Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1992-06-25
1994-05-24
Groody, James J.
Television
Image signal processing circuitry specific to television
Gray scale transformation
382 18, H04N 5208
Patent
active
053153898
ABSTRACT:
The invention relates to an intensity correction device for automatically adjusting an intensity of an input video signal by detecting luminance characteristics of the input signal, and provide intensity correction with maintaining clear image by reducing magnitude of the correction signal or by not effecting correction when the luminance level of the input luminance signal is concentrated to a certain luminance level. The intensity correction device includes a histogram memory, a look-up table operating circuit, a look-up table, a maximum value detecting circuit, and an inverter and a multiplier, limiter, or a gain control circuit. By this, when a luminance level of the input video signal is concentrated to a certain luminance level, magnitude of the correction signal can be reduced or made zero. Therefore, by detecting the characteristics of the input image, the intensity of the input video signal can be automatically corrected to the optimal image for providing better picture quality.
REFERENCES:
patent: 4695884 (1987-09-01), Anastassiou
patent: 5133022 (1992-07-01), Weideman
patent: 5140649 (1992-08-01), Kageyama
patent: 5239378 (1993-08-01), Tsuji et al.
patent: 5241386 (1993-08-01), Tsuji et al.
Proc. SPIE-Int. Soc. Opt. Eng., vol. 575, Aug. 1985 pp. 106-113, O'Gorman et al., "Entropy-Constant Image Enhancement by Histogram Transformation."
Izawa Yosuke
Okumura Naoji
Grant Chris
Groody James J.
Matsushita Electric - Industrial Co., Ltd.
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