Apparatus and method for contrast adjustment based on single fac

Details Apparatus and method for contrast adjustment based on single fac Apparatus and method for contrast adjustment based on single fac

1996-10-23

1998-09-01

Vu, Kim Yen

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

382274, 358446, 348673, H04N 1407

Patent

active

058022163

ABSTRACT:
An apparatus and a method for contrast adjustment are provided which require a reduced amount of information for the contrast adjustment. A preliminary adjustment factor is first calculated on the basis of a contrast adjustment factor, and then input image data is processed on the basis of these two adjustment factors to provide contrast-adjusted image data. For example, the inclination of a contrast adjustment line is defined by the contrast adjustment factor, and a shift amount (intercept) of the contrast adjustment line is defined by the preliminary adjustment factor which is properly determined in correspondence with the contrast adjustment factor. Thus, not only the contrast of an image but also the density of the overall image can be properly adjusted simply by specifying a single adjustment factor.

REFERENCES:
patent: 4812903 (1989-03-01), Wagensonner et al.
patent: 4969051 (1990-11-01), Sasaki
patent: 5404163 (1995-04-01), Kubo
patent: 5502776 (1996-03-01), Manabe
patent: 5619229 (1997-04-01), Kumaki

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