Reading and displaying multiple images in opencv

Question

I'm using this code with python and opencv for displaying about 100 images. But imshow function throws an error.

Here is my code:

    nn=[]
    for j in range (187) :
        nn.append(j+63)


    images =[]
    for i in nn:
        path = "02291G0AR\\"
        n1=cv2.imread(path +"Bi000{}".format(i))
        images.append(n1)

    cv2.imshow(images)

And here is the error:

    imshow() missing required argument 'mat' (pos 2)

Answer 1

1. You have to visualize one image at a time, while you are passing images which is a list
2. cv2.imshow() takes as first argument the name of the window

So you should iterate on your loaded images like:

for image in images:
    cv2.imshow('Image', image)
    cv2.waitKey(0)  # Wait for user interaction

---

You may want to take a look to the python opencv documentation about displaying images here .

Answer 2

You can use the following snippet to montage more than one image:

from imutils import build_montages
im_shape = (129,196)
montage_shape = (7,3)
montages = build_montages(images, im_shape, montage_shape)

im_shape : A tuple containing the width and height of each image in the montage. Here we indicate that all images in the montage will be resized to 129 x 196. Resizing every image in the montage to a fixed size is a requirement so we can properly allocate memory in the resulting NumPy array. Note: Empty space in the montage will be filled with black pixels.

montage_shape : A second tuple, this one specifying the number of columns and rows in the montage. Here we indicate that our montage will have 7 columns (7 images wide) and 3 rows (3 images tall).