python-opencv-crop

Using OpenCV 3.3 and Python 3 to automatically crop sheets inside images for later archiving them inside a PDF.

Getting started

• Clone repository
• Create virtual environment virtualenv -p /usr/local/bin/python3 venv
• Source virtual environment source venv/bin/activate
• Install requirements pip install -r requirements.txt
• Run script ./crop.py

Readings

Inspired from

• http://www.pyimagesearch.com/2014/09/01/build-kick-ass-mobile-document-scanner-just-5-minutes/
• http://www.pyimagesearch.com/2014/08/25/4-point-opencv-getperspective-transform-example/
• https://stackoverflow.com/questions/36982736/how-to-crop-biggest-rectangle-out-of-an-image/36988763
• https://stackoverflow.com/questions/37803903/opencv-and-python-for-auto-cropping
• https://stackoverflow.com/questions/13538748/crop-black-edges-with-opencv
• http://www.pyimagesearch.com/2016/11/07/intersection-over-union-iou-for-object-detection/
• http://www.pyimagesearch.com/2014/01/20/basic-image-manipulations-in-python-and-opencv-resizing-scaling-rotating-and-cropping/
• https://awesomelemon.github.io/2017/01/15/Document-recognition-with-Python-OpenCV-and-Tesseract.html
• https://stackoverflow.com/questions/6555629/algorithm-to-detect-corners-of-paper-sheet-in-photo
• https://github.com/vipul-sharma20/document-scanner
• http://bretahajek.com/2017/01/scanning-documents-photos-opencv/

Rotation

• https://stuporglue.org/automatically-orient-scanned-photos-correctly-with-opencv/
• http://www.pyimagesearch.com/2017/02/20/text-skew-correction-opencv-python/

Learning

• http://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_tutorials.html
• http://www.pyimagesearch.com/
• http://docs.opencv.org/3.3.0/