Simple 1-D image enhancement for head-mounted low vision aid
Author:
- 1 January 1999
- journal article
- Published by Swets & Zeitlinger Publishers in Visual Impairment Research
- Vol. 1 (1) , 3-10
Abstract
High-contrast binary images (black and white without shades of gray) were demonstrated to improve face recognition performance by the visually impaired using static images (Peli et al., Invest Ophthalmol Vis Sci 1991;32:2337-2350). A binary head-mounted display device has now been adapted to present video in real time for testing as a low vision mobility aid (an electronic telescope). When used for text presentation (as a head-mounted CCTV), a single threshold produces satisfactory performance. However, binarization of a video signal through a single threshold results in high-contrast but extremely poor image detail. A more detailed binary image can be obtained by applying bandpass filtering prior to thresholding. The application of the adaptive 2-D enhancement technique used by the DigiVision device enables such live bandpass processing and provides substantial improvement. To reduce the cost, weight, and power consumption of a portable low vision aid, a one dimensional (1-D) analog video processing alte...Keywords
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