利用各种算子对图像进行边缘检测。如roberts算子、sobel算子、log算子、perwitt算子四种算子，利用这四种算子分别对图像进行边界的提取。-Using a variety of operators for image edge detection. Operators such as roberts, sobel operator, log operator, perwitt operator of four operators, the use of these four oper