High-speed 3D shape measurement by one pitch phase analysis method using brightness values in small square area of single-shot image

Morimoto, Yoshiharu; Masaya, Akihiro; Ueki, Masaki

doi:10.1016/j.optlaseng.2018.08.023

Cited by 16 publications

(14 citation statements)

References 8 publications

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“…In this chapter, the theory of the OPPA method is described by adding the detailed explanation to the reference [17], in order to help understanding of the discussion in later chapters.…”

Section: Principle Of the Oppa Methodsmentioning

confidence: 99%

“…Therefore, the length GH of the image of one pitch length CD on reference plane was the same as the length of IJ of the image of one pitch length EF on object plane. The detailed proof is shown in Reference [17]. Once the number of pixels of the grating for one pitch was adjusted to the integer N, even if the height of the object changed, the number of pixels of one pitch in the image of the grating of the object did not change; only the phase of the gating was dependent on the height.…”

Section: Shape Measurement By the Oppa Methodsmentioning

confidence: 99%

“…The authors proposed the one pitch phase analysis (OPPA) method [15][16][17][18] in which phase analysis of the grating pattern is performed with one image.…”

Section: Introductionmentioning

confidence: 99%

“…The principles and application examples of this OPPA method were presented in a paper [17] and proceedings of a few international conferences [15,16,18]. Utilizing the characteristics of the OPPA method, which allows phase analysis of a grating with a single image, it measures the vibration mode of a flat cantilever plate in combination with a high-speed camera [16].…”

Section: Introductionmentioning

confidence: 99%

“…Brightness distribution and phase distribution for OPPA3[17] (blue, brown, red and green lines show phases of 0, 90, 180 and 270 degrees, respectively. ).…”

mentioning

confidence: 99%

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High-Speed Measurement of Shape and Vibration: Whole-Field Systems for Motion Capture and Vibration Modal Analysis by OPPA Method

Morimoto

2020

Sensors

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In shape measurement systems using a grating projection method, the phase analysis of a projected grating provides accurate results. The most popular phase analysis method is the phase shifting method, which requires several images for one shape analysis. Therefore, the object must not move during the measurement. The authors previously proposed a new accurate and high-speed shape measurement method, i.e., the one-pitch phase analysis (OPPA) method, which can determine the phase at every point of a single image of an object with a grating projected onto it. In the OPPA optical system, regardless of the distance of the object from the camera, the one-pitch length (number of pixels) on the imaging surface of the camera sensor is always constant. Therefore, brightness data for one pitch at any point of the image can be easily analyzed to determine phase distribution, or shape. This technology will apply to the measurement of objects in motion, including automobiles, robot arms, products on a conveyor belt, and vibrating objects. This paper describes the principle of the OPPA method and example applications for real-time human motion capture and modal analysis of free vibration of a flat cantilever plate after hammering. The results show the usefulness of the OPPA method.

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“…In this chapter, the theory of the OPPA method is described by adding the detailed explanation to the reference [17], in order to help understanding of the discussion in later chapters.…”

Section: Principle Of the Oppa Methodsmentioning

confidence: 99%

Section: Shape Measurement By the Oppa Methodsmentioning

confidence: 99%

“…The authors proposed the one pitch phase analysis (OPPA) method [15][16][17][18] in which phase analysis of the grating pattern is performed with one image.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Brightness distribution and phase distribution for OPPA3[17] (blue, brown, red and green lines show phases of 0, 90, 180 and 270 degrees, respectively. ).…”

mentioning

confidence: 99%

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