Digital filtering enhances ability to read and to recognize objects. Possible to construct portable vision aid by combining miniature video equipment to observe scene and display images with very-large-scale integrated circuits to implement real-time digital image-data processing. Afflicted observer views scene through magnifier to shift spatial frequencies downward and thereby improves perceived image. However, less magnification needed, larger the scene observed. Thus, one measure of effectiveness of new system is amount of magnification required with and without it. In series of tests, found 27 to 70 percent more magnification needed for afflicted observers to recognize unfiltered words than to recognize filtered words.
Image-Enhancement Aid For The Partially Sighted
NASA Tech Briefs ; 13 , 6
01.06.1989
Sonstige
Keine Angabe
Englisch
Creative System Design for the Partially Sighted
British Library Conference Proceedings | 2000
|Safe Travelling for Blind and Partially - Sighted People in Europe
British Library Conference Proceedings | 2001
|SAFE WALKING FOR BLIND AND PARTIALLY - SIGHTED PEOPLE IN EUROPE
British Library Conference Proceedings | 2001
|THE PEDESTRIAN ENVIRONMENT - USER FRIENDLY OR `NO-GO' FOR BLIND AND PARTIALLY SIGHTED PEOPLE?
British Library Conference Proceedings | 1998
|Online Contents | 1994