Paper Info
Title
Harmonic distortion free distance estimation in ToF camera
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.
Year
DOI
Venue
2011
10.1117/12.872313
Proceedings of SPIE
Keywords
Field
DocType
ToF(Time-of-flight),Harmonic distortion,Time-shift,Square wave,Modulation frequency
Nonlinear system,Trigonometric functions,Total harmonic distortion,Near-infrared spectroscopy,Optics,Square wave,Frequency modulation,Distortion,Sine wave,Physics
Conference
Volume
ISSN
Citations 
7864
0277-786X
4
PageRank 
References 
Authors
0.67
0
6
Name
Order
Citations
PageRank
Byongmin Kang1426.26
Seongjin Kim2112.70
Seungkyu Lee325226.33
KeeChang Lee4959.24
James D. K. Kim56111.58
Chang-Yeong Kim615829.48