Patent Document ID: 8774554
Application ID: 13352765
Patent Status: 1

Claim One:
1. A method of enhancing an image comprising the steps of: dividing a previous image into multiple tiles: constructing a histogram for each tile, wherein the histogram represents a distribution of pixel intensity values in each tile; applying a bias value to the histogram; applying a plateau value to the histogram; constructing a cumulative distribution function (CDF) for each tile, after applying the bias value and the plateau value to the histogram; receiving a present image; determining an intensity value for a pixel in the present image; finding four adjacent tiles in the previous image that surround the pixel in the present image; transforming the intensity value of the pixel in the present image based on respective CDFs constructed for the four adjacent tiles in the previous image to obtain four intensity levels; and using bilinear interpolation to calculate a single intensity value of the pixel in the present image based on the four intensity levels.