void plotHistogramToNewWindow(const Histogram& histogram,const char* histogramName)
{
const int hist_w = 400;
const int hist_h = 400;
Mat histImage( hist_w, hist_h, CV_8UC3, Scalar( 0,0,0) );
Mat r_hist, g_hist, b_hist, w_hist;
r_hist = histogram.getHistogramMat().clone();
g_hist = histogram.getHistogramMat().clone();
b_hist = histogram.getHistogramMat().clone();
w_hist = histogram.getHistogramMat().clone();
/// Normalize the result to [ 0, histImage.rows ]
normalize(r_hist, r_hist, 0, histImage.rows, NORM_MINMAX, -1, Mat() );
normalize(g_hist, g_hist, 0, histImage.rows, NORM_MINMAX, -1, Mat() );
normalize(b_hist, b_hist, 0, histImage.rows, NORM_MINMAX, -1, Mat() );
normalize(w_hist, w_hist, 0, histImage.rows, NORM_MINMAX, -1, Mat() );
int bin_w = cvRound( (double) hist_w/w_hist.rows );
/// Draw for each channel
for( int i = 1; i < w_hist.rows; i++ )
{
line( histImage, Point( bin_w*(i-1), hist_h - cvRound(r_hist.at<float>(i-1)) ) ,
Point( bin_w*(i), hist_h - cvRound(r_hist.at<float>(i)) ),
Scalar( 0, 0, 255), 2, 8, 0 );
line( histImage, Point( bin_w*(i-1), hist_h - cvRound(g_hist.at<float>(i-1)) ) ,
Point( bin_w*(i), hist_h - cvRound(g_hist.at<float>(i)) ),
Scalar( 0, 255, 0), 2, 8, 0 );
line( histImage, Point( bin_w*(i-1), hist_h - cvRound(b_hist.at<float>(i-1)) ) ,
Point( bin_w*(i), hist_h - cvRound(b_hist.at<float>(i)) ),
Scalar( 255, 0, 0), 2, 8, 0 );
line( histImage, Point( bin_w*(i-1), hist_h - cvRound(b_hist.at<float>(i-1)) ) ,
Point( bin_w*(i), hist_h - cvRound(b_hist.at<float>(i)) ),
Scalar( 200, 200, 200), 2, 8, 0 );
}
/// Display
std::string str = "Histogram:";
str += histogramName;
namedWindow(str, CV_WINDOW_AUTOSIZE );
imshow(str, histImage );
}
