Multi-pattern Embedded Phase Shifting Using a High-Speed Projector for Fast and Accurate Dynamic 3D Measurement

Maruyama, Michika; Tabata, Satoshi; Watanabe, Yoshihiro

doi:10.1109/wacv.2018.00106

Cited by 14 publications

(12 citation statements)

References 25 publications

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“…Although methods have been proposed to reduce the number of projections by distributing each pattern in RGB and projecting them simultaneously [31,32,33,34], in all these methods, the measurement accuracy depends on the surface color of the target object. Moreover, a method has also been proposed in which the phase-shift pattern is expressed in seven bits and the Gray-code pattern is expressed in one bit [7]; and by adjusting the projection time for each bit of the projector, the patterns are embedded in one image [7]. However, two cameras should be placed coaxially to capture the respective patterns, which makes the system complex and calls for high-precision alignment of the camera axes.…”

Section: Related Methodsmentioning

confidence: 99%

“…However, it can measure independently for each pixel; thus, high resolution can be achieved. Therefore, methods that speed up the Gray code method [6] or the phase-shift method [7] have also been proposed. In particular, the phase-shift method requires a few patterns, and pixel correspondence can be achieved with subpixel accuracy; therefore, the distance can be measured with high accuracy.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, an 8-bit projector at 1000 fps has been realized in recent years [8]. The projection time can be reduced, and environments capable of measuring moving objects even in the multi-shot type are available [7].…”

Section: Introductionmentioning

confidence: 99%

“…Methods have been proposed to solve the motion error problem, by motion compensation [12,13], or reducing the number of projections [7,14,15]. Particularly, the approach to reduce the number of projections is considered to be promising to achieve high accuracy with the small calculation amount.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, reducing the processing time is also important to achieve real-time measurement. There is the system which achieved 500 fps based on combination of phase-shift method and high-speed projector [7]. However, this system needs additional camera which placed coaxially, and the camera axes are aligned high-precision.…”

Section: Introductionmentioning

confidence: 99%

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Pixelwise Phase Unwrapping Based on Ordered Periods Phase Shift

Tabata

Maruyama

Watanabe

et al. 2019

Sensors

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The existing phase-shift methods are effective in achieving high-speed, high-precision, high-resolution, real-time shape measurement of moving objects; however, a phase-unwrapping method that can handle the motion of target objects in a real environment and is robust against global illumination as well is yet to be established. Accordingly, a robust and highly accurate method for determining the absolute phase, using a minimum of three steps, is proposed in this study. In this proposed method, an order structure that rearranges the projection pattern for each period of the sine wave is introduced, so that solving the phase unwrapping problem comes down to calculating the pattern order. Using simulation experiments, it has been confirmed that the proposed method can be used in high-speed, high-precision, high-resolution, three-dimensional shape measurements even in situations with high-speed moving objects and presence of global illumination. In this study, an experimental measurement system was configured with a high-speed camera and projector, and real-time measurements were performed with a processing time of 1.05 ms and a throughput of 500 fps.

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