OpenCV-core-Adding (blending) two images using OpenCV

  • Goal

  • Theory


  • Code

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/**
* @file AddingImages.cpp
* @brief Simple linear blender ( dst = alpha*src1 + beta*src2 )
* @author OpenCV team
*/
#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
#include <iostream>

using namespace cv;
using namespace std;

/**
* @function main
* @brief Main function
*/
int main( void )
{
double alpha = 0.5; double beta; double input;

Mat src1, src2, dst;

/// Ask the user enter alpha
cout << " Simple Linear Blender " << endl;
cout << "-----------------------" << endl;
cout << "* Enter alpha [0.0-1.0]: ";
cin >> input;

// We use the alpha provided by the user if it is between 0 and 1
if( input >= 0 && input <= 1 )
{ alpha = input; }

//![load]
/// Read images ( both have to be of the same size and type )
src1 = imread( "../data/LinuxLogo.jpg" );
src2 = imread( "../data/WindowsLogo.jpg" );
//![load]

if( src1.empty() ) { cout << "Error loading src1" << endl; return -1; }
if( src2.empty() ) { cout << "Error loading src2" << endl; return -1; }

//![blend_images]
beta = ( 1.0 - alpha );
addWeighted( src1, alpha, src2, beta, 0.0, dst);
//![blend_images]

//![display]
imshow( "Linear Blend", dst );
waitKey(0);
//![display]

return 0;
}
  • Explanation


  • Result