Gradation compensation apparatus of video image

Details Gradation compensation apparatus of video image Gradation compensation apparatus of video image

1992-12-18

1994-03-22

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358455, 358447, 358443, 358479, 382 51, 348571, H04N 140

Patent

active

052969410

ABSTRACT:
A level of an input luminance signal for a pixel is compared with step values which change stepwise in level in a predetermined range of level, and distribution of the levels of the input luminance signal in the predetermined range of level is represented by a cumulative histogram. Subsequently, a histogram value is derived from the outline of the cumulative histogram, and a compensation value is produced on the basis of the histogram value, and the compensation value is added to the input luminance signal, and hence a compensated luminance signal is output to control the luminance of a video image.

REFERENCES:
patent: 4731671 (1988-03-01), Alkofer
patent: 5068718 (1991-11-01), Iwabe et al.
patent: 5241386 (1993-08-01), Tsuji
Patent Abstracts of Japan vol. 15, No. 334(E-1104) Aug. 1991 JP-A-3-126377.
A. Canas, "Interactive contrast enhancement using an electronic hardware system", Journal of Physics E. Scient. Instruments, Jun. 1984, pp. 533-538.

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