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Methods and system for stabilizing live video in the presence of long-term image drift

  • US 8,760,513 B2
  • Filed: 09/30/2011
  • Issued: 06/24/2014
  • Est. Priority Date: 09/30/2011
  • Status: Expired due to Fees
First Claim
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1. A surveillance system of an environment, comprising:

  • a single camera mounted on a structure that is in a substantially fixed position relative to a ground of the environment for generating a plurality of frames of video of the environment, the single camera experiencing pole drift, wherein a plurality of fixed objects in a first video frame of the environment generated by the single camera have moved over a range of a plurality of pixels relative to the plurality of fixed objects in a base video frame of the environment generated by the single camera;

    a memory to store the plurality of frames of video;

    a processor in communication with the memory to process each of the plurality of frames of video by;

    receiving a frame in the plurality of frames of video;

    determining a transient transformation which transforms the frame to a transient coordinate system derived from a transient frame wherein the transient coordinate system is established periodically by selecting a frame from the plurality of frames of video;

    determining a base transformation which transforms the transient coordinate system to a base coordinate system derived from a the base video frame;

    determining a combined transformation that combines the transient and the base transformation; and

    performing the combined transformation on the frame to correct for the pole drift.

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