The algorithm is able to extract the ROIs of the custom sheets

[ramezmosad]

Fixes #104

What was changed?

• Introduced two new classes, SheetProcessor and CustomProcessor, to handle the extraction of Regions of Interest (ROIs) from custom answer sheets.
• Created the SheetProcessor abstract class to provide a base structure for sheet processing, which can be extended to support various sheet types.
• Implemented CustomProcessor, a subclass of SheetProcessor, specifically for extracting ROIs of custom answer sheets.
• Modified Scantron95945 so it inherits SheetProcessor.
• Set up a new folder structure within data/:
  • data/customAligned for storing aligned images extracted from the custom PDF sheets.
  • data/customROIs for saving the ROIs of each custom sheet image in separate subfolders, ensuring that multi-page documents are handled correctly.

Why was it changed? This change addresses the need to properly extract ROIs for each page of custom answer sheets in a structure similar to that used for Scantron sheets.

How was it changed?

1. New SheetProcessor Abstract Class:

• Created SheetProcessor as an abstract base class, defining a standard interface for sheet processing. This class can be extended by other sheet processing types, including CustomProcessor and Scantron95945.
• Added reusable methods, like extractImagesFromPdf, extractROIs that allow subclasses to handle PDF image extraction without code duplication.

2. New CustomProcessor Class:

• Implemented CustomProcessor to handle the specific layout and structure of the custom answer sheets.
• Defined methods extractROIs and crop_roi in CustomProcessor to:
  • Extract images from each page of the custom sheet PDF.
  • Crop ROIs for each page in a structured way, saving them in a dedicated folder under customROIs.
• Organized the ROIs by creating subfolders for each image within customROIs.

3. New Folder Structure for Custom Sheets:
   • Added customAligned and customROIs folders to data/ to separate custom sheet data from Scantron data. This keeps custom sheet processing independent, organized, and easy to manage.

Screenshots that show the changes (if applicable):

[ramezmosad]

@Chirag2x Yes, I feel like it would be easier to have two separate files for handling the two different sheet types. And yeah different functions would be called based one whichever sheet type the user chooses. Do you think having it all in one file would be easier? I was just unsure about how I would go about that. There's the option of just implementing the methods that are in Custom.py inside Scantron.py. For example, inside Scantron.py I would add an "extractCustomROIs" method and that would just be the "extractROIs" method that's defined in Custom.py. I'm not sure which way makes more sense so if you have any recommendations please let me know!

[Chirag2x]

Well, Both of them are right approach. Let go ahead with the method you pushed. I am approving the merge.