中文说明：应用背景Matlab 程序代码是为大学学生理解的逻辑日志转换非常有用。关键技术
English Description：
Application backgroundMatlab code is very useful for college student to understand the logic of log transformation.Key Technology The general form of the log transformation is s = c log (1 + r) where c is a constant, and it is assumed that r 0.The shape of the log curve shows that this transformation maps a narrow range of low gray-level values in the input image into a wider range of output levels.The opposite is true of higher values of input levels.We would use a transformation of this type to expand the values of dark pixels in an image while compressing the higher-level values.The opposite is true of the inverse log transformation. Any curve having the general shape of the log functions would accomplish this spreading/compressing of gray levels in an image.