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Digitally enhanced imager for the visually impaired

  • US 5,125,046 A
  • Filed: 07/26/1990
  • Issued: 06/23/1992
  • Est. Priority Date: 07/26/1990
  • Status: Expired due to Fees
First Claim
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1. A digital image enhancing device comprising:

  • a video signal digitizer for converting a received analog video signal to a digital video image having a data portion and a signal portion and for transmitting each said portion individually,sync signal separator receiving said signal portion from said video signal digitizer and for separating said signal portion into at least three separate signals,contrast selector receiving said data portion of said digitized video image and for comparing said data portion to predetermined intensity levels and for enhancing said data portion based on said comparison,clock generator receiving one of said three separate signals from said sync signal separator and for generating a plurality of clock timing signals,top of page detector receiving two of said at least three separate signals from said sync signal separator and for detecting from said two signals a page and for indicating a top of said page,input horizontal counter receiving two of said at least three separate signals from said sync signal separator and for counting said clock signal and associating an input horizonal count to said clock signal,input vertical counter receiving two of said at least three separate signals said sync signal separator and for counting said clock signal and associating an input vertical count to said clock signal,output horizontal counter, receiving one of said plurality of clock timing signals, for counting said clock signal and for associating an output horizontal count with said clock signal,output vertical counter, receiving one of said plurality of clock timing signals, for counting said clock signal and for associating an output vertical count with said clock signal,two input data multiplexors, each receiving said input horizontal count, said input vertical count, said output horizontal count and said output vertical count, said two input data multiplexors providing control signals based on said received counts,two banks of random access memory, for storing said enhanced data portions received from said contrast selector, each said bank controlled by said respective input data multiplexor which alternate storage of said enhanced data portion,and an output multiplexor receiving said indication of said top of said page from said top of page detector and receiving stored data from said two banks of random access memory, said output multiplexor combining said stored data for display.whereby said analog video signal digitized in said video signal digitizer is processed in said contrast selector whereby an individual user selects a contrast level between pertinent features of a video image so that the video image will be displayed in black and white without gray shades.

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