What is the reason for this error? (-215:Assertion failed) !_src.empty() in function ‘cvtColor’ [duplicate]

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What is the reason for this error? (-215:Assertion failed) !_src.empty() in function ‘cvtColor’

  1. How to solve What is the reason for this error? (-215:Assertion failed) !_src.empty() in function 'cvtColor' [duplicate]

    You get the error when you are attempting to use the cv2.cvtColor() method on an empty image. Observe:
    >>> import cv2 >>> import numpy as np >>> img = np.uint8([]) >>> img array([], dtype=uint8) >>> cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) Traceback (most recent call last): File "<stdin>", line 1, in <module> cv2.error: OpenCV(4.5.1) /tmp/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor' >>>
    The likely cause of empty images in your code is that you used the cv2.imread() method on a path that doesn't exist. Make sure that your paths are correctly defined, and one way to do this is to use the os.path.exists() method:
    >>> import os >>> path = "Folder/images/1.png" >>> if os.path.exists(path): ... img = cv2.imread(path) ... else: ... print("Path does not exist:", path) ... >>>

  2. What is the reason for this error? (-215:Assertion failed) !_src.empty() in function 'cvtColor' [duplicate]

    You get the error when you are attempting to use the cv2.cvtColor() method on an empty image. Observe:
    >>> import cv2 >>> import numpy as np >>> img = np.uint8([]) >>> img array([], dtype=uint8) >>> cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) Traceback (most recent call last): File "<stdin>", line 1, in <module> cv2.error: OpenCV(4.5.1) /tmp/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor' >>>
    The likely cause of empty images in your code is that you used the cv2.imread() method on a path that doesn't exist. Make sure that your paths are correctly defined, and one way to do this is to use the os.path.exists() method:
    >>> import os >>> path = "Folder/images/1.png" >>> if os.path.exists(path): ... img = cv2.imread(path) ... else: ... print("Path does not exist:", path) ... >>>

Solution 1

You get the error when you are attempting to use the cv2.cvtColor() method on an empty image. Observe:

>>> import cv2
>>> import numpy as np
>>> img = np.uint8([])
>>> img
array([], dtype=uint8)
>>> cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
cv2.error: OpenCV(4.5.1) /tmp/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

>>> 

The likely cause of empty images in your code is that you used the cv2.imread() method on a path that doesn’t exist. Make sure that your paths are correctly defined, and one way to do this is to use the os.path.exists() method:

>>> import os
>>> path = "Folder/images/1.png"
>>> if os.path.exists(path):
...     img = cv2.imread(path)
... else:
...     print("Path does not exist:", path)
... 
>>> 

Original Author Ann Zen Of This Content

Solution 2

  • This error occurs when function works on a null input, probably because the input wasn’t inputted properly. Try printing the image and check if it is not a null value.
  • In the load data function where you are calling the crop_brain_contour function make sure you are passing the directory of the image correctly.
  • Try modifying your code to even include the extension of the image and make sure to enter the correct directory. Try changing your code to:
    image = cv2.imread(directory + '/' + filename + 'extension_of_the_image')

Original Author Karthik Sanka Of This Content

Conclusion

So This is all About This Tutorial. Hope This Tutorial Helped You. Thank You.

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I am an Information Technology Engineer. I have Completed my MCA And I have 4 Year Plus Experience, I am a web developer with knowledge of multiple back-end platforms Like PHP, Node.js, Python and frontend JavaScript frameworks Like Angular, React, and Vue.

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