Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1992-05-22
1994-02-22
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348607, H04N 514
Patent
active
052892824
ABSTRACT:
A video signal gradation corrector used in a television receiver or the like for preventing the destruction of the gradation of the black side and the floating of the luminance level of the black side and/or an excessive increase of the luminance level of the white side. The corrector can be realized with a small circuit scale. A histogram operating circuit includes an average luminance level detecting circuit. A constant is subtracted from an output signal of the average luminance level detecting circuit by a subtracter. The result of subtraction is multiplied by a constant by a constant-multiplication circuit. A lower-limit limiter circuit limits an output signal of the constant-multiplication circuit to a signal having a value not smaller than 0. An output signal of the lower-limit limiter circuit is provided as an accumulation start luminance level, thereby enabling a gradation correction in which the floating of the luminance level of the black side and the destruction of the gradation of the black side are prevented.
REFERENCES:
patent: 4695884 (1987-09-01), Anastassiou et al.
Imai Kiyoshi
Kageyama Atsuhisa
Tsuji Toshiaki
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
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