LOCAL CONTRAST ENHANCEMENT METHOD AND APPARATUS

摘要

A local enhancement method is provided, including: dividing an image into a plurality of blocks, which include a first block and a second block adjacent to the first 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 and a second contrast enhancement function of the second 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; and generating a final enhanced pixel value for the current pixel based on the first and second enhanced pixel values.

主权项

1. A local enhancement method, comprising the steps of:
dividing an image into a plurality of blocks, which include at least a first block and a second 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 and a second contrast enhancement function of the second 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 adjacent to the first block; andgenerating a final enhanced pixel value for the current pixel based on the first enhanced pixel value and the second enhanced pixel value.