Method and device for eliminating the background brightness vari

Details Method and device for eliminating the background brightness vari Method and device for eliminating the background brightness vari

1978-05-22

1980-05-27

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358160, H04N 514

Patent

active

042053455

ABSTRACT:
Method and device for eliminating the background brightness variation of a video signal, in which the background brightness in each line of the frame of a video signal has its low frequency brightness signal a(t) limited, as well as being limited by its deviation from the limited brightness of the preceding line of frame. This can be expressed mathematically by stating that .vertline.V(t)-a(t).vertline. is minimized by means of a(t) on the marginal conditions

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