Improved measurement linearity and precision for AMCW time-of-flight range imaging cameras

被引：35
|
作者：
Payne, Andrew D. [1 ]
Dorrington, Adrian A. [1 ]
Cree, Michael J. [1 ]
Carnegie, Dale A. [2 ]
机构：
[1] Univ Waikato, Sch Engn, Hamilton, New Zealand
[2] Victoria Univ Wellington, Sch Engn & Comp Sci, Wellington, New Zealand
来源：
APPLIED OPTICS | 2010年 / 49卷 / 23期
关键词：
All Open Access; Green;
D O I：
10.1364/AO.49.004392
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Time-of-flight range imaging systems utilizing the amplitude modulated continuous wave (AMCW) technique often suffer from measurement nonlinearity due to the presence of aliased harmonics within the amplitude modulation signals. Typically a calibration is performed to correct these errors. We demonstrate an alternative phase encoding approach that attenuates the harmonics during the sampling process, thereby improving measurement linearity in the raw measurements. This mitigates the need to measure the system's response or calibrate for environmental changes. In conjunction with improved linearity, we demonstrate that measurement precision can also be increased by reducing the duty cycle of the amplitude modulated illumination source (while maintaining overall illumination power). (C) 2010 Optical Society of America
引用
收藏
页码：4392 / 4403
页数：12
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