Error on sample data. ValueError: not enough values to unpack (expected 3, got 2)

[chanjuping]

On an Ubuntu 20.04 fresh virtual machine setup with 4 GB RAM and 6 Cores, I ran through a the setup process, and also installed python3-scipy as a dependency.

Running ./main.py examples/sample_page.jpg, I got:

Analyzing image=examples/sample_page.jpg...
Saving results to results_sample_page
Traceback (most recent call last):
File "./main.py", line 228, in
sections = analyse_image(img, verbose=verbose, dirname=dirname)
File "./main.py", line 166, in analyse_image
sections = find_sections(img, verbose=verbose, dirname=dirname)
File "./main.py", line 81, in find_sections
ctrs = find_contours_text(img, size, verbose=verbose, sort_key=sort_key)
File "./main.py", line 36, in find_contours_text
_, ctrs, _ = cv2.findContours(dilation.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
ValueError: not enough values to unpack (expected 3, got 2)

I initially found this error in my Opensuse Tumbleweed host machine as well.

Analyzing image=examples/sample_page.jpg...
Saving results to results_sample_page
Traceback (most recent call last):
File "./main.py", line 228, in
sections = analyse_image(img, verbose=verbose, dirname=dirname)
File "./main.py", line 166, in analyse_image
sections = find_sections(img, verbose=verbose, dirname=dirname)
File "./main.py", line 81, in find_sections
ctrs = find_contours_text(img, size, verbose=verbose, sort_key=sort_key)
File "./main.py", line 36, in find_contours_text
_, ctrs, _ = cv2.findContours(dilation.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
ValueError: not enough values to unpack (expected 3, got 2)

[Piturnah]

I am having this same issue on Windows 10

[Ghost99]

This is because of this particular commit: bfa3ee7
Just remove first argument in

python-japanese-ocr/main.py

Line 36 in bfa3ee7

_, ctrs, _ = cv2.findContours(dilation.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

and it will work