Real-time determination of fringe pattern frequencies: An application to pressure measurement

Sciammarella, Cesar A.; Piroozan, Parham

doi:10.1016/j.optlaseng.2006.08.005

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…With the development of digital image processing technology, the rapid detection of the multiple micro-holes has a feasible way. Digital image processing technology has many advantages, such as non-contact, good reproducibility, high precision, high speed and rich information etc., has been widely used in many fields, including industry monitoring, production automation, non-contact detection, military target detection, which had been obtained huge economic and social benefits [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Research on Optical Feature Recognition Technology of Multiple Micro-Holes

Cai

Liu

2014

AMR

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A rapid quality detection system for multiple micro-holes fabricated by electrochemical machining (ECM) is proposed by studying on the optical features of multiple micro-holes. First, the edge of multiple micro-holes is detected exactly with the digital image processing techniques. Second, the multiple micro-holes are recognized through image skeleton extraction and region segmentation algorithm. Then, the least square circle fit arithmetic; the new roundness measurement algorithm and the surface roughness measurement method are synthetically used in the processing of geometric feature recognition of each micro hole. Finally, the practical results prove that the rapid quality detection system is provided with a fast detection speed and high precision for meeting the quality inspection requirement of multiple micro-holes.

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Section: Introductionmentioning

confidence: 99%

Research on Optical Feature Recognition Technology of Multiple Micro-Holes

Cai

Liu

2014

AMR

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Infrared Deflectometry

Toniuc¹,

Pierron²

2019

Advancements in Optical Methods &Amp; Digital Image Correlation in Experimental Mechanics, Volume 3

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An efficient phase error self-compensation algorithm for nonsinusoidal gating fringes in phase-shifting profilometry

Wang

Yang

2018

Review of Scientific Instruments

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The phase-shifting method is widely used in fringe projection profilometry. Since both the digital light projector and camera used in a grating projection measurement system are nonlinear pieces of equipment, the grating fringes captured by using the camera do not have a good sinusoidal property, which leads to a three-dimensional measurement error. Although the double-step phase-shifting method has proved that the phase error can be reduced to a large extent, the number of grating fringes is doubled, which affects the measurement efficiency. In this paper, we present an efficient phase error self-compensation algorithm. It transforms the initial wrapped phase into a second wrapped phase and integrates the initial and second wrapped phases to reduce the phase error. The advantage is that the measurement accuracy is close to that of the double-step phase-shifting method without increasing the number of projection fringes; at the same time, the measurement time is shortened, and the measurement efficiency is improved. We have elaborated the proposed algorithm in detail and compared it with the traditional single-step phase-shifting method and the double-step phase-shifting method. Finally, we utilize the proposed algorithm to measure different objects. The results prove its effectiveness.

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Real-time determination of fringe pattern frequencies: An application to pressure measurement

Cited by 4 publications

References 13 publications

Research on Optical Feature Recognition Technology of Multiple Micro-Holes

Research on Optical Feature Recognition Technology of Multiple Micro-Holes

Infrared Deflectometry

An efficient phase error self-compensation algorithm for nonsinusoidal gating fringes in phase-shifting profilometry

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