[学习opencv]图像读取写入，加减乘除

#include "cv.h"
#include "highgui.h"
#include <iostream>

using namespace std;
using namespace cv;

int main(int argc, char* argv[])
{
        Mat img1 = imread("maki.jpg"); 
        Mat img2 = imread("misaka.jpg");

        int height=img1.rows;                //行数
        int width=img1.cols;                   //列数
        int dims=img1.dims;                    //维数
        cout<<height<<"  "<<width<<"  "<<dims<<endl;

        Mat tmp(height,width,CV_8UC3,Scalar(2,2,2));  //产生一个[height width 3]所有元素全为2的矩阵
        Mat re;    
        //运算符重载真是让人喜欢
        re=img1+Scalar(100,100,100);                    //图像相加
        imshow("image1", re);

        re=img1-img2;                      //图像相减
        imshow("image2",re);

        re=img1*2;                      //图像和一个数相乘    
        imshow("image3",re);

        re=img1/2;                    //图像和一个数相除
        imshow("image4",re);

        re=img1.mul(tmp);            //img1和tmp每个元素相乘
        imshow("image5",re);
        Vec3i s=re.at<Vec3b>(1,1);   //数据访问
        cout<<s.val[0]<<"  "<<s.val[1]<<"  "<<s.val[2]<<endl;

        imwrite("re.jpg",re);
        waitKey();

        return 0;
}

" C++的编译和运行
map <F6> :call CompileRunGpp()<CR>
func! CompileRunGpp()
exec "w"
exec "!g++ `pkg-config opencv --libs --cflags opencv` % -g -o %<"
exec "! ./%<"
endfunc