函数和参数说明：

void addWeighted(InputArray src1, double alpha, InputArray src2, double beta, double gamma, OutputArray dst, int dtype=-)

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 -, 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();

    namedWindow("原图2");

    imshow("原图2",Src2);

    waitKey();

    namedWindow("混合图");

    imshow("混合图",Dst);

    waitKey();

}