Learning immediately: https://edu.csdn.net/course/play/26281/327081?utm_source=blogtoedu
1. The histogram is a description of the statistical characteristics of image gradation. As can be seen the distribution of grayscale images.
FIG high contrast though seems clear, but more noise.
2. Histogram equalization:
Action: image enhancement, the contrast increases, the noise is obvious disadvantage.
3. The local histogram equalization: a dark portion can improve the quality.
Question: had no problem areas will have stripes.
Solution: Enhanced grayscale using local histogram statistics.
