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pdvelez / CV-lecture-quizzes-python

Python version of GT/Udacity Introduction to Computer Vision quizzes
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2A-L5 Runtime error with OpenCV 4.0.x #10

Closed dleazer closed 5 years ago

dleazer commented 5 years ago

I'm getting this error when trying to run the solution for gradient_quiz.py:

Traceback (most recent call last): File "CV-lecture-quizzes-python/2A-L5/answers/gradient_quiz.py", line 22, in cv2.imshow('Image', img) # assumes [0, 1] range for double images cv2.error: OpenCV(4.0.0) c:\projects\opencv-python\opencv\modules\imgproc\src\color.hpp:261: error: (-2:Unspecified error) in function '__cdecl cv::CvtHelper<struct cv::Set<1,-1,-1>,struct cv::Set<3,4,-1>,struct cv::Set<0,2,5>,2>::CvtHelper(const class cv::_InputArray &,const class cv::_OutputArray &,int)' > Unsupported depth of input image: > 'VDepth::contains(depth)' > where > 'depth' is 6 (CV_64F)

pdvelez commented 5 years ago

I'm not able to reproduce this error. I ran this script using python 2 & 3 with opencv 4.0.0.21 in macos. Have you modified the paths to be compatible with windows?

If the error is only linked to the array depth type try converting them to uint8 before each imshow call:

img_uint8 = (255 * img).astype("uint8")
cv2.imshow("Image", img_uint8)
cv2.waitKey(0)  # will wait until any key is pressed
dleazer commented 5 years ago

Converting to uint8 was indeed the solution. Thank you for your help.