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Methods and apparatus for use in surveillance systems

  • US 7,508,941 B1
  • Filed: 07/22/2003
  • Issued: 03/24/2009
  • Est. Priority Date: 07/22/2003
  • Status: Expired due to Fees
First Claim
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1. A method of conducting surveillance comprising:

  • placing a video data acquisition system (VDAS) in a public place to conduct surveillance of the public place;

    operating the VDAS, the VDAS producing a video signal depicting the public place, the video signal including a series of frames that correspond to different moments in time;

    encrypting the video signal using a first key, the first key being randomly generated such that a new randomly generated first key is used at different points in time;

    encrypting the first key using a second key;

    including at least the encrypted first key and encrypted video signal in an output signal;

    operating an image analyzer, the image analyzer;

    receiving the video signal from the VDAS;

    identifying a person depicted in a frame of the video signal by analyzing each frame of the video signal to look for patterns corresponding to specific persons; and

    for every identified person, embedding a code corresponding to that identified person in the output signal, the code being associated with the particular frame in which the pattern corresponding to the identified person was found;

    storing the output signal in a data storage medium;

    searching the data storage medium for a code corresponding to a specific person; and

    upon finding the code corresponding to the specific person in the data storage medium;

    decrypting, with the second key, the first key used to encrypt a portion of the video signal containing the frames associated with the code corresponding to the specific person;

    decrypting, with the decrypted first key, the portion of the video signal containing the frames associated with the code corresponding to the specific person; and

    displaying the portion of the video signal containing the frames associated with the code corresponding to the specific person.

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