Gray level correction apparatus

Details Gray level correction apparatus Gray level correction apparatus

1995-07-20

1998-02-03

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358518, 358520, 358521, G03F 308

Patent

active

057153779

ABSTRACT:
An apparatus for printing video images is disclosed. First the percentage of backlighting or people in the image is detected. That is, the probability of the presence of backlighting or people is detected. Then, the density gradation table is modified based on the detection result, and the presence of backlighting or the presence of people in the image is evaluated based on optical information, to select the best density gradation table from among plural density gradation tables, or to synthesize the best density gradation table. A luminance table is generated using the optimized density gradation table, and gradation correction of the image is then accomplished using that luminance table.

REFERENCES:
patent: 4707119 (1987-11-01), Terashita
patent: 4792979 (1988-12-01), Nomura et al.
patent: 5012333 (1991-04-01), Lee et al.
patent: 5181105 (1993-01-01), Udagawa
patent: 5296920 (1994-03-01), Sakaue et al.
patent: 5317427 (1994-05-01), Ichikawa
patent: 5384601 (1995-01-01), Yamashita
patent: 5420704 (1995-05-01), Winkelman
patent: 5422738 (1995-06-01), Ishihara
patent: 5434683 (1995-07-01), Sekine
patent: 5450217 (1995-09-01), Eschbach

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