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System for automatic video segmentation and key frame extraction for video sequences having both sharp and gradual transitions

  • US 5,635,982 A
  • Filed: 06/27/1994
  • Issued: 06/03/1997
  • Est. Priority Date: 06/27/1994
  • Status: Expired due to Fees
First Claim
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1. In a system for parsing a plurality of images in motion without modifying a media in which the images are recorded originally, said images being further divided into plurality sequences of frames, a method for selecting at least one key frame representative of a sequence of said images comprising the steps of:

  • (a) determining a difference metric or a set of difference metrics between consecutive image frames, said difference metrics having corresponding thresholds for selected image features;

    (b) deriving a content difference (Di), said Di being a difference between two current image frames based on said selected image features and said difference metrics, an interval between said two current image frames being adjustable with a skip factor S which defines a resolution at which said image frames are being analyzed;

    (c) accumulating Di between every two said consecutive frames until a sum thereof exceeds a predetermined potential key frame threshold Tk ;

    (d) calculating a difference Da, said Da being a difference between the current frame and the previous key frame based on said difference metrics, or between the current frame and the first frame of said sequence based also on said difference metric if there is no previous key frame, the current frame becoming the key frame if Da exceeds a predetermined key frame threshold Td ; and

    (e) repeating the steps (a) to (d) until the end frame is reached,whereby key frames for indexing sequences of image are identified and captured automatically.

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