有限对比适应性均衡化是一种有约束的局部直方图构造方法，而不是全局。在高亮区和暗区的增强能力要远优于常规的直方图均衡化，图像视觉效果更加清晰。-Finite contrast adaptive equalization is a constrained local histogram construction method, rather than a global. The enhancement capability of the highlighted area and dark region is much better than the conventional histogram equalization, and the image visual effect is more clear.