说明：  虽然这是一个用C语言编写的图像处理源码，但可以很简单能过MATLAB命令来调用即mex s_trans.c ，以后就直接可以用M语言来完成操作。它是用来得到一幅图像每个像素周围的信息量。
(Although this is a language with C-source image processing, but can be very easy to have MATLAB command to call that mex s_trans.c, since M can be used direct language to complete the operation. It is used to obtain an image of the amount of information around each pixel.s_trans delivers for each pixel an information about the surounding edge strength (L) und the surrounding edge position (s). )