opencv调节图片饱和度_OpenCV——饱和度调整
参考：
// define head function
#ifndef PS_ALGORITHM_H_INCLUDED
#define PS_ALGORITHM_H_INCLUDED
#include
#include
#include "cv.h"
#include "highgui.h"
#include "cxmat.hpp"
#include "cxcore.hpp"
using namespace std;
using namespace cv;
void Show_Image(Mat&, const string &);
#endif // PS_ALGORITHM_H_INCLUDED
/*
This program adjust
the saturation.
*/
#include "PS_Algorithm.h"
#include
using namespace std;
using namespace cv;
int main(void)
{
string Img_name("4.jpg");
Mat Img;
Img=imread(Img_name);
Show_Image(Img, Img_name);
Mat Img_out(Img.size(), CV_32FC3);
Img.convertTo(Img_out, CV_32FC3);
Mat Img_in(Img.size(), CV_32FC3);
Img.convertTo(Img_in, CV_32FC3);
// define the iterator of the input image
MatIterator_ inp_begin, inp_end;
inp_begin=Img_in.begin();
inp_end =Img_in.end();
// define the iterator of the output image
MatIterator_ out_begin, out_end;
out_begin=Img_out.begin();
out_end =Img_out.end();
// increment (-100.0, 100.0)
float Increment=-50.0/100.0;
float delta=0;
float minVal, maxVal;
float t1, t2, t3;
float L,S;
float alpha;
for(; inp_begin!=inp_end; inp_begin++, out_begin++)
{
t1=(*inp_begin)[0];
t2=(*inp_begin)[1];
t3=(*inp_begin)[2];
minVal=std::min(std::min(t1,t2),t3);
maxVal=std::max(std::max(t1,t2),t3);
delta=(maxVal-minVal)/255.0;
L=0.5*(maxVal+minVal)/255.0;
S=std::max(0.5*delta/L, 0.5*delta/(1-L));
if (Increment>0)
{
alpha=max(S, 1-Increment);
alpha=1.0/alpha-1;
(*out_begin)[0]=(*inp_begin)[0]+((*inp_begin)[0]-L*255.0)*alpha;
(*out_begin)[1]=(*inp_begin)[1]+((*inp_begin)[1]-L*255.0)*alpha;
(*out_begin)[2]=(*inp_begin)[2]+((*inp_begin)[2]-L*255.0)*alpha;
}
else
{
alpha=Increment;
(*out_begin)[0]=L*255.0+((*inp_begin)[0]-L*255.0)*(1+alpha);
(*out_begin)[1]=L*255.0+((*inp_begin)[1]-L*255.0)*(1+alpha);
(*out_begin)[2]=L*255.0+((*inp_begin)[2]-L*255.0)*(1+alpha);
}
}
Img_out=Img_out/255.0;
Show_Image(Img_out, "out");
imwrite("out.jpg", Img_out*255);
waitKey();
cout<
}
// define the show image
#include "PS_Algorithm.h"
#include
#include
using namespace std;
using namespace cv;
void Show_Image(Mat& Image, const string& str)
{
namedWindow(str.c_str(),CV_WINDOW_AUTOSIZE);
imshow(str.c_str(), Image);
}
原图
效果图
