Method for adjusting image contrast

Details Method for adjusting image contrast Method for adjusting image contrast

2008-03-04

2008-03-04

Alavi, Amir (Department: 2624)

Image analysis

Histogram processing

With a gray-level transformation

C382S274000

Reexamination Certificate

active

11050772

ABSTRACT:
A method for adjusting image contrast has the steps of constructing a luminance histogram of an original image; acquiring an image characteristic of the luminance histogram; judging whether there is a peak wave or deviation of luminance existed in that image characteristic; determining a control point after performing a specific algorithm; deriving a linear equation from the control point and a contrast adjusting value in a Cartesian coordinate system; establishing a gamma table from the correspondent relationship between the horizontal and vertical axis in the coordinate, where the relationship can be calculated according to the linear equation; and finally generating a luminance value from the gamma look-up table using the input luminance of each pixel in the original image.

REFERENCES:
patent: 5799106 (1998-08-01), Mooney et al.
patent: 6148103 (2000-11-01), Nenonen
patent: 6694051 (2004-02-01), Yamazoe et al.
patent: 7199776 (2007-04-01), Ikeda et al.
patent: 2005/0163368 (2005-07-01), Hanamoto
patent: 2005/0213814 (2005-09-01), Lin
patent: 2006/0110022 (2006-05-01), Zhang et al.

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