// PS_Algorithm.h
#ifndef PS_ALGORITHM_H_INCLUDED
#define PS_ALGORITHM_H_INCLUDED
#include <iostream>#include <string>
#include "cv.h"
#include "highgui.h"
#include "cxmat.hpp"
#include "cxcore.hpp"
using namespace std;using namespace cv;
#endif // PS_ALGORITHM_H_INCLUDED
/*
The program will transfor the color
image to the gray image.
The image must be color image.
*/
#include "PS_Algorithm.h"
int main()
{
string Image_name("2.jpg");
Mat Image=imread(Image_name.c_str());
Mat Image_test(Image.size(),CV_32FC3);
Image.convertTo(Image_test, CV_32FC3);
Mat Gray_img(Image_test.size(), CV_32FC1);
Mat r,g,b;
Gray_img.copyTo(r);
g=r;
b=r;
Mat bgr[]={b,g,r};
split(Image_test, bgr);
b=bgr[0];
g=bgr[1];
r=bgr[2];
Mat I1,I2,I3;
I1=r;
I2=r;
I3=r;
// I=0.299*R+0.587*G+0.144*B 方案一
Gray_img=(0.299*r+0.587*g+0.144*b);
I1=Gray_img/255;
imshow("I1", I1);
// I=(R+G+B)/3 方案二
Gray_img=(0.333*r+0.333*g+0.333*b);
I2=Gray_img/255;
for(int i=100; i<105; i++)
for(int j=100; j<105; j++)
cout<<I2.at<float>(i,j)<<endl;
imshow ("I2", I2);
// I=max(R,G,B) 方案三
float *p1,*p2,*p3,*p;
p1=r.ptr<float>(0);
p2=g.ptr<float>(0);
p3=b.ptr<float>(0);
p=I3.ptr<float>(0);
int nums;
nums=Gray_img.rows*Gray_img.cols;
for (int i=0; i<nums; i++)
p[i]=max(p1[i],max(p2[i],p3[i]))/255;
imshow("I3",I3);
cout<<"All is well."<<endl;
waitKey();
}