void draw_Histogram(const cv::Mat &src_im, cv::Mat &hist_im){
//use filitchp made libraly
//github : "https://github.com/filitchp/opencv-histlib"
//
//引数 -> 入力画像，ヒストグラム用のMat型
cv::Mat dst;
if(src_im.channels() == 1) cv::cvtColor(src_im, dst, CV_GRAY2BGR);
else src_im.copyTo(dst);
CHistLib *Histogram = new CHistLib;
cv::MatND HistB, HistG, HistR;
Histogram->ComputeHistogramBGR(dst, HistB, HistG, HistR);
Histogram->DrawHistogramBGR(HistB, HistG, HistR, hist_im);
delete Histogram;
}
//-----------------------------------------------------------------------------
// Description:
// This example draws a color histogram from a photo. It is broken up into
// two steps to show how get access to the histogram vectors
//-----------------------------------------------------------------------------
void DrawPhotoBgrHistogram()
{
CHistLib Histogram;
// Open the image
Mat ImageBGR = imread("images/sunset.jpg");
assert(!ImageBGR.empty());
// Generate a color channel (BGR) histogram
Mat HistImageBGR;
MatND HistB;
MatND HistG;
MatND HistR;
Histogram.ComputeHistogramBGR(ImageBGR, HistB, HistG, HistR);
Histogram.DrawHistogramBGR(HistB, HistG, HistR, HistImageBGR);
// Save the histogram image
string ImageName("sunset.bgr.hist.png");
if (imwrite(ImageName, HistImageBGR))
{
cout << "Created BGR histogram: " << ImageName << endl;
}
}