使用直方图均衡化函数、图像调整函数和自适应直方图均衡化函数，编写用于增强索引图像对比度的程序，显示图像对比度增强效果-Using the histogram equalization function (histeq), image adjustment function (imadjust) and adaptive histogram equalization function (adapthisteq), prepared for image contrast enhancement index procedure, showing the image contrast enhancement