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Curvature-based face detector

  • US 10,366,278 B2
  • Filed: 05/11/2017
  • Issued: 07/30/2019
  • Est. Priority Date: 09/20/2016
  • Status: Active Grant
First Claim
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1. A method for processing data, comprising:

  • receiving a depth map of a scene containing at least a humanoid head, the depth map comprising a matrix of pixels having respective pixel depth values;

    using a digital processor, extracting from the depth map a curvature map of the scene, the curvature map comprising respective curvature values of at least some of the pixels in the matrix; and

    processing the curvature values in order to detect and segment one or more blobs in the curvature map over which the pixels have respective curvature values that are indicative of a convex surface, to calculate a roll angle of each of the one or more blobs corresponding to an axis perpendicular to a dominant direction of a curvature orientation of the pixels in each of the one or more blobs, and to identify one of the blobs as a face in the scene by applying a face classifier filter to the one or more blobs to calculate a score for each pixel indicating a likelihood that it is a center point of the face while normalizing a rotation between the one or more blobs and the filter using the calculated roll angle.

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