Stacking images in Python

Question

I have two images img1 and img2 of shape (20,20,3), that I have read using OpenCV.

I have applied the following statement on the two images:

np.stack([img1,img2], axis=2)

and got the following shape:

(20, 20, 2, 3)

Does that mean that we now have 2 20x20x3 images? Are they (images and their channels) like put beside each other?

Thanks.

Community · Accepted Answer · 2020-06-20 09:12:55Z

2

No you have created a new axis, your array now has four dimensions.

numpy.stack(arrays, axis=0)

Join a sequence of arrays along a new axis.

In order to get what you want try numpy.hstack:

a = np.zeros((20, 20, 3))

b = np.ones((20, 20, 3))

c = np.hstack((a, b))

print(c.shape)

(20, 40, 3)

CommunityBot

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answered Feb 10, 2018 at 8:38

tde

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