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Correction of scanned book images

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3 Author(s)
Aogang, Xi Zhong ; Department of Computer Science and Technology, Tsinghua University, Beijing 100084, China ; Li, Xinyou ; Tang, Zesheng

Because of the spine, a book cannot be set flat on a flat bed scanner. As a result, the image suffers from shape distortion, variable brightness, and blurred characters. This paper describes a method based on book shape analysis to address these problems. The algorithm utilizes the relation between the distance from a line segment on the book to the flat bed and its projected length. The correction process uses edge extraction, iterative boundary point computati ons, linear image transformation, and histogram modification. Experimental resul ts show that the shape distortion and brightness variarce problems are perfectly resolved by the method.

Published in:

Tsinghua Science and Technology  (Volume:8 ,  Issue: 5 )