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Gaze point detection method and gaze point detection device

  • US 9,135,708 B2
  • Filed: 08/09/2011
  • Issued: 09/15/2015
  • Est. Priority Date: 08/09/2010
  • Status: Active Grant
First Claim
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1. A gaze point detection method comprising:

  • a face image production step of producing a face image of a subject as a bright pupil image and a dark pupil image by using at least two cameras and a light source disposed on the outside of apertures of the at least two cameras;

    a vector calculation step of calculating a vector r from a corneal reflection point of the subject to a pupil thereof on a plane perpendicular to a reference line connecting the camera and the pupil according to the face image obtained by each of the at least two cameras;

    a line of sight direction calculation step of calculating respective angles θ

    of lines of sight of the subject with respect to the reference lines of the at least two cameras according to the vectors r corresponding to the at least two cameras from the following expression (1);


    θ

    =f(|r|) 



    (1)by using a function f;

    a parameter correction step of correcting the function f such that at least two gaze points on a predetermined plane determined by the directions of lines of sight calculated so as to correspond to the at least two cameras are closer to each other; and

    a gaze point detection step of calculating the directions of lines of sight according to the expression (1) by using the function f corrected by the parameter correction step and determining an intersection of the lines of sight on the predetermined plane, so as to detect a gaze point of the subject on the predetermined plane,wherein the parameter correction step determines intersections of the lines of sight with respective virtual gaze point planes including positions of at least two cameras and being perpendicular to the reference lines thereof, projects the intersections onto a predetermined projective virtual gaze point plane, and then corrects the function f such that the intersections are closer to each other on the projective virtual gaze point plane.

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