图像反转、图像削波、图像阈值化、图像消除背景、图像保存背景、及灰度非线性变换（对数、指数、平方根）MATLAB程序实现。-Image reversal, image clipping, image threshold, the image to eliminate background, background images, and the grey nonlinear transform (logarithmic, index, square root) MATLAB implementation.