中文说明：log算子，canny算子的程序实现，不是调用的matlab库函数编的程序，直接编的源程序，并带有测试图，经过运行后，正常显示
English Description：
Operator log, canny operator program that instead of calling the MATLAB library functions developed the procedure directly part of the source, with a test chart, after running, the normal display