Robustness of character recognition techniques to double print-and-scan process
Résumé
The integrity check of printed and scanned documents is a hot topic these days. Several solutions were proposed for documents printed and scanned once. However forged documents quite often pass through a double Print-and-Scan (P&S) process. The P&S process impacts a lot the shape and color of characters. Therefore, the top OCR Engines cannot correctly recognize these characters. In this paper, we present the problems that the Tesseract OCR Engine faces with when trying to recognize the characters printed and scanned twice. We suggest to use the PCA based character recognition method that outperforms the Tesseract OCR in our experiments. We also show that the use of a pre-procesing step can improve the recognition results of double printed and scanned documents. Finally, we discuss the pros and cons of the PCA based recognition method.
Origine | Fichiers produits par l'(les) auteur(s) |
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