《opencv入门教程》（迭代器遍历）

#include<iostream>
#include<opencv2/opencv.hpp>

using namespace std;
using namespace cv;

int main(){
Mat grayim(600,800,CV_8UC1);
Mat colorim(600, 800, CV_8UC3);

MatIterator_<uchar> graybegin, grayend;
MatIterator_<Vec3b> colorbegin, colorend;

for (graybegin = grayim.begin<uchar>(), grayend = grayim.end<uchar>();
graybegin != grayend; ++graybegin){

*graybegin = rand() % 255;
}

//遍历所有的像素，设置像素值

for (colorbegin = colorim.begin<Vec3b>(), colorend = colorim.end<Vec3b>();
colorbegin != colorend; ++colorbegin){

(*colorbegin)[0] = rand() % 255;
(*colorbegin)[1] = rand() % 255;
(*colorbegin)[2] = rand() % 255;

}

imshow("image1", grayim);
imshow("image2", colorim);
waitKey(0);

}

graybegin = grayim.begin<uchar>(), grayend = grayim.end<uchar>()

<pre name="code" class="cpp">colorbegin = colorim.begin<Vec3b>(), colorend = colorim.end<Vec3b>()