Method and device for level correction for a television image

Details Method and device for level correction for a television image Method and device for level correction for a television image

1984-05-08

1987-01-06

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358163, 358 55, H04N 514

Patent

active

046351175

ABSTRACT:
The system performs a correction on the video frequency signal of a television image, for the purpose of avoiding level defects in the image. The method principally consists in defining a particular number of correction points in the image by division into a grid or lattice of horizontal and vertical strips or bands, in imparting to the divisions of this grid a smaller value towards the edges of the image than close to the center, in storing correction signals for each correction point during an acquisition procedure, and in correcting the video frequency signals relating to a correction point by using the correction signal stored for this point.

REFERENCES:
patent: 4544952 (1985-10-01), Pham van Cang

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