cvRectangle( hist_image, cvPoint(i*bin_w, hist_image->height),
cvPoint((i+1)*bin_w, hist_image->height - cvRound(cvGetReal1D(hist->bins,i))),
cvScalarAll(0), -1, 8, 0 );
cvRectangle( hist_image, cvPoint(i*bin_w, hist_image->height),
cvPoint((i+1)*bin_w, hist_image->height - cvRound(cvGetReal1D(hist->bins,i))),
cvScalarAll(0), -1, 8, 0 );