OpenCV——PS滤镜，渐变映射

// define head function

#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;

void Show_Image(Mat&, const string &);

#endif // PS_ALGORITHM_H_INCLUDED

/*

This program will generate

 "Shade" effect.

*/

#include "PS_Algorithm.h"

#include <time.h>

using namespace std;

using namespace cv;

int main(void)

{

    string Img_name("4.jpg");

    Mat Image_in;

    Image_in=imread(Img_name);

    Show_Image(Image_in, Img_name);

    Mat Image_out(Image_in.size(), CV_32FC3);

    Image_in.convertTo(Image_out, CV_32FC3);

    Mat Image_2(Image_in.size(), CV_32FC3);

    Image_in.convertTo(Image_2, CV_32FC3);

    Mat Map(Image_in.size(), CV_32FC3);

    Mat temp;

    float val;

    // build the mapping table

    /*

    for (int i=0; i<Image_2.rows; i++)

    {

        temp=Map.row(i);

        val=(float)(i)/(float)Image_2.rows;

        temp.setTo(Scalar(val,val,val));

    }

    */

    // build the mapping talbe

    for (int i=0; i<Image_2.cols; i++)

    {

        temp=Map.col(i);

        val=1-std::abs((float)(i)/((float)Image_2.cols/2)-1);

        temp.setTo(Scalar(val,val,val));

    }

    Show_Image(Map, "Map");

    cv::multiply(Image_2, Map, Image_out);

    Image_out=Image_out/255.0;

    Show_Image(Image_out, "out");

    imwrite("out.jpg", Image_out*255);

    waitKey();

    cout<<"All is well."<<endl;

}

#include "PS_Algorithm.h"

#include <iostream>

#include <string>

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);

}
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巴特西

OpenCV——PS滤镜，渐变映射

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