Opencv图像识别从零到精通（11）---一个窗口多图显示

前面介绍了如何批量的读取图片，从而也会有批量的显示一堆图片，那么在平时我们显示图片的时候，会发现都是一个图片一个窗口，会出来很多，这时候就会想到matlab中我们经常会使用subplot显示多张图片在一个窗口，之前http://blog.csdn.net/qq_20823641/article/details/51910066这篇文章也提供了一种方法，可以参考一下，经过进一步学习，从简单到复杂，再一次认为subplot（），感觉越来越有意思，虽然不是最好的，但是是入门比较好的，其中很多部分都可以进行优化，以后会在精通部分进行展示，这里已入门为主。

一、版本1

<span style="font-size:18px;">int main(void)
{
	vector<Mat> imgs(2);
	imgs[0] = imread("cm.png");
	imgs[1] = imread("cm.png");
	Mat dispImg;
	int x, y;
	x = imgs[0].cols;
    y = imgs[0].rows;
	int max;
	max = (x > y)? x: y;
	int dstsize=max;
	dispImg.create(Size(dstsize*(1+1)+100,dstsize), CV_8UC3);
	int nImg = (int)imgs.size();
	for(int i=0;i<nImg;i++)
	{

	    int m=20+i*max;
	    int n=20;
        Mat imgROI = dispImg(Rect(m, n, (int)x, (int)y));
	    resize(imgs[i], imgROI, Size((int)x, (int)y));

	}
      namedWindow("winName");
      imshow("winName", dispImg);
      waitKey();
      return 0;
}</span>

二、版本2

<span style="font-size:18px;">int main(void)
{
	vector<Mat> imgs(6);
	imgs[0] = imread("cm.png");
	imgs[1] = imread("cm.png");
	imgs[2] = imread("lina.png");
	imgs[3] = imread("dr.png");
	imgs[4] = imread("pom.png");
	imgs[5] = imread("qop.png");

	imshowMany("DOTA2_Hero", imgs);
	waitKey();
	return 0;
}

void imshowMany(const std::string& _winName, const vector<Mat>& _imgs)
{
	int nImg = (int)_imgs.size();

	Mat dispImg;

	int size;
	int x, y;

	// w - Maximum number of images in a row
	// h - Maximum number of images in a column
	int w, h;
	// scale - How much we have to resize the image
	float scale;
	int max;

	if (nImg <= 0)
	{
		printf("Number of arguments too small....\n");
		return;
	}
	else if (nImg > 12)
	{
		printf("Number of arguments too large....\n");
		return;
	}

	else if (nImg == 1)
	{
		w = h = 1;
		size = 300;
	}
	else if (nImg == 2)
	{
		w = 2; h = 1;
		size = 300;
	}
	else if (nImg == 3 || nImg == 4)
	{
		w = 2; h = 2;
		size = 300;
	}
	else if (nImg == 5 || nImg == 6)
	{
		w = 3; h = 2;
		size = 200;
	}
	else if (nImg == 7 || nImg == 8)
	{
		w = 4; h = 2;
		size = 200;
	}
	else
	{
		w = 4; h = 3;
		size = 150;
	}

	dispImg.create(Size(100 + size*w, 60 + size*h), CV_8UC3);

	for (int i= 0, m=20, n=20; i<nImg; i++, m+=(20+size))
	{
		x = _imgs[i].cols;
		y = _imgs[i].rows;

		max = (x > y)? x: y;
		scale = (float) ( (float) max / size );

		if (i%w==0 && m!=20)
		{
			m = 20;
			n += 20+size;
		}

		Mat imgROI = dispImg(Rect(m, n, (int)(x/scale), (int)(y/scale)));
		resize(_imgs[i], imgROI, Size((int)(x/scale), (int)(y/scale)));
	}

	namedWindow(_winName);
	imshow(_winName, dispImg);
}</span>

http://blog.csdn.net/yang_xian521/article/details/7915396

http://kanwoerzi.iteye.com/blog/1304073

三、Matlab辅助

matlab就一个subplot()就搞定了，参考这个最后给出了matlab的代码和图片http://blog.csdn.net/qq_20823641/article/details/51910066