Non-Photorealistic Rendering

// Non-Photorealistic Rendering using OpenCV
// using OpenCV 3.0 Version
 
#include <cv.hpp>
 
using namespace std;
using namespace cv;
 
int main()
{
    Mat im = imread("img/cow.jpg");
    Mat imout, imout_gray;
 
    // Edge preserving filter with two different flags;
    edgePreservingFilter(im, imout, RECURS_FILTER);
    imwrite("img/edge-preserving-recursive-filter.jpg", imout);
 
    edgePreservingFilter(im, imout, NORMCONV_FILTER);
    imwrite("img/edge-preserving-normlized-convolution-filter.jpg", imout);
 
    // Detail enhance filter
    detailEnhance(im, imout);
    imwrite("img/detail-enhance.jpg", imout);
 
    // Pencil sketch filter
    pencilSketch(im, imout_gray, imout);
    imwrite("img/pencil-sketch.jpg", imout_gray);
 
    // stylization filter
    stylization(im, imout);
    imwrite("img/stylization.jpg", imout);
}

Domain Transform for Edge-aware Filtering