Method for correcting lightness of image

Details Method for correcting lightness of image Method for correcting lightness of image

2005-09-20

2005-09-20

Lee, Thomas D. (Department: 2624)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C382S279000

Reexamination Certificate

active

06947176

ABSTRACT:
A method is provided for correcting lightness of an image using a multiscale retinex. Lightness of a subject pixel of an original image is corrected using a convolution operation of a surround function and surround pixels with respect to the subject pixel of the original image, and the convolution operation is performed over a plurality of scales. The surround function has a simplified model such that a value of the surround function is changed in a stepwise way along two axes orthogonal to each other.

REFERENCES:
patent: 4384336 (1983-05-01), Frankle et al.
patent: 2003/0072496 (2003-04-01), Woodell et al.
patent: 2003/0138161 (2003-07-01), Rising, III
Daniel J. Johnson et al; IEE Transactions On Image Processing; vol. 6, No. 3; pp. 451-462 (Mar. 1997).
Daniel J. Johnson et al; IEE Transaction On Image Processing; vol. 6, No. 7; pp. 965- 976 (Jul. 1997).

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