OpenCV学习：Mat矩阵合并两张图像

#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"

using namespace cv;

int main(int argc, char **argv)
{
Mat img_left = imread("church01.jpg");
Mat img_right = imread("church02.jpg");

Size size(img_left.cols + img_right.cols, MAX(img_left.rows, img_right.rows));

Mat img_merge;
Mat outImg_left, outImg_right;

img_merge.create(size, CV_MAKETYPE(img_left.depth(), 3));
img_merge = Scalar::all(0);
outImg_left = img_merge(Rect(0, 0, img_left.cols, img_left.rows));
outImg_right = img_merge(Rect(img_left.cols, 0, img_right.cols, img_right.rows));

if(img_left.type() == CV_8U)
{
cvtColor(img_left, outImg_left, CV_GRAY2BGR);
}
else
{
img_left.copyTo(outImg_left);
}

if(img_right.type() == CV_8U)
{
cvtColor(img_right, outImg_right, CV_GRAY2BGR);
}
else
{
img_right.copyTo(outImg_right);
}

imshow("merge", img_merge);
imwrite("merge.jpg", img_merge);

waitKey(0);
return 0;
}