OpenCV——PS 图层混合算法（一）

具体的算法原理可以参考

PS图层混合算法之一（不透明度，正片叠底，颜色加深，颜色减淡）

// 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

// main function

#include "PS_Algorithm.h"

void Transparent(Mat& src1, Mat& src2, Mat& dst, double alpha);
void Multiply(Mat& src1, Mat& src2, Mat& dst);
void Color_Burn(Mat& src1, Mat& src2, Mat& dst);
void Color_Dodge(Mat& src1, Mat& src2, Mat& dst);

int main(void)
{
Mat Origin_Image1;
Mat Origin_Image2;
Origin_Image1=imread("2.jpg");
Origin_Image2=imread("3.jpg");
Mat Image_up(Origin_Image1.size(),CV_32FC3);
Mat Image_down(Origin_Image2.size(), CV_32FC3);
Origin_Image1.convertTo(Image_up,CV_32FC3);
Origin_Image2.convertTo(Image_down,CV_32FC3);
Image_up=Image_up/255;
Image_down=Image_down/255;
Mat Image_mix(Image_up);

//double alpha=0.25;
//Transparent(Image_up, Image_down, Image_mix, alpha);
//Multiply(Image_up, Image_down, Image_mix);
//Color_Burn(Image_up, Image_down, Image_mix);
//Color_Dodge(Image_up, Image_down, Image_mix);

namedWindow("Img", CV_WINDOW_AUTOSIZE);
imshow("Img",Image_mix);
waitKey();
cvDestroyWindow("Img");
cout<<"All is well."<<endl;
return 0;
}

// Transparent 不透明度
void Transparent(Mat& src1, Mat& src2, Mat& dst, double alpha)
{
dst=alpha*src1+(1-alpha)*src2;
}

// Multiply 正片叠底
void Multiply(Mat& src1, Mat& src2, Mat& dst)
{
for(int index_row=0; index_row<src1.rows; index_row++)
{
for(int index_col=0; index_col<src1.cols; index_col++)
{
for(int index_c=0; index_c<3; index_c++)
dst.at<Vec3f>(index_row, index_col)[index_c]=
src1.at<Vec3f>(index_row, index_col)[index_c]*
src2.at<Vec3f>(index_row, index_col)[index_c];
}
}
}

// Color_Burn 颜色加深
void Color_Burn(Mat& src1, Mat& src2, Mat& dst)
{
for(int index_row=0; index_row<src1.rows; index_row++)
{
for(int index_col=0; index_col<src1.cols; index_col++)
{
for(int index_c=0; index_c<3; index_c++)
dst.at<Vec3f>(index_row, index_col)[index_c]=1-
(1-src1.at<Vec3f>(index_row, index_col)[index_c])/
src2.at<Vec3f>(index_row, index_col)[index_c];
}
}
}

// Color_Dodge 颜色减淡
void Color_Dodge(Mat& src1, Mat& src2, Mat& dst)
{
for(int index_row=0; index_row<src1.rows; index_row++)
{
for(int index_col=0; index_col<src1.cols; index_col++)
{
for(int index_c=0; index_c<3; index_c++)
dst.at<Vec3f>(index_row, index_col)[index_c]=
src2.at<Vec3f>(index_row, index_col)[index_c]/
(1-src1.at<Vec3f>(index_row, index_col)[index_c]);
}
}
}

来源：https://www.cnblogs.com/mtcnn/p/9412701.html

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