Opencv— — Color Gradient

// 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"
#include "math.h"

using namespace std;
using namespace cv;

void Show_Image(Mat&, const string &);

#endif // PS_ALGORITHM_H_INCLUDED


#include "PS_Algorithm.h"
#include 

using namespace std;
using namespace cv;

#define pi 3.1415926

int main()
{
    string Img_name("4.jpg");
    Mat Img;
    Img=imread(Img_name);

    Mat Img_out(Img.size(), CV_8UC3);

    int width=Img.cols;
    int height=Img.rows;

    float rNW=1.0;     float gNW=0.0;    float bNW=0.0;
    float rNE=1.0;     float gNE=1.0;    float bNE=0.0;
    float rSW=0.0;     float gSW=0;      float bSW=1.0;
    float rSE=0.0;     float gSE=1.0;    float bSE=0.0;

    float fx, fy;
    float p, q, r, g, b;

    for (int y=0; y(y, x)[0]=b*255.0;
            Img_out.at(y, x)[1]=g*255.0;
            Img_out.at(y, x)[2]=r*255.0;

        }
    }

    Show_Image(Img_out, "out");
    cout<<"All is well"<
#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);

}