基于OPENCV，实现不同梯度算子的边缘提取，其中包括最基本的像素操作，适合初学图像处理。-Based on OPENCV, the realization of different gradient operator edge extraction, including pixel operation is the most basic, suitable for beginners of image processing.

计算图像梯度幅度和相位，采用opencv算法。-Calculate the gradient magnitude and phase of the image