说明：  我编的双阈值加上小波变换高斯小波，相当于 Canny 算法，编的很粗糙只是出效果了，但好用对那些哄弄毕业的很有帮助，重要参考，
(I made the dual-threshold wavelet transform together with the Gaussian wavelet, which is equivalent to Canny algorithm, made only a very rough effect, but handy for those who do graduate to coax helpful, it is important to reference,)