Image analysis – Applications – Reading aids for the visually impaired
Patent
1994-01-31
1996-12-17
Couso, Yon J.
Image analysis
Applications
Reading aids for the visually impaired
348 63, G06K 900
Patent
active
055861962
ABSTRACT:
A digital document magnifier for scanning and digitizing printed information, processing the information, and displaying the processed information on a display screen is provided. The digital document magnifier software analyzes the contents of a document and then automates presentation of the document to a viewer. The system includes a microprocessor for processing the scanned information, and displayable video memory for storing information to be displayed. The video memory is organized as a two-dimensional circular display buffer. The two-dimensional buffer is used to zoom incrementally an image to the display screen as necessary. The magnifier can provide either one data bit per pixel for a monochrome display, or four data bits per pixel for a color or greyscale display. Methods for scaling coordinates between a source image bitmap buffer and a two-dimensional circular display buffer also are provided. The methods include dynamically re-mapping page geometry to obtain continuous line effects and continuous column effects.
REFERENCES:
patent: 3848234 (1974-11-01), MacDonald
patent: 3924244 (1975-12-01), Seitz
patent: 3959778 (1976-05-01), Brette
patent: 3976980 (1976-08-01), Hertz
patent: 4549275 (1985-10-01), Sukonick
patent: 4774581 (1988-09-01), Shirtsuchi
patent: 4821086 (1989-04-01), McNeely et al.
patent: 4829453 (1989-05-01), Katsuta et al.
patent: 4841454 (1989-06-01), Awazu
patent: 4918526 (1990-04-01), Lewis
patent: 4941195 (1990-07-01), Tanaka et al.
patent: 5010324 (1991-04-01), Yamamoto
patent: 5021772 (1991-06-01), King et al.
patent: 5029228 (1991-07-01), Nonoyama et al.
patent: 5038138 (1991-08-01), Akiyama et al.
patent: 5053761 (1991-10-01), Webster, III
patent: 5075673 (1991-12-01), Yanker
patent: 5130794 (1992-07-01), Ritchey
patent: 5179648 (1993-01-01), Hauck
patent: 5289569 (1994-02-01), Taniguchi
J. C. DeWitt, E. M. Schreier, J. Leventhal, Journal of Visual Impairment & Blindness, pp. 151-199 (Apr. 1988).
Venture, pp. 11, 51 (Mar. 1989).
G. E. Legge, G. S. Rubin, D. G. Pelli, M. M. Schleske, A. Luebker, J. A. Ross, Journal of Visual Impairment & Blindness, pp. 54-59 (Feb. 1988).
J. C. DeWitt, E. M. Schreier, J. D. Leventhal, and A. M. Meyers, Journal of Visual Impairment & Blindness, pp. 402-440, (Dec. 1988).
RDC Newsletter, pp. 11-13 (Dec. 1986).
Gerald E. Fonda, M.D., Management of Low Vision (Thieme-Stratton, Inc., New York, 1981), Table of Contents, pp. 80-85, 160-165, 234-235.
Clinical Low Vision (Eleanor E. Fay, M.D., F.A.C.S., ed., Little, Brown and Company, Boston, 1984), Table of Contents, pp. 70, 96-98, 138-141.
Randy Stern, Advanced Imaging, pp. 32, 34, 59 (Jun. 1989).
Xerox/Kurzweil, Cambridge, Massachusetts (Personal Reader brochure, 1988).
Ian L. Baily, Lawrence H. Boyd, Wesley L. Boyd, and Marleen Clark, American Journal of Optometry and Physiological Optics, vol. 64, pp. 678-685 (1987).
J. E. Lovie-Kitchin, George C. Woo, Effect of Magnification and Field of View on Reading Speed Using a CCTV, pp. 308-322, in Low Vision Principles and Applications (George C. Woo, ed., Springer-Verlag, New York, 1986).
Robert A. Ulichney, Digital Scaling of Binary Images, (1979) (unpublished M.S. thesis, Massachusetts Institute of Technology).
Journal of Visual Impairment & Blindness, pp. 113-114, (Mar. 1988).
Couso Yon J.
Inz Richard A.
Treyz G. Victor
LandOfFree
Digital document magnifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital document magnifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital document magnifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1998663