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A survey of methods and strategies in character segmentation (1996)
| Venue: | IEEE TRANSACTION ON PAMI |
| Citations: | 211 - 1 self |
BibTeX
@ARTICLE{Casey96asurvey,
author = {Richard G. Casey and Eric Lecolinet},
title = { A survey of methods and strategies in character segmentation},
journal = {IEEE TRANSACTION ON PAMI},
year = {1996},
pages = {690--706}
}
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Abstract
Character segmentation has long been a critical area of the OCR process. The higher recognition rates for isolated characters vs. those obtained for words and connected character strings well illustrate this fact. A good part of recent progress in reading unconstrained printed and written text may be ascribed to more insightful handling of segmentation. This paper provides a review of these advances. The aim is to provide an appreciation for the range of techniques that have been developed, rather than to simply list sources. Segmentation methods are listed under four main headings. What may be termed the "classical" approach consists of methods that partition the input image into subimages, which are then classified. The operation of attempting to decompose the image into classifiable units is called "dissection". The second class of methods avoids dissection, and segments the image either explicitly, by classification of prespecified windows, or implicitly by classification of subsets of spatial features collected from the image as a whole. The third strategy is a hybrid of the first two, employing dissection together with recombination rules to define potential segments, but using classification to select from the range of admissible segmentation possibilities offered by these subimages. Finally, holistic approaches that avoid segmentation by recognizing entire character strings as units are described.
Keyphrases
character segmentation admissible segmentation possibility holistic approach recombination rule recent progress critical area potential segment good part recognition rate second class prespecified window character string ocr process classifiable unit input image entire character string spatial feature isolated character classical approach third strategy method avoids dissection main heading segmentation method insightful handling
