Image thresholding of historical documents using entropy and ROC curves

Authors:
Carlos A. B. Mello;Antonio H. M. Costa
Affiliations:
Department of Computing Systems, Polytechnic School of Pernambuco, Madalena, Recife, PE, Brazil;Department of Computing Systems, Polytechnic School of Pernambuco, Madalena, Recife, PE, Brazil
Venue:
CIARP'05 Proceedings of the 10th Iberoamerican Congress conference on Progress in Pattern Recognition, Image Analysis and Applications
Year:
2005

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Abstract

It is presented herein a new thresholding algorithm for images of historical documents. The algorithm provides high quality binary images using entropy information of the images to define a primary threshold value which is adjusted with the use of ROC curves.