OpenCV与c语言图像融合

原文：http://blog.csdn.net/mjlsuccess/article/details/12400787
//#include "blending.h"
#include <opencv2/core.hpp>
//#include <iostream>
#include <opencv2/opencv.hpp>
#include <QString>
using namespace std;
using namespace cv;
void blending_test()
{
Mat src1, src2, dst;
double alpha = 0.5;
double beta = 1-alpha;
src1 = imread("11.jpg");
src2 = imread("12.jpg");
if(!src1.data) cout<<"error loading src1"<<endl;
if(!src2.data) cout<<"Error loading src2"<<endl;
addWeighted(src1, alpha, src2, beta, 0.0, dst);
imshow("output1", dst);
//  waitKey(0);
}
//C语言自己实现
void blending()
{
Mat src1, src2, dst;
double alpha = 0.5;
double beta = 1-alpha;
double gama = 0;
src1 = imread("11.jpg");
src2 = imread("12.jpg");
//判断两幅图片是否相同
CV_Assert(src1.depth() == CV_8U);
CV_Assert(src1.depth() == src2.depth());
CV_Assert(src1.size() == src2.size());
//为dst申请内存
dst.create(src1.size(), src1.type());
const int nChannels = src1.channels();
if(!src1.data) cout<<"error loading src1"<<endl;
if(!src2.data) cout<<"Error loading src2"<<endl;
for (int i=0; i<src1.rows; i++)
{
const uchar* src1_ptr = src1.ptr<uchar>(i);
const uchar* src2_ptr = src2.ptr<uchar>(i);
uchar* dst_ptr  = dst.ptr<uchar>(i);
for (int j=0; j<src1.cols*nChannels; j++)
{
dst_ptr[j] = src1_ptr[j]*alpha + src2_ptr[j]*beta + gama;
}
}
imshow("output2",dst);
}
//下面是main函数部分
int main(int argc, char* argv[])
{
double t;
t = (double)getTickCount();
blending_test();
t = 1000*((double)getTickCount() - t)/getTickFrequency();
printf("opencv time: %f ms\n",t);
cout<<"opencv time:"<<t<<endl;
t = (double)getTickCount();
blending();
t = 1000*((double)getTickCount() - t)/getTickFrequency();
cout<<"c language time:"<<t<<"ms"<<endl;
cvWaitKey(0);
return 0;
}

imread()需要0.7ms左右
imshow特别需要时间，几百

addWeighted需要时间是2ms，连续三次需要3ms
但是c语言遍历版的需要3ms