Image-dependent sharpness enhancement

Details Image-dependent sharpness enhancement Image-dependent sharpness enhancement

1993-11-05

1994-11-08

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, 358518, H04N 140

Patent

active

053632095

ABSTRACT:
A method of altering the sharpness in the reproduction of an electronically encoded natural scene image, including process steps of: a) converting the signals to a luminance-chrominance signal format, wherein at least one signal represents overall image intensity; b) determining the maximum local contrast within the image; c) determining a filter function applicable to the image which increases maximum local contrast to a predetermined target value, and all other contrast to an amount proportional thereto; and d) applying the determined filter function to the image to increase sharpness thereof.

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