本代码基于opencv2.2,使用时先将库文件加入输入链接。边缘方向直方图，在图像处理中经常会进行梯度操作得到方向角，此代码实现用直方图将方向角表示出来的功能。-The code is based on opencv2.2, use the first library file into the input link. Edge direction histogram, the image processing operations often get the direction of the

该段代码主要是获取图像的像素并写入本地文件中，包括灰度图和三通道图。-This code is mainly to get the image pixels and write local files, including grayscale and three-channel map.