Add option to group scans and export them to PDF

[ghost]

Ability to group some photos in one document would be useful and display them instead of single photos.
Exporting these groups to PDF files also would be convenient for users.

[Gauravv97]

Hi ghost, I was doing a project related to document handling and adding one feature after another lead it to becoming a document scanner. OpenNoteScanner helped me a lot. If you are also creating something similar to OpenNoteScanner and can't find any references you can look at my project. The pdf part was quite tricky but with some trial and error I found a way of implementing it without any third party library (without textfairy etc). In addition to that i looked for some other github projects and added crop funtionality again with some trial and error i kind of perfected it. Scanning part is heavily inspired from here but i modified color scan a little bit . In short I added

• Pdf
• Batch photos
• 4 point crop
• Color scan along with same openNotescanner
• OCR using mobile vision
• some original functionalities of what my project originally meant to do.
  You can see my project for reference.

[rgarrigue]

This feature would be very nice to have 👍