Fourier变换在图像的处理上的有重要的作用，Sobel算子，Prewitt算子,Roberts算子，Laplace算子和Canny算子运算也是常用的图像边缘提取方法。-Fourier transform in image processing on an important role, Sobel operator, Prewitt operator, Roberts operator, Laplace operator and Canny operator op is also commonly used image edge extraction method.