Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1993-04-07
1995-03-07
Groody, James J.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348674, 348673, H04N 557
Patent
active
053963008
ABSTRACT:
A contrast correction device for correcting a contrast of an image formed by video signals includes a brightness/darkness detecting circuit for detecting a tone level of the image and for producing a bright signal when the tone level is greater than a predetermined brightness, and a dark signal when the tone level is less than a predetermined darkness. A correction circuit is provided for correcting a luminance signal by a negative gamma correction in response to the bright signal, and a positive gamma correction in response to the dark signal. Thus, the contrast of bright areas in the image are enhanced when the bright signal is produced, and the contrast of bright areas in the image are suppressed when the dark signal is produced.
REFERENCES:
patent: 4489349 (1984-12-01), Okada
patent: 4686562 (1987-08-01), Yamanaka
patent: 4799106 (1989-01-01), Moore
patent: 4829381 (1989-05-01), Song
patent: 4980756 (1990-12-01), Lagoni
patent: 5003394 (1991-03-01), Lagoni
Groody James J.
Hsia Sherrie
Matsushita Electric - Industrial Co., Ltd.
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