opencv Mat对象

#include <opencv2/opencv.hpp>

#include <iostream>

using namespace cv;

int main()
{
	Mat src, dst;

	src = imread("E:/image/flower.bmp");

	if (!src.data)
	{
		printf("Could not load image");
		return -1;
	}
	namedWindow("input image", WINDOW_AUTOSIZE);
	imshow("input image", src);

	/*dst = Mat(src.size(), src.type());
	dst = Scalar(255, 0, 0);

	namedWindow("output image", WINDOW_AUTOSIZE);
	imshow("output image", dst);*/

	//dst = src.clone();
	//src.copyTo(dst);

	cvtColor(src, dst, COLOR_BGR2GRAY);
	imwrite("d:/test.bmp", dst);

	printf("input channel:%d\n", src.channels());
	printf("output channel:%d\n", dst.channels());

	int rows = dst.rows;
	int cols = dst.cols;

	printf("rows:%d\n", rows);
	printf("cols:%d\n", cols);

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

	namedWindow("output image", WINDOW_AUTOSIZE);
	imshow("output image", dst);


	waitKey(0);
	return 0;
}