opencv Mat对象

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

using namespace std;
using namespace cv;

int main(int argc, char** argv)
{

    Mat src;

    src = imread("D:/vcprojects/images/test.png");
    if (src.empty()) {
        cout << "could not load image..." << endl;
        return -1;
    }
    namedWindow("input", CV_WINDOW_AUTOSIZE);
    imshow("input", src);

    //Mat dst;
    //dst = Mat(src.size(), src.type());
    //dst = Scalar(127, 0, 255);
    //namedWindow("output", CV_WINDOW_AUTOSIZE);
    //imshow("output", dst);


    //Mat dst = src.clone();
    //namedWindow("output", CV_WINDOW_AUTOSIZE);
    //imshow("output", dst);


    //Mat dst;
    //src.copyTo(dst);
    //namedWindow("output", CV_WINDOW_AUTOSIZE);
    //imshow("output", dst);

    Mat dst;
    cvtColor(src, dst, CV_BGR2GRAY);
    printf("input image channels : %d\n", src.channels());
    printf("output image channels : %d\n", dst.channels());

    int cols = dst.cols;
    int rows = dst.rows;
    printf("rows : %d cols : %d\n", rows, cols);

    const uchar* firstRow = dst.ptr<uchar>(0);
    printf("fist pixel value : %d\n", *firstRow);
    namedWindow("output", CV_WINDOW_AUTOSIZE);
    imshow("output", dst);

    Mat M(100, 100, CV_8UC1, Scalar(127));
    //cout << "M =" << endl << M << endl;
    namedWindow("333", CV_WINDOW_AUTOSIZE);
    imshow("333", M);


    Mat m1;
    m1.create(src.size(), src.type());
    m1 = Scalar(0, 0, 255);
    namedWindow("44", CV_WINDOW_AUTOSIZE);
    imshow("44", m1);


    Mat csrc;
    Mat kernel = (Mat_<char>(3, 3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);
    filter2D(src, csrc, -1, kernel);
    namedWindow("55", CV_WINDOW_AUTOSIZE);
    imshow("55", csrc);



    waitKey(0);
    return 0;
}