Image-dependent automatic area of interest enhancement

Details Image-dependent automatic area of interest enhancement Image-dependent automatic area of interest enhancement

1995-06-05

1996-12-03

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358445, 358520, 382254, H04N 140, G06K 940

Patent

active

055813704

ABSTRACT:
A method of improving the contrast in a natural scene image. A relevant histogram of the image is derived for from a selected subset of local histograms representing regions of the image. The signal describing the histogram is operated on with a filter having the characteristic of weakening strong peaks and valleys in the function, but not effecting flat portions of the signal. The filtered histogram signal is used for controlling the TRC mapping in a device at which the image is to be printed. To assure optimum selection of local histograms, regions including the black point and white point of an image are determined and added to the subset of local histograms representing regions of the image.

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