CvFilter2D example source code, various Filter masks

double K[] = { 1, 2, 1, 2, 4, 2, 1, 2, 1 };

float t=0;
for(int i=0; i< (3*3); ++i)
     t = t + K[i];
for(int i=0; i< (3*3); ++i)
     K[i] = K[i] / t;

CvMat Kernel=cvMat(3, 3, CV_64FC1, K); 
cvFilter2D(InputImg,OutputImg, &Kernel);

various type of filter mask

 

Gaussian Filter 

Average Filter

High pass Filter

Horizontal Prewitt Filter

Vertical Prewitt Filter

Horizontal Sobel Filter

Vertical Sobel Filter

Laplacian Filter

Sharpen Filter

 

Sharpen Low Filter