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This paper describes the image enhancement techniques that we have used to help historians read three kinds of writing tablets: ink, wooden stilus and lead curse tablet. The techniques include: homomorphic filtering to correct uneven illumination, high-pass filtering to remove shading caused by surface undulations, and a newer technique to remove the often substantial complicating factor of wood grain. A phase-based feature detector has been developed to detect text stroke. A description of the detected strokes is generated for a text recognition system. © 2004 Elsevier B.V. All rights reserved.

Original publication




Journal article


Image and Vision Computing

Publication Date





443 - 451