Character segmentation and thresholding in low-contrast scene images

Lowell LeRoy Winger; M. Ed Jernigan; John A. Robinson

doi:10.1117/12.234710

7 March 1996 Character segmentation and thresholding in low-contrast scene images

Lowell LeRoy Winger, M. Ed Jernigan, John A. Robinson

Proceedings Volume 2660, Document Recognition III; (1996) https://doi.org/10.1117/12.234710
Event: Electronic Imaging: Science and Technology, 1996, San Jose, CA, United States

Abstract

We are developing a portable text-to-speech system for the vision impaired. The input image is acquired with a lightweight CCD camera that may be poorly focused and aimed, and perhaps taken under inadequate and uneven illumination. We therefore require efficient and effective thresholding and segmentation methods which are robust with respect to character contrast, font, size, and format. In this paper, we present a fast thresholding scheme which combines a local variance measure with a logical stroke-width method. An efficient post- thresholding segmentation scheme utilizing Fisher's linear discriminant to distinguish noise and character components functions as an effective pre-processing step for the application of commercial segmentation and character recognition methods. The performance of this fast new method compared favorably with other methods for the extraction of characters from uncontrolled illumination, omnifont scene images. We demonstrate the suitability of this method for use in an automated portable reader through a software implementation running on a laptop 486 computer in our prototype device.

Citation Download Citation

Lowell LeRoy Winger, M. Ed Jernigan, and John A. Robinson "Character segmentation and thresholding in low-contrast scene images", Proc. SPIE 2660, Document Recognition III, (7 March 1996); https://doi.org/10.1117/12.234710

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