Patent ID: 9330445
Filing Date: 2016-05-03
CPC Classification: G06K,G06T

Claim Text:
1. A local enhancement method, comprising the steps of: dividing an image into a plurality of blocks, which include at least a first block a second block and a third block; generating histograms of the blocks respectively; generating enhancement functions of the blocks respectively based on the corresponding histograms, wherein the enhancement functions include at least a first contrast enhancement function of the first block a second contrast enhancement function of the second block, and a third enhancement function of the third block; and for each pixel in the blocks: generating a first enhanced pixel value for a current pixel of the first block based on the first contrast enhancement; generating a second enhanced pixel value for the current pixel of the first block based on the second contrast function of the second block, wherein the second block is horizontally adjacent to the first block; generating a third enhanced pixel value for the current pixel based on the third enhancement function, wherein the third block is vertically adjacent to the first block; and generating a final enhanced pixel value for the current pixel based on the interpolation of the first enhanced pixel value the second enhanced pixel value, and the third enhanced pixel value.