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Videotracking

  • US 8,542,874 B2
  • Filed: 12/18/2007
  • Issued: 09/24/2013
  • Est. Priority Date: 07/11/2007
  • Status: Expired due to Fees
First Claim
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1. A method for tracking an object in a sequence of video frames, characterized by the following steps:

  • before performing a template matching algorithm;

    creating a model with characteristic features for the object to be tracked;

    wherein a first component of the model contains at least one geometric dimension being a geometric shape of the object; and

    wherein a second component of the model contains a color of the object;

    defining a region of interest, ROI, inside which the object should be tracked; and

    performing the template matching algorithm in individual frames of the sequence of video frames on the basis of the created model for determining a position of the object in the respective frame, the template matching algorithm consisting of moving the template over a search region of the respective frame, wherein the search region is determined by a dynamic prediction for the object and comparing the template with the search region pixel by pixel, the comparing using both the first component and the second component;

    characterized in that;

    in dependence on the result of the template matching algorithm, an uncertainty factor is assigned to the position of the object determined by the template matching algorithm;

    a correction algorithm is included in the determination of the position of the object, when the uncertainty factor exceeds an uncertainty threshold; and

    as a first measure, the correction algorithm continues to automatically output a position forecast by the prediction as the current object position over a certain period, until the uncertainty factor falls below the uncertainty threshold.

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