Interframe consistent multifrequency phase unwrapping for time-of-flight cameras
- Interframe consistent multifrequency phase unwrapping for time-of-flight cameras
- 최욱; 이승규; 임화섭
- time-of-flight camera; phase unwrapping; Markov random fields
- Issue Date
- Optical engineering
- VOL 52, NO 5, 057005-1-057005-12
- 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.
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