OpenCV Sobel 导数

 #include "opencv2/imgproc/imgproc.hpp"
 #include "opencv2/highgui/highgui.hpp"
 #include <stdlib.h>
 #include <stdio.h>

 using namespace cv;

 /** @function main */
 int main( int argc, char** argv )
 {

   Mat src, src_gray;
   Mat grad;
   char* window_name = "Sobel Demo - Simple Edge Detector";
   int scale = ;
   int delta = ;
   int ddepth = CV_16S;

   int c;

   /// 装载图像
   src = imread( argv[] );

   if( !src.data )
   { return -; }

   GaussianBlur( src, src, Size(,), , , BORDER_DEFAULT );

   /// 转换为灰度图
   cvtColor( src, src_gray, CV_RGB2GRAY );

   /// 创建显示窗口
   namedWindow( window_name, CV_WINDOW_AUTOSIZE );

   /// 创建 grad_x 和 grad_y 矩阵
   Mat grad_x, grad_y;
   Mat abs_grad_x, abs_grad_y;

   /// 求 X方向梯度
   //Scharr( src_gray, grad_x, ddepth, 1, 0, scale, delta, BORDER_DEFAULT );
   Sobel( src_gray, grad_x, ddepth, , , , scale, delta, BORDER_DEFAULT );
   convertScaleAbs( grad_x, abs_grad_x );

   /// 求Y方向梯度
   //Scharr( src_gray, grad_y, ddepth, 0, 1, scale, delta, BORDER_DEFAULT );
   Sobel( src_gray, grad_y, ddepth, , , , scale, delta, BORDER_DEFAULT );
   convertScaleAbs( grad_y, abs_grad_y );

   /// 合并梯度(近似)
   addWeighted( abs_grad_x, 0.5, abs_grad_y, 0.5, , grad );

   imshow( window_name, grad );

   waitKey();

   return ;
   }