Shade gradation correction method and apparatus

Details Shade gradation correction method and apparatus Shade gradation correction method and apparatus

1996-05-15

1999-07-27

Vu, Kim Yen

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

358516, 358519, H04N 160

Patent

active

059304014

ABSTRACT:
A detecting unit generates defference data between optical black level of digital input data and a predetermined black level and generates .gamma. characteristics selection signal. An offset signal obtained from the difference is added to the input data by an adding circuit. A .gamma. characteristics setting unit is supplied with the difference data and the output signal of the adding circuit and outputs a signal in which a white level, black level and .gamma. characteristics are corrected.

REFERENCES:
patent: 5038225 (1991-08-01), Maeshima
patent: 5206501 (1993-04-01), Sakakibara et al.
patent: 5260809 (1993-11-01), Tachikawa
patent: 5572337 (1996-11-01), Kajitani et al.
patent: 5594558 (1997-01-01), Usami et al.
patent: 5644409 (1997-07-01), Irie et al.
patent: 5661575 (1997-08-01), Yamashita et al.

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