Small image deformations such as those introduced by optical scanners significantly reduce the accuracy rate of optical character recognition (OCR) software. Characterization of the scanner used in the OCR process may diminish the impact on recognition rates. Theoretical methods have been developed to characterize a scanner based on the bi-level image resulting from scanning a high contrast document. Two bottlenecks in the naïve implementation of these algorithms have been identified, and techniques were developed to improve the execution time of the software. The algorithms are described and analyzed. Since approximations are used in one of the techniques, the error of the approximations is examined.
Clements, Roger D. and Barney Smith, Elisa H.. (2003). "Speedup of Optical Scanner Characterization Subsystem". Proceedings of SPIE, 5010. http://dx.doi.org/10.1117/12.476060