Translator Disclaimer
7 March 1996 Character segmentation and thresholding in low-contrast scene images
Author Affiliations +
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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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
PROCEEDINGS
11 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

Pavement crack detection based on texture feature
Proceedings of SPIE (December 08 2011)
Scene matching with radar images
Proceedings of SPIE (June 09 1996)
Automatic text extraction from color image
Proceedings of SPIE (May 29 2000)
Logo detection using wavelet co-occurrence histograms
Proceedings of SPIE (January 27 2008)

Back to Top