Image enhancement

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Image enhancement tools

This is a set of software tools for manipulating scanned images in order to improve the recognition results of OCR engines.

The various defects that can manifest themselves in document images are grouped into three broad categories of conditions that can be improved or eliminated in order to enhance the results obtained from scanned documents:

  • Binarisation and Colour Reduction
  • Border Detection and Removal
  • Geometric Correction: Page Curl & Arbitrary Warping

Example Tool

NCSR Geometric Correction: Page Curl

This tool rectifies document images which suffer from warping and perspective distortions.

Produced by: National Center for Scientific Research (NCSR) “Demokritos”