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.