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Tracking and determining pictures in successive interdependency levels

  • US 9,716,883 B2
  • Filed: 09/30/2014
  • Issued: 07/25/2017
  • Est. Priority Date: 11/13/2006
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • receiving a video stream comprising a sequence of compressed pictures, the compressed pictures comprising a plurality of levels of picture importance including a first picture level and a second picture level;

    performing a first level of tracking of pictures of the received stream to ascertain whether pictures belong to a first level;

    performing a second level of tracking of pictures with an ascending presentation time stamp (PTS), wherein performing a second level of tracking of pictures comprises;

    ascertaining the first level of pictures based on an indicated adherence to one or more picture independency rules received with the video stream,determining that a predetermined number of first level of pictures have been tracked, andperforming, when the predetermined number of first level pictures have been tracked, the second level tracking of pictures with the ascending PTS; and

    classifying pictures immediately subsequent to pictures tracked at the second level of tracking as candidates for a third level of tracking; and

    processing the sequence of compressed pictures of the video stream based on whether pictures belong to the first level, the second level, and the third level.

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