cv2.findContours issues, opencv

I am trying to run a code from Kaggle, but i am unable to.

The code is here

The error msg i get is:

--------------------------------------------------------------------------- IndexError                                Traceback (most recent call last) <ipython-input-6-2a3e36c2605f> in <module>()      59         _, contours_mask, _ = cv2.findContours(thresh_mask.copy(),cv2.RETR_TREE,cv2.CHAIN_APPROX_NONE)      60  ---> 61         main_contour = sorted(contours_mask, key = cv2.contourArea, reverse = True)[0]      62       63         x,y,w,h = cv2.boundingRect(main_contour)  IndexError: list index out of range 

It might be python or package version related, as other ppl havent experienced the code.

I tried openning some outputs but I am new to cv2.

To my understanding:

cv2.findContours() -> image, contours, hierarchy 

What i do get:

cv2.findContours(thresh_mask.copy(),cv2.RETR_TREE,cv2.CHAIN_APPROX_NONE) -> (array([[0, 0, 0, ..., 0, 0, 0],     [0, 0, 0, ..., 0, 0, 0],     [0, 0, 0, ..., 0, 0, 0],     ...,      [0, 0, 0, ..., 0, 0, 0],     [0, 0, 0, ..., 0, 0, 0],     [0, 0, 0, ..., 0, 0, 0]], dtype=uint8), [], None) 

Hence, countours is empty, which might be the problem. thresh_mask is an all zero matrix for that case, which might be the cause. unsure of it though.

Any hints/advices?

Thx

1 Answers

Answers 1

It happens because your input image (thresh_mask) is empty i.e complete black. No contours are detected. Please check contents of thresh_mask or display it using cv2.imshow.

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