Device for presenting and selectively altering the brightness of

Details Device for presenting and selectively altering the brightness of Device for presenting and selectively altering the brightness of

1986-10-01

1988-06-28

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358284, 382 27, H04N 514

Patent

active

047543329

ABSTRACT:
To alter the brightness of selected portions of an image a representation of the image is presented on a display and is stored in a memory. The image representation is divided into a number of fields. A user may select an arbitrary one of the fields and indicate a desired change in its brightness, as presented on the display, by means of a field selector and correction keys. Each such change is also registered as a change in values stored in a corresponding region of the memory. Using interpolation, a control unit automatically modifies the brightness level of non-central portions of the selected image field, and of image fields adjacent to it, in order to eliminate sharp and obvious transitions in brightness at the borders of the respective fields.

REFERENCES:
patent: 3257506 (1966-06-01), Siepmann
patent: 3936800 (1976-02-01), Ejiri et al.
patent: 4021607 (1977-05-01), Amano
patent: 4589140 (1986-05-01), Bishop et al.
patent: 4654722 (1987-03-01), Alkofer

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