OpenCV 对两幅图像求和（求混合(blending)）

 #include <cv.h>
 #include <highgui.h>
 #include <iostream>

 using namespace cv;

 int main( int argc, char** argv )
 {
  double alpha = 0.5; double beta; double input;

  Mat src1, src2, dst;

  /// Ask the user enter alpha
  std::cout<<" Simple Linear Blender "<<std::endl;
  std::cout<<"-----------------------"<<std::endl;
  std::cout<<"* Enter alpha [0-1]: ";
  std::cin>>input;

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

  /// Read image ( same size, same type )
  src1 = imread("../../images/LinuxLogo.jpg");
  src2 = imread("../../images/WindowsLogo.jpg");

  if( !src1.data ) { printf("Error loading src1 \n"); return -; }
  if( !src2.data ) { printf("Error loading src2 \n"); return -; }

  /// Create Windows
  namedWindow("Linear Blend", );

  beta = ( 1.0 - alpha );
  addWeighted( src1, alpha, src2, beta, 0.0, dst);

  imshow( "Linear Blend", dst );

  waitKey();
  return ;
 }