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Proceedings Paper

Harmonic distortion free distance estimation in ToF camera
Author(s): Byongmin Kang; Seong-Jin Kim; Seungkyu Lee; Keechang Lee; James D. K. Kim; Chang-Yeong Kim
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Paper Abstract

A Time-of-Flight (ToF) camera uses a near infrared (NIR) to obtain the distance from the camera to an object. The distance is calculated from the amount of time shift between the emitted and reflected NIR. ToF cameras generally modulate NIR with a square wave rather than a sinusoidal wave due to its difficulty in hardware implementation. The previous method using simple trigonometric function estimates the time shift with the difference of electrons generated by the reflected square wave. Thus the estimated time shift includes a harmonic distortion caused by the nonlinearity of trigonometric function. In this paper, we propose a new linear estimation method to reduce the harmonic distortion. For quantitative evaluation, the proposed method is compared to the previous method using our prototype ToF depth camera. Experimental results show that the distance obtained by the proposed method is more accurate than that by the previous method.

Paper Details

Date Published: 27 January 2011
PDF: 9 pages
Proc. SPIE 7864, Three-Dimensional Imaging, Interaction, and Measurement, 786403 (27 January 2011); doi: 10.1117/12.872313
Show Author Affiliations
Byongmin Kang, Samsung Electronics Co., Ltd. (Korea, Republic of)
Seong-Jin Kim, Samsung Electronics Co., Ltd. (Korea, Republic of)
Seungkyu Lee, Samsung Electronics Co., Ltd. (Korea, Republic of)
Keechang Lee, Samsung Electronics Co., Ltd. (Korea, Republic of)
James D. K. Kim, Samsung Electronics Co., Ltd. (Korea, Republic of)
Chang-Yeong Kim, Samsung Electronics Co., Ltd. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7864:
Three-Dimensional Imaging, Interaction, and Measurement
J. Angelo Beraldin; Ian E. McDowall; Atilla M. Baskurt; Margaret Dolinsky; Geraldine S. Cheok; Michael B. McCarthy; Ulrich Neuschaefer-Rube, Editor(s)

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