 Python Import error Opencv NameError: name highgui is not defined
By : Nik P
Date : March 29 2020, 07:55 AM
will help you there is no highgui module in opencv's python api. (full-stop) actually , all your import statements look dorky. code :
import cv2
cv2.imshow()
cv2.waitKey()
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Python OpenCV import error with python 3.5
By : Tianjie Zhong
Date : March 29 2020, 07:55 AM
To fix this issue Found an answer - follow the instructions on this website BUT you have to change to the version of python you are using. Also, I didn't bother with the virtual environments.
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 cv2.error: C:\projects\opencv-python\opencv\modules\highgui\src\window.cpp:325: error: (-215) size.width>0 &&
By : Анкестор Мартанкус
Date : March 29 2020, 07:55 AM
hope this fix your issue This error comes up when no image (the array containing the image information) reaches the imshow() function. This is caused because your imread() function is not returning the desired output. Common mistakes include the following:
Incorrect Image Name: Check the name of the image right down to the format. Even jpg and jpeg are different. Incorrect Path: In the case that your image is not in the same directory, put the full path to the image. Since you're using Windows, don't forget to change the backslash to forward. Those using Ubuntu should ensure that they put a '\' before home eg '\home\username\Desktop' Access Issues: This is more prevalent for linux users but sometime you might not have read access to the image. Try using chmod 777 and run your code again. Please note that it is advised to change the access back to something more restrictive.
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Python-opencv Error import cv2 ImportError: dlopen after update of OS X El Capitan
By : Susheel Sriram
Date : March 29 2020, 07:55 AM
wish helps you This is because of SIP (System Integrity Protection) introduced in El Capitan link. I too faced the same issue and came across this SO link. Basically, the relative path dependencies listed in the shared libs need to be changed to absolute paths. There are huge number of these to be corrected in opencv libraries. You can optionally disable SIP. I preferred to change the links instead and wrote the following python snippet.
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Getting an error OpenCV(3.4.1) C:\projects\opencv-python\opencv\modules\imgproc\src\thresh.cpp:1406: error: (-215)
By : RaviKrishna Rayudu
Date : March 29 2020, 07:55 AM
Hope this helps You will be able to resolve your error with following way. First check whether your input image has only single channel. You can check it by running print img.shape. If the result is like (height, width, 3), then the image is not single channel. You can convert the image into a single channel one by: code :
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
img = img.astype('uint8')
ret3,th3 = cv2.threshold(blur,0,255,cv2.THRESH_BINARY | cv2.THRESH_OTSU)
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
img = img.astype('uint8')
blur = cv2.GaussianBlur(img,(5,5),0)
ret3,th3 = cv2.threshold(blur,0,255,cv2.THRESH_BINARY | cv2.THRESH_OTSU)
image = numpy.invert(th3)
cv2.show('image_out', image)
cv2.waitKey(0)
cv2.destroyAllWindows()
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code :
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