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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 21, Iss. 6 — Jun. 1, 2004
  • pp: 937–950

Wideband enhancement of television images for people with visual impairments

Eli Peli, Jeonghoon Kim, Yitzhak Yitzhaky, Robert B. Goldstein, and Russell L. Woods  »View Author Affiliations


JOSA A, Vol. 21, Issue 6, pp. 937-950 (2004)
http://dx.doi.org/10.1364/JOSAA.21.000937


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Abstract

Wideband enhancement was implemented by detecting visually relevant edge and bar features in an image to produce a bipolar contour map. The addition of these contours to the original image resulted in increased local contrast of these features and an increase in the spatial bandwidth of the image. Testing with static television images revealed that visually impaired patients (n=35) could distinguish the enhanced images and preferred them over the original images (and degraded images). Most patients preferred a moderate level of wideband enhancement, since they preferred natural-looking images and rejected visible artifacts of the enhancement. Comparison of the enhanced images with the originals revealed that the improvement in the perceived image quality was significant for only 22% of the patients. Possible reasons for the limited increase in perceived image quality are discussed, and improvements are suggested.

© 2004 Optical Society of America

OCIS Codes
(100.2980) Image processing : Image enhancement
(110.3000) Imaging systems : Image quality assessment
(120.2040) Instrumentation, measurement, and metrology : Displays
(330.3790) Vision, color, and visual optics : Low vision
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5510) Vision, color, and visual optics : Psychophysics

History
Original Manuscript: October 3, 2003
Revised Manuscript: January 13, 2004
Manuscript Accepted: January 13, 2004
Published: June 1, 2004

Citation
Eli Peli, Jeonghoon Kim, Yitzhak Yitzhaky, Robert B. Goldstein, and Russell L. Woods, "Wideband enhancement of television images for people with visual impairments," J. Opt. Soc. Am. A 21, 937-950 (2004)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-21-6-937

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