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Vertical compensation in a moving camera

  • US 6,781,623 B1
  • Filed: 07/13/2000
  • Issued: 08/24/2004
  • Est. Priority Date: 07/19/1999
  • Status: Expired due to Term
First Claim
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1. An image processing apparatus, comprising:

  • a digital signal processor for processing a sequence of image frames collectively forming a motion picture, wherein the digital signal processor is arranged to;

    determine a vertical alignment axis for each frame of the sequence from an analysis of the data content of that frame, wherein the analysis includes the digital signal processor arranged to;

    identify perpendicular lines between data objects in the frame; and

    evaluate the intersection of the perpendicular lines to determine the vertical alignment axis in the frame;

    apply a rotational transform to each frame to map the vertical alignment axis determined by the analysis onto a fixed alignment axis of the frame; and

    output the sequence of image frames thus transformed to compensate for vertical misalignment of the data content of the frames.

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