ad-si/Perspec

Automatically extract documents from images and perspectively correct them with classic computer-vision algorithms. In maintenance mode. Check out its successor at:

Clean, deskew, and enhance photographed or scanned PDFs and images into crisp, high-contrast documents locally.

Document image dewarping library using a cubic sheet model

Library used to deskew a scanned document

ScanTailor Advanced is the version that merges the features of the ScanTailor Featured and ScanTailor Enhanced versions, brings new ones and fixes.

Scan Tailor Experimental is an interactive post-processing tool for scanned pages.

A document scanner implemented with opencv.js

Deskew is a command line tool for deskewing scanned text documents. It uses Hough transform to detect "text lines" in the image. As an output, you get an image rotated so that the lines are horizontal.

Online webgl photo editor with effects, filters and cropping