Image enhancement
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Image enhancement toolsThis 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.
Publications
- IMPACT deliverable IMPACT D-TR1 Image Enhancement Toolkit.pdf (December 2011)
- Stamatopoulos, N., B. Gatos, I. Pratikakis and S.J.Perantonis, “Goal-oriented Rectification of Camera-Based Document Images”. IEEE Transactions on Image Processing, DOI: 10.1109/TIP.2010.2080280
- BL Demo Day – July2011 – (3) Image Enhancement for OCR