Method and apparatus for extracting features of moving objects

  • US 5,687,249 A
  • Filed: 09/01/1994
  • Issued: 11/11/1997
  • Est. Priority Date: 09/06/1993
  • Status: Expired due to Fees
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First Claim
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1. A method for acquiring a feature of a moving object, said method comprising:

  • an image capturing step using a fixed TV camera for performing image-sensing of said moving object at least two times along a predetermined section of the path of travel of said moving object from a position on a line crossing the path of travel of said moving object;

    a silhouette extraction step for calculating the difference between each image of said moving object captured by said TV camera and its background image to generate a silhouette for said each image of said moving object;

    a relative position calculation step for calculating the relative positions of the viewpoint of said TV camera and said moving object on the basis of information about a surface feature point of said moving object in said each image; and

    a shape extraction step for extracting the shape of said moving object as a reconstructed shape by projecting said silhouette of said each image into a three-dimensional projection space assumed to be large enough to accommodate an assumed version of the shape of said moving object on the assumption that said viewpoint of said TV camera and said moving object are held at said relative positions.

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