Technique for DC restoration in AC coupled display systems

Details Technique for DC restoration in AC coupled display systems Technique for DC restoration in AC coupled display systems

1979-02-16

1980-07-22

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358171, 358113, H04N 516, H04N 533

Patent

active

042142717

ABSTRACT:
A technique for DC restoration in AC coupled display systems which includes istogramming, more specifically calculation of histogram values, of the difference in gray levels between two adjacent picture lines on a picture element by picture element (PIXEL-by-PIXEL) basis. The gray level obtaining the maximum number of occurrences is considered the mode of the histogram values. This mode used as an addition factor to every PIXEL of one of the lines, to add a predominating background level or DC component thereto, which is used to create the difference of gray levels between the next two adjacent picture lines. This addition sequence is carried on throughout the entire image frame.

REFERENCES:
patent: 3979555 (1976-09-01), Opittek et al.
patent: 3983320 (1976-09-01), Ketcham et al.

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