Introduction - If you have any usage issues, please Google them yourself
Image preprocessing, the commonly used histogram equalization [1] and histogram specification, linear and nonlinear gray level transformation method [2] to improve the image contrast, but the results are not satisfactory. It presents a contrast enhancement algorithm. In this algorithm the histogram is smoothed to eliminate the histogram due to the introduction of random noise and interference points, followed by histogram equalization, increases the contrast of the image, then in the context of the show were equally spaced gray level image arrangement, the output gray level dynamic range for maximum gray level range, and finally to the whole image median filter, filter out the noise image is enhanced.