OpenCV计算机编程攻略-Cv::Mat

#include <iostream>
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"

using namespace std;
using namespace cv;

Mat function()
{
Mat ima(500, 500, CV_8U, 50);
return ima;
}

int main(int argc, char* argv[])
{
Mat image1(240, 320, CV_8U, 100);

Mat grayim(600, 800, CV_8UC1);
Mat colorim(600, 800, CV_8UC3);
Mat randim(600, 800, CV_8UC3);

for (int i = 0; i < grayim.rows; i++)
{
for (int j = 0; j < grayim.cols; j++)
{
grayim.at<uchar>(i, j) = (i + j) % 255;
}
}

for (int i = 0; i < colorim.rows; i++)
{
for (int j = 0; j < colorim.cols; j++)
{
Vec3b pixel;
pixel[0] = i % 255;
pixel[1] = j % 255;
pixel[2] = 0;
colorim.at<Vec3b>(i, j) = pixel;
}
}

for (auto imItor = randim.begin<Vec3b>(); imItor != randim.end<Vec3b>(); imItor++)
{
(*imItor)[0] = rand() % 255;
(*imItor)[1] = rand() % 255;
(*imItor)[2] = rand() % 255;
}

imshow("grayim", grayim);
imshow("colorim", colorim);
imshow("randim", randim);

waitKey(0);

return 0;
}