Enhanced three-dimensional reconstruction of surfaces using multicolor gratings

Gilbert, Bernard S.; Blatt, Joel H.

doi:10.1117/1.602335

Cited by 6 publications

(1 citation statement)

References 8 publications

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“…Also, use of more patterns for various improvements is impossible. The other approach projects a single grating but steps it frame by frame mechanically [2] or electrically [3], [4], [5]. But an essential disadvantage exists in this sequential scheme.…”

Section: Introductionmentioning

confidence: 96%

Spatio-temporal phase-encoding profilometry using correlation image sensor

Ando

2008

2008 IEEE International Symposium on Industrial Electronics

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In this paper, we propose a real-time 3-D shape measurement system which consists of 1) a moving fringe projector for spatio-temporal encoding (single frequency in time but different phase in space) of illumination angle, and 2) the three-phase correlation image sensor (3PCIS) which performs the synchronous detection and amplitude/phase demodulation of intensity-modulated light in real time on each pixel. The 3PCIS demodulates amplitude and phase of moving fringes in a scene frame by frame. Then, it is unwrapped in real-time to a sequence of projection angle maps based on an efficient use of spatial and temporal continuity of the phase maps. Compared with the phase-shift method using a color image sensor or a high speed camera, the system is shown to have novel characteristics; pixel by pixel capture of phase map in a single frame, freedom from environmental light sources and grayness nonlinearity of fringes, reduced sensitivity to object motion, etc. We implemented this system using CMOS 200×200 and 320×256 pixel 3PCIS recently developed by us.

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