Image is not displaying in Google Colab while using imshow()

2019-03-22 04:19:52 opencv matplotlib show google-colaboratory imshow 6 回复 5

I am working on a project which requires functions from OpenCV to plot images. I am trying to display image using the below code in Google Colab. But nothing shows up in the output. Can anybody help me with this?

%pylab notebook
import cv2

testim = imread('butterfly.jpg')
figure()
imshow(testim)
plt.show()

Screenshot:

Link to my Colab Notebook

6个回答

最佳答案

Google colab crashes if you try to display image using cv2.imshow() instead import from google.colab.patches import cv2_imshow() and display using cv2_imshow()

参考答案2

Found one workaround. We can use %matplotlib inline in the code to use imshow. Used as example here in In[28] - link

参考答案3

imshow requires an X server, which isn't available in a web browser.

Instead, use the IPython.display.Image library. Here's an example: https://colab.research.google.com/drive/1jWHKR6rhhyZtUulttBD6Pxd_AJhgtVaV

参考答案4

The cv2.imshow() and cv.imshow() functions from the opencv-python package are incompatible with Jupyter notebook; see https://github.com/jupyter/notebook/issues/3935.

As a replacement, you can use the following function:

from google.colab.patches import cv2_imshow

For example, here we download and display a PNG image of the Colab logo:

!curl -o logo.png https://colab.research.google.com/img/colab_favicon_256px.png
import cv2
img = cv2.imread('logo.png', cv2.IMREAD_UNCHANGED)
cv2_imshow(img)

Credits: Code Snippets in Google Colab

参考答案5

Instead of using cv2.imshow() try this:

Change the import to from google.colab.patches import cv2_imshow
Replace cv2.imshow() to cv2_imshow()

I tried it and it worked for me.

参考答案6

while in colab I run a script containing cv2_imshow(image) it returns

Traceback (most recent call last):
  File "detect_faces.py", line 63, in <module>
    cv2_imshow(image)
  File "/usr/local/lib/python3.6/dist-packages/google/colab/patches/__init__.py", line 29, in cv2_imshow
    display.display(PIL.Image.fromarray(a))
AttributeError: module 'PIL' has no attribute 'Image'

why this isn't working?

edit: i just had to add

From PIL import Image

to the script. The cell run works but returns

<PIL.Image.Image image mode=RGB size=500x499 at 0x7FF595F2C320>

and no image. is there an inline for this?