Dr. Prateek Sarkar Profile

Dr. Prateek Sarkar

at PARC, part of SRI International

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Proceedings Article | 18 December 2001 Paper

Triage of OCR results using confidence scores

Prateek Sarkar, Henry Baird, John Henderson

Proceedings Volume 4670, (2001) https://doi.org/10.1117/12.450730

KEYWORDS: Optical character recognition, Systems modeling, Classification systems, Data modeling, Reliability, Inspection

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We describe a technique for modeling the character recognition accuracy of an OCR system -- treated as a black box -- on a particular page of printed text based on an examination only of the output top-choice character classifications and, for each, a confidence score such as is supplied by many commercial OCR systems. Latent conditional independence (LCI) models perform better on this task, in our experience, than naive uniform thresholding methods. Given a sufficiently large and representative dataset of OCR (errorful) output and manually proofed (correct) text, we can automatically infer LCI models that exhibit a useful degree of reliability. A collaboration between a PARC research group and a Xerox legacy conversion service bureau has demonstrated that such models can significantly improve the productivity of human proofing staff by triaging -- that is, selecting to bypass manual inspection -- pages whose estimated OCR accuracy exceeds a threshold chosen to ensure that a customer-specified per-page accuracy target will be met with sufficient confidence. We report experimental results on over 1400 pages. Our triage software tools are running in production and will be applied to more than 5 million pages of multi-lingual text.

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