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Face and other object detection and tracking in off-center peripheral regions for nonlinear lens geometries

  • US 8,982,180 B2
  • Filed: 04/02/2011
  • Issued: 03/17/2015
  • Est. Priority Date: 03/31/2011
  • Status: Active Grant
First Claim
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1. Within an image acquisition system comprising a non-linear, wide-angled lens and an imaging sensor, a method of enhancing a scene containing one or more off-center peripheral regions, the method comprising:

  • acquiring, using the non-linear, wide-angled lens and the imaging sensor, an initial distorted image with a large field of view;

    determining and extracting an off-center region of interest (hereinafter “

    ROI”

    ) within said initial distorted image;

    wherein the ROI includes a portion from said initial distorted image that has uncorrected distortion;

    applying an initial object detection process to said off-center ROI that includes the portion from said initial distorted image having uncorrected distortion;

    responsive to the initial object detection process successfully detecting an object within the off-center ROI;

    applying geometric correction to remove distortion from the off-center ROI to produce a undistorted reconstructed ROI, without applying the geometric correction to said entire initial distorted image;

    applying a second object detection process to one or more regions within the undistorted reconstructed ROI;

    wherein the second object detection process is different than the initial object detection process.

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