C++ 如何使用 imshow 在多个窗口中显示多个图像？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/17987598/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How can I use imshow to display multiple images in multiple windows?
提问by prgbenz
I would like to do something like the following in order to display two images on the screen:
我想执行以下操作，以便在屏幕上显示两个图像：
imshow("1", img1);
imshow('2', 'img2');
Is it possible to do that?
有可能这样做吗？
Thanks!
谢谢！
回答by Saikat
Yes, it is possible. The function void imshow(const string& winname, InputArray mat)displays an image in the specified window, where -
对的，这是可能的。该函数void imshow(const string& winname, InputArray mat)在指定窗口中显示图像，其中 -
- winname – Name of the window.
- image – Image to be shown.
- winname – 窗口的名称。
- image – 要显示的图像。
The window is identified by its name. So to display two images(img1, img2), in two different window; use imshowwith different name like :-
该窗口由其名称标识。所以要在两个不同的窗口中显示两个图像（img1，img2）；使用imshow不同的名称，如：-
imshow("1",img1);
imshow("2",img2);
回答by bugmenot123
And here is how to do it in Python:
下面是如何在 Python 中做到这一点：
cv2.namedWindow("Channels")
cv2.imshow("Channels", image_channels)
cv2.namedWindow("Main")
cv2.imshow("Main", image_main)
You simply create a named window and pass its name as string to imshow.
您只需创建一个命名窗口并将其名称作为字符串传递给 imshow。
回答by Gord Wait
I have this working in Python, with a caveat:
我有这个在 Python 中工作，有一个警告：
cv2.imshow("image 1", my_image_1)
cv2.imshow("image 2", my_image_2)
cv2.waitKey(0)
The caveat is that both windows are in the exact same spot on the screen, so it only lookslike one window opened up (Ubuntu 14.4). I can mouse drag one to the side of the other.
需要注意的是，两个窗口都在屏幕上完全相同的位置，因此看起来只打开了一个窗口（Ubuntu 14.4）。我可以用鼠标将一个拖到另一个的一侧。
I'm now looking for how to place the two side by side automagically, which is how I found this question..
我现在正在寻找如何自动将两者并排放置，这就是我发现这个问题的方式..
回答by Ahmad Moussa
I ran into the problem of having to create an arbitrary number of openCV windows. I had them stored in a list and couldn't simply loop over it to display them:
我遇到了必须创建任意数量的 openCV 窗口的问题。我将它们存储在一个列表中，不能简单地循环显示它们：
# images is a list of openCV image object
for img in images:
cv2.imshow('image',i)
This doesn't work for the trivial reason of images requiring a different label, hence this loop would only display the last item in the list.
这对于需要不同标签的图像的微不足道的原因不起作用，因此此循环只会显示列表中的最后一项。
That can be solved by using an iterator and python string formatters:
这可以通过使用迭代器和 python 字符串格式化程序来解决：
for i, img in enumerator(images):
cv2.imshow("Image number {}".format(i), img)
Therefore now all images will be displayed since they have been assigned a different label.
因此，现在将显示所有图像，因为它们已被分配了不同的标签。
回答by Waqar Arshad
If your images are in numpy arrays, you could use numpy.hstack function which merges two arrays into a single and use the cv2.imshow() to display the array.
如果您的图像在 numpy 数组中，您可以使用 numpy.hstack 函数将两个数组合并为一个，并使用 cv2.imshow() 来显示数组。
https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.hstack.html
https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.hstack.html
