Error: Need more than 2 values to unpack

[stevethearkiv]

Sorry I cannot get this to work, and there is nothing in the readme about additional values?

Cheers for any help you can give me

loaded boston_cooking_a.jpg with size 2448x3264 and resized to 490x653
Traceback (most recent call last):
File "../page_dewarp.py", line 915, in
main()
File "../page_dewarp.py", line 867, in main
cinfo_list = get_contours(name, small, pagemask, 'text')
File "../page_dewarp.py", line 450, in get_contours
cv2.CHAIN_APPROX_NONE)
ValueError: need more than 2 values to unpack

[Andry-Bal]

In earlier versions of openCV function findContours() used to return 3 values (image, contours, hierarchy). In openCV 4 it returns two values (contours, hierarchy) and this is what causing the error. Just use openCV 3.

[bjornmosten]

You can also just remove the first _ on line 450, making the line

contours, _ = cv2.findContours(mask, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)