extract fhog with dlib and openframeworks

fhogOF.cpp

void drawFHOG(ofPixels store, int x, int y)
{
        ofPixels pix;
        ofImage debug;

        ofPushMatrix();
        array2d<matrix<float,31,1> > hog;
        array2d<rgb_pixel> img;

        toDLib(store,img);//<-- view ofxDLib
        
        extract_fhog_features(img, hog);
        matrix<unsigned char> df = draw_fhog(hog);
        int hf = df.nr();
        int wf = df.nc();
        pix.allocate(wf, hf, OF_IMAGE_COLOR);
        for(int r = 0; r < hf; r++)
        {
                for(int c = 0; c < wf; c++)
                {
                        pix.setColor(c, r, ofColor(df(r,c)));
                }
        }
        debug = pix;
        debug.draw(x,y);

        ofPopMatrix();
}