第二版冈萨雷斯数字图像处理中的timeit函数源码，替代了matlab本身的的tic和toc，计算出来的函数运行时间更加稳定，不会出现太大的波动。-Second Edition Gonzalez Digital Image Processing timeit function source, replacing the matlab itself the tic and toc, calculated as a function running time is more stable, does