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Target tracking

  • US 8,121,346 B2
  • Filed: 06/08/2007
  • Issued: 02/21/2012
  • Est. Priority Date: 06/16/2006
  • Status: Active Grant
First Claim
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1. A method of tracking a target imaged in video footage, the method comprising the steps of:

  • (i) identifying the target to be tracked in a first image frame, the target being located at a first position;

    (ii) defining a first template area around the first position;

    (iii) generating a first population of sub-templates by sampling from the first template area;

    (iv) searching for an instance of each of the first population of sub-templates in a second image frame, and determining the location of each instance in the second image frame;

    (v) determining a second position of the target in the second image frame in dependence on the locations of the instances;

    (vi) selecting a selection of the first population of sub-templates in dependence on the locations of the instances of each of the sub-templates in the second frame;

    (vii) defining a second template area defined around the second position;

    (viii) generating a second population of sub-templates comprising the selection of the first population of sub-templates, and a set of new sub-templates generated by sampling from the second template area; and

    (ix) iterating steps (iv) to (viii) above in respect of further image frames, using the second population of sub-templates and the second position from a preceding iteration in place of the first population of sub-templates and the first position, thereby determining a series of target positions, and inferring the target track therefrom,wherein the step of identifying a second position of the target comprises the step of determining a permitted area, and constraining the second position to lie within the permitted area, andwherein the step of searching for an instance of each of the first population of sub-templates in a second image frame includes searching areas of the second image frame outside the permitted area.

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