Interframe consistent multifrequency phase unwrapping for time-of-flight cameras

Title
Interframe consistent multifrequency phase unwrapping for time-of-flight cameras
Authors
최욱이승규임화섭
Keywords
time-of-flight camera; phase unwrapping; Markov random fields
Issue Date
2013-05
Publisher
Optical engineering
Citation
VOL 52, NO 5, 057005-1-057005-12
Abstract
Commercially available time-of-flight cameras illuminate the scene with amplitude-modulated infrared light signals and detect their reflections to provide per-pixel depth maps in real time. These cameras, however, suffer from an inherent problem called phase wrapping, which occurs due to the modular ambiguity in the phase delay measurement. As a result, the measured distance to a scene point becomes much shorter than its actual distance if the point is farther than a certain maximum range. There have been multifrequency phase unwrapping methods, which recover the actual distance values by exploiting the consistency in the disambiguated depth values across depth maps of the same scene, acquired at different modulation frequencies. For robust and accurate estimation against noise, a cost function is built that evolves over time to enforce both the interframe depth consistency and the intraframe depth continuity. As demonstrated in the experiments with real scenes, the proposed method correctly disambiguates the depth measurements, extending the maximum range restricted by the modulation frequency.
URI
http://pubs.kist.re.kr/handle/201004/44905
ISSN
00913286
Appears in Collections:
KIST Publication > Article
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