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

Ouk Choi; Seungkyu Lee; Hwasup Lim

doi:10.1117/1.OE.52.5.057005

15 May 2013 Interframe consistent multifrequency phase unwrapping for time-of-flight cameras

Ouk Choi, Seungkyu Lee, Hwasup Lim

Author Affiliations +

Optical Engineering, Vol. 52, Issue 5, 057005 (May 2013). https://doi.org/10.1117/1.OE.52.5.057005

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.

Citation Download Citation

Ouk Choi, Seungkyu Lee, and Hwasup Lim "Interframe consistent multifrequency phase unwrapping for time-of-flight cameras," Optical Engineering 52(5), 057005 (15 May 2013). https://doi.org/10.1117/1.OE.52.5.057005

Published: 15 May 2013

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