opencv在一个窗口里面显示多张图片

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);
}

void main()
{
Mat img01 = imread("01.png");
Mat img02 = imread("02.png");
Mat img03 = imread("03.png");
vector<Mat> imgs;
imgs.push_back(img01);
imgs.push_back(img02);
imgs.push_back(img03);
imshowMany("Show", imgs);
}