图像融合 alpha (含代码)

　　在VisualStudio2008+openCV下实现的代码如下：

// alphaBlending.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<cv.h>
#include<cxcore.h>
#include<highgui.h>

IplImage *alphaBlending(IplImage *src1,IplImage *src2,double winSize)
{
    if(src1->height!=src2->height||src1->width!=src2->width)
    {
        //the height and weight of two images must agree to blend
        return 0;
    }
    int w=src1->width,h=src1->height;
    int winStart=(int)(w*winSize/2),winEnd=(int)(w-winStart);
    IplImage *dst=cvCreateImage(cvGetSize(src1),IPL_DEPTH_8U,3);
    for(int i=0;i<h;i++)
    {
        for(int j=0;j<w;j++)
        {
            CvScalar p1,p2,p;
            double a=0;
            if(j>winEnd)
            {
                a=1;
            }
            else if(j>winStart)
            {
                a=(j-winStart)/(double)(winEnd-winStart);
            }
            
            p1=cvGet2D(src1,i,j);
            p2=cvGet2D(src2,i,j);
            for(int k=0;k<3;k++)
            {
                p.val[k]=a*p2.val[k]+(1-a)*p1.val[k];
            }
            cvSet2D(dst,i,j,p);
        }
    }
    return dst;
}


int _tmain(int argc, _TCHAR* argv[])
{
    IplImage *src1=cvLoadImage("apple.jpg");
    IplImage *src2=cvLoadImage("orange.jpg");
    IplImage *dst=alphaBlending(src1,src2,0.9);
    cvNamedWindow("左图片");
    cvNamedWindow("右图片");
    cvNamedWindow("混合图片");
    cvShowImage("左图片",src1);
    cvShowImage("右图片",src2);
    cvShowImage("混合图片",dst);
    cvWaitKey(0);
    return 0;
}