图像灰度级均衡化，图像的灰度变换法和直方图均衡化法，加深对灰度直方图的理解。观察图像的增强效果，对灰度级修正前后的图像加以比较-Balanced gray-scale images, and images of gray-scale transformation method and histogram equalization method to enhance the understanding of the histogram. Observation of the effect of i