OpenCV入门：（四：混合两张图片）

函数和参数说明：
void addWeighted(InputArray src1, double alpha, InputArray src2, double beta, double gamma, OutputArray dst, int dtype=-1)
src1     – first input array.
alpha     – weight of the first array elements.
src2     – second input array of the same size and channel number as src1.
beta    – weight of the second array elements.
dst     – output array that has the same size and number of channels as the input arrays.
gamma     – scalar added to each sum.
dtype     – optional depth of the output array; when both input arrays have the same depth, dtype can be set to -1, which will be equivalent to src1.depth().

void Blend(const Mat& Src1,const Mat& Src2,double alpha,Mat& Dst)
{
    double beta = 1.0 - alpha;
    addWeighted(Src1,alpha,Src2,beta,0.0,Dst);
    namedWindow("原图1");
    imshow("原图1",Src1);
    waitKey(0);
    namedWindow("原图2");
    imshow("原图2",Src2);    
    waitKey(0);
    namedWindow("混合图");
    imshow("混合图",Dst);
    waitKey(0);
}