Introduction - If you have any usage issues, please Google them yourself
If an image pixel occupies a lot of gray level and evenly distributed, so such images tend to have high contrast and varying shades of gray. Histogram equalization is a kind of input image histogram information alone can automatically achieve this effect transformation function. Its basic idea is the number of pixels in an image more gray-level broadening, while the number of pixels in the image of a small gray compress like to extend the dynamic range of the original value, improved contrast and gray tones changes to make the image clearer.