Gradation compensation apparatus of video image

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

H - Electricity

04

N

H04N 9/64 (2006.01) H04N 5/20 (2006.01) H04N 9/68 (2006.01) H04N 9/77 (2006.01)

Patent

CA 2085754

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.

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