Distance measuring apparatus of a target tracking type

  • US 5,515,448 A
  • Filed: 07/26/1993
  • Issued: 05/07/1996
  • Est. Priority Date: 07/28/1992
  • Status: Expired due to Fees
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First Claim
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1. A distance measuring apparatus for incorporation in a first vehicle, comprising:

  • a plurality of frame memories for receiving quantized density date of an image in successive image frames obtained at fixed intervals of time by imaging a road along which said first vehicle is travelling and for selectively storing the received quantized density data in a matrix of columns and rows;

    comparison means for determining a difference between the quantized density data stored in said frame memories at corresponding coordinate points and for outputting density difference data;

    column accumulation means for accumulating the density difference data output by said comparison means for each of the columns;

    row accumulation means for accumulating the density difference data output by said comparison means for each of the rows;

    tracking means for tracking a second vehicle travelling on said read along a path in front of said first vehicle in accordance with an output of said column accumulation means; and

    distance measurement means for measuring the distance between the first and second vehicles in accordance with an output of said row accumulation means.

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