[Feature][Core] Auto Rotating the OMR sheet

[Udayraj123]

We want to be able to identify and correct rotation of input images

Some ideas

1. Firstly, we can take expected page orientation(portrait/landscape) from user.
2. For a start, check for height-width ratio and always rotate clockwise (ignore wrongly rotated images, will be separated later).
3. Try both clockwise and anti-clockwise corrections and the one with the "more correct" histogram will be considered.

Acceptance criterion:

1. The code should run for rotated versions of all sample images in the repo.
2. Proper logging of rotations should be done to make debugging easier

Example real user validation: https://discord.com/channels/590134763784896514/590134763784896520/908620446201696316

Note: this issue is marked with the hacktoberfest label. Follow #hacktoberfest-discussions on Discord for further details .

[aksha123-git]

I would like to work on this issues please assign it to me

[Udayraj123]

Hi @aksha123-git , no problem! please go through the code once and discuss an approach for this on discord. Once we have a clarity on how to move forward I'll assign it to you. fyi there is one more person who has approached me to work on this. So better to start a discussion soon.

[Udayraj123]

@aksha123-git let me know if there are any updates or any help needed :)

[Gauravmauryaios]

Please assign this issue to me

[Udayraj123]

@Gauravmauryaios you can discuss your approach with me on discord before getting assigned :)

[Udayraj123]

Pasting approaches from the code comment here:

        """
        TODO later Autorotate:
            - Rotate 90 : check page width:height, CW/ACW?
                - do CW, then pass to 180 check.
            - Rotate 180 :
                - check markers centroid (OMR specific, paper warping may be imperfect.)
                - OCR check
            - Check column fields like roll field after morphing should be 'vertical' (based on col_orient)
        """

[Gauravmauryaios]

@Udayraj123 sure

[Udayraj123]

Adding an approach for OMR sheets containing a "direction indicator" marker -

We can create a pre-processor that auto-rotates the image based on the presence of a marker in a given position (it will hit and try the rotations in the order - top, bottom, left, right ref: https://products.aspose.app/omr/create-answer-sheet

[Udayraj123]

Changing difficulty from Medium to Hard considering the scope of the problem is now more generic and an abstract solution is possible from the current dev branch.