Method and apparatus for contrast processing a video signal incl

Television – Image signal processing circuitry specific to television – Gray scale transformation

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348603, H04N 552, H04N 557, H04N 558

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active

057608431

ABSTRACT:
A method and an apparatus performs contrast processing so that the contrast of a video signal displayed on a low contrast display device is improved. The apparatus and method prevent the picture from becoming whitish and from having its apparent contrast reduced, even when external light is present. The apparatus comprises a brightness level converting part for converting the brightness level of a picture to a brightness level which can be displayed with a low contrast display device. The apparatus further includes a contrast improving part for improving the contrast by superimposing a waveform on the input signal to create an optical illusion of a brightness level. A brightness level compensating part is also provided for compensating the brightness value of the light and dark parts of the brightness varying portions in the video input signal so that the light parts get darker and the dark parts get lighter.

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patent: 5200829 (1993-04-01), Lagoni
patent: 5410364 (1995-04-01), Karlock
V. O'Brien, "Contour Perception, Illusion and Reality", Journal of the Optical Society of America, vol. 48, No. 2, pp. 112-119, Feb. 1958.
D. Burr, "Implications of the Craik-O'Brien Illusion for Brightness Perception", Vision Research, vol. 27, No. 11, pp. 1903-1905 and 1907-1913 .

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