN.

REFERENCES:
patent: 5144687 (1992-09-01), Honda
patent: 5157740 (1992-10-01), Klein et al.
patent: 5285854 (1993-11-01), Eschbach

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