NDLI: Morphological degradation models and their use in document image restoration

Content Provider	IEEE Xplore Digital Library
Author	Qigong Zheng Kanungo, T.
Copyright Year	2001
Description	Author affiliation: Center for Autom. Res., Maryland Univ., College Park, MD, USA (Qigong Zheng)
Abstract	Document images undergo various degradation processes. Numerous models of these degradation processes have been proposed in the literature. In this paper we propose a model-based restoration algorithm. The restoration algorithm first estimates the parameters of a degradation model and then uses the estimated parameters to construct a lookup table for restoring the degraded image. The estimated degradation model is used to estimate the probability of an ideal binary pattern, given the noisy observed pattern. This probability is estimated by degrading noise-free document images and then computing the frequency of corresponding noise-free and noisy pattern pairs. This conditional probability is then used to construct a lookup table to restore noisy images. The impact of the restoration process is then quantified by computing the decrease in OCR word and character error rate. We find that given the estimated degradation model parameter values, the restoration algorithm decreases the character error rate by 16.1% and the word error rate by 7.35%. In some categories of degradation (e.g. model parameters that give rise to broken characters) there is a 41.5% reduction in character error rate and 20.4% reduction in word error rate.
Sponsorship	IEEE Signal Process. Soc
Starting Page	193
Ending Page	196
File Size	330286
Page Count	4
File Format	PDF
ISBN	0780367251
DOI	10.1109/ICIP.2001.958986
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-10-07
Publisher Place	Greece
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Degradation Image restoration Error analysis Nonlinear filters Parameter estimation Integrated circuit modeling Educational institutions Table lookup Frequency estimation Automation
Content Type	Text
Resource Type	Article

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