Affine registration of three-dimensional point sets for improving the accuracy of eye position trackers

Donghoon Kang; Jinwook Kim; Sung-Kyu Kim

doi:10.1117/1.OE.56.4.043105

20 April 2017 Affine registration of three-dimensional point sets for improving the accuracy of eye position trackers

Donghoon Kang, Jinwook Kim, Sung-Kyu Kim

Author Affiliations +

Optical Engineering, Vol. 56, Issue 4, 043105 (April 2017). https://doi.org/10.1117/1.OE.56.4.043105

Abstract

Existing methods for tracking three-dimensional (3-D) eye positions with a monocular color camera mostly rely on a generic 3-D face model and a certain face database. However, the performance of these methods is susceptible to the variations of head poses. For this reason, existing methods for estimating 3-D eye position from a single two-dimensional face image may yield erroneous results. To improve the accuracy of 3-D eye position trackers using a monocular camera, we present a compensation method as a postprocessing technique. We address the problem of determining an optimal registration function for fitting 3-D data consisting of the inaccurate estimates from the eye position tracker and their corresponding ground truths. To obtain the ground truths of 3-D eye positions, we propose two different systems by combining an optical motion capture system and checkerboards, which construct the form of the hand-eye and robot-world calibration. By solving a least-squares optimization problem, we can determine the optimal registration function in an affine form. Real experiments demonstrate that the proposed method can considerably improve the accuracy of 3-D eye position trackers using a single color camera.

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Donghoon Kang, Jinwook Kim, and Sung-Kyu Kim "Affine registration of three-dimensional point sets for improving the accuracy of eye position trackers," Optical Engineering 56(4), 043105 (20 April 2017). https://doi.org/10.1117/1.OE.56.4.043105

Received: 21 September 2016; Accepted: 5 April 2017; Published: 20 April 2017

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