Method and apparatus for selectively adjusting the brightness of

Details Method and apparatus for selectively adjusting the brightness of Method and apparatus for selectively adjusting the brightness of

1991-06-27

1993-08-10

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, 358465, 382 52, 382 54, H04N 140, G06K 938, G06K 940

Patent

active

052354342

ABSTRACT:
The invention concerns a method for rendering scene information in images having a large dynamic range, i.e. sunny and shady areas. The method takes particular advantage of image segmentation and computations employed in compression of images for electronic still photography. In distinguishing large areas, the method selectively adjusts the brightness of all portions of the area without necessarily preserving contrast which avoids halo artifacts. Those portions in areas of intermediate size are subjected to a smoothing feature which avoids the production of artifacts in the form of a line at the boundary.

REFERENCES:
patent: 4703363 (1987-10-01), Kitamura
patent: 4747156 (1988-05-01), Wahl
patent: 4841374 (1989-06-01), Kotani et al.
patent: 4903316 (1990-02-01), Hongo et al.
patent: 4999629 (1991-03-01), Katsuta

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