OpenCV自带例子（三）两幅图像相加

#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 >= 0 && alpha <= 1 )
	{ 
		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 -1; }
	if( !src2.data ) { printf("Error loading src2 n"); return -1; }
	/// Create Windows
	namedWindow("Linear Blend", 1);
	beta = ( 1.0 - alpha );
	addWeighted( src1, alpha, src2, beta, 0.0, dst);
	imshow( "Linear Blend", dst );
	waitKey(0);
	return 0;
}

g(x) = alpha*f1(x) + beta*f2(x) + gamma

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