void MySobel(IplImage* gray, IplImage* gradient)
{
/* Sobel template
a00 a01 a02
a10 a11 a12
a20 a21 a22
*/
unsigned char a00, a01, a02;
unsigned char a10, a11, a12;
unsigned char a20, a21, a22;
CvScalar color ;
for (int i=1; i<gray->height-1; ++i)
{
for (int j=1; j<gray->width-1; ++j)
{
a00 = cvGet2D(gray, i-1, j-1).val[0];
a01 = cvGet2D(gray, i-1, j).val[0];
a02 = cvGet2D(gray, i-1, j+1).val[0];
a10 = cvGet2D(gray, i, j-1).val[0];
a11 = cvGet2D(gray, i, j).val[0];
a12 = cvGet2D(gray, i, j+1).val[0];
a20 = cvGet2D(gray, i+1, j-1).val[0];
a21 = cvGet2D(gray, i+1, j).val[0];
a22 = cvGet2D(gray, i+1, j+1).val[0];
// x方向上的近似导数
double ux = a20 * (1) + a21 * (2) + a22 * (1)
+ (a00 * (-1) + a01 * (-2) + a02 * (-1));
// y方向上的近似导数
double uy = a02 * (1) + a12 * (2) + a22 * (1)
+ a00 * (-1) + a10 * (-2) + a20 * (-1);
color.val[0] = sqrt(ux*ux + uy*uy);
cvSet2D(gradient, i, j, color);
}
}
}
//注释:该程序需要在安装Opencv软件下运行。
Matlab
ps=imread('D:\14.jpg'); %读取图像
subplot(1,3,1)
imshow(ps);
title('原图像');
ps=rgb2gray(ps);
[m,n]=size(ps); %用Sobel微分算子进行边缘检测
pa = edge(ps,'sobel');
subplot(1,3,2);
imshow(pa);
title('Sobel边缘检测得到的图像');