Shiny parts measurement using color separation

Hu, Qingying; Harding, Kevin G.; Du, Xiaoming; Hamilton, Don

doi:10.1117/12.629942

Cited by 43 publications

(26 citation statements)

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“…In particular, the quality of fringe images is the net effect of camera exposure time, camera sensor gain, lens aperture, intensity of projected light, reflectivity and shape of measured surfaces, environment light, shading and occasions, etc., so in order to improve the quality of fringe image of surfaces with large reflectivity variation range, many research works tried to control some of these factors [11][12][13][14][15][16][17][18][19][20]. Kowarschik et al [11] used proper measurement arrangement to avoid saturating camera sensor.…”

Section: Oet Calibration Methodsmentioning

confidence: 99%

Enhanced phase measurement profilometry for industrial 3D inspection automation

Zhong

Zhou

et al. 2014

Int J Adv Manuf Technol

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Industrial metrology and inspection systems commonly rely on phase measurement profilometry (PMP) using sinusoidal fringe patterns projecting, yielding dense, and accurate 3D reconstruction regardless of the presence of texture. However, applying PMP method to industrial 3D inspection is still a big challenging problem due to rigorous industrial measurement conditions including large surface reflectivity variation range and vibration. Aiming to solve these problems, an enhanced phase measurement profilometry (EPMP) is proposed. In EPMP, an optimal exposure time (OET) calibration method is proposed to solve large surface reflectivity variation range problem, and it can avoid saturating the camera sensor in areas of specular reflection while keep the signalto-noise ratio (SNR) of fringe image in areas of weak reflection at most. To resist the influence of vibration, an improved pose calibration method (IPC) is used to allow fast calibration of pose of cameras by acquiring only one image of planar target. Moreover, an automatic online 3D inspection system for evaluating 3D geometric dimension quality of railway truck adapter (RTA) is developed, and according to the experiments, the EPMP indicates a satisfactory result in accuracy and repeatability, which can meet the requirements of the 3D inspection task in industrial measurement conditions.

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Section: Oet Calibration Methodsmentioning

confidence: 99%

Enhanced phase measurement profilometry for industrial 3D inspection automation

Zhong

Zhou

et al. 2014

Int J Adv Manuf Technol

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“…[7] This cloud model ought to transform to coordinate system of parts placed. And in FPP, rectification of stereo pairs is applied to accelerate phase matching speed.…”

Section: Calibration Of Virtual Components Principlementioning

confidence: 99%

Calibration of components in an optical measurement system for obtaining 3D data of complex parts

Jiang¹,

Zhou²

2017

Proceedings of the 2017 2nd International Conference on Materials Science, Machinery and Energy Engineering (MSMEE 2017)

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Abstract. In this paper, we study calibration of all components in optical measurement system, which is a fundamental issue in optical measurement. For physical components we use Zhang's method to calibrate the binocular cameras. And we utilize Zhang's method in fringe projection profilometry to calibrate the projector, in which detailed calibration steps are given. For virtual components, three vital coordinate systems need to calibrate in our measurement system. We use cloud registration and epipolar rectification algorithm to locate their position and orientation. The results show that accuracy of physical components' calibration parameters is enough and calibration algorithm for virtual components is feasible.

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“…How to measure this type of parts using the real-time 3-D shape measurement technique remains challenging. There are some techniques proposed Hu et al, 2005;Zhang & Yau, 2009), but none of them are suitable for real-time 3-D measurement cases.…”

Section: Challengesmentioning

confidence: 99%

High-resolution, High-speed 3-D Dynamically Deformable Shape Measurement Using Digital Fringe Projection Techniques

Zhang¹

2010

Advances in Measurement Systems

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Shiny parts measurement using color separation

Cited by 43 publications

References 0 publications

Enhanced phase measurement profilometry for industrial 3D inspection automation

Enhanced phase measurement profilometry for industrial 3D inspection automation

Calibration of components in an optical measurement system for obtaining 3D data of complex parts

High-resolution, High-speed 3-D Dynamically Deformable Shape Measurement Using Digital Fringe Projection Techniques

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