Boost OCR accuracy using iVector based system combination approach

Xujun Peng; Huaigu Cao; Prem Natarajan

doi:10.1117/12.2076241

8 February 2015 Boost OCR accuracy using iVector based system combination approach

Xujun Peng, Huaigu Cao, Prem Natarajan

Proceedings Volume 9402, Document Recognition and Retrieval XXII; 94020E (2015) https://doi.org/10.1117/12.2076241
Event: SPIE/IS&T Electronic Imaging, 2015, San Francisco, California, United States

Abstract

Optical character recognition (OCR) is a challenging task because most existing preprocessing approaches are sensitive to writing style, writing material, noises and image resolution. Thus, a single recognition system cannot address all factors of real document images. In this paper, we describe an approach to combine diverse recognition systems by using iVector based features, which is a newly developed method in the field of speaker verification. Prior to system combination, document images are preprocessed and text line images are extracted with different approaches for each system, where iVector is transformed from a high-dimensional supervector of each text line and is used to predict the accuracy of OCR. We merge hypotheses from multiple recognition systems according to the overlap ratio and the predicted OCR score of text line images. We present evaluation results on an Arabic document database where the proposed method is compared against the single best OCR system using word error rate (WER) metric.

Citation Download Citation

Xujun Peng, Huaigu Cao, and Prem Natarajan "Boost OCR accuracy using iVector based system combination approach", Proc. SPIE 9402, Document Recognition and Retrieval XXII, 94020E (8 February 2015); https://doi.org/10.1117/12.2076241

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