Does not work with images rotated around 90 degrees

[tytuseczek]

Deskew works great for me for small angles. However, it totally fails for me if images are orientated around 90 degrees.

This is strange, as I have clear horizontal lines through all the documents which should be very easy to detect

I can send example files with private message as this is medical data and I am not at ease to shere it publicly, even after anonymization.

[tytuseczek]

I am using as library using your example code.

[sbrunner]

This took is not relay do to rotate the images 90°, I use tesseract --psm 0 to determine the 90°, 180°, -90° rotation, then in the latest version I do rotation only between -45° and 45°.
I can add an option to allow rotation between -90° and 90° if it can unblock you...

[tytuseczek]

1. It would be nice to write in Readme, that rotation should be between -45° and 45°.
2. I also thought of using tesseract, but this is very slow. Morever, it could not work for rotations like 50°. Option of using agles up to 90° could be useful. Maybe there is a way to return sum kind of "score" which could be comapred between original image or image rotated 90°. In this case it will be possible to manually avoid adding a lot of blank space (we rotate first and then deskew).