Posed relationship calibration with parallel mirror reflection for stereo deflectometry

Li, Chen; Zhang, Xu; Tu, Dawei

doi:10.1117/1.oe.57.3.034103

Cited by 8 publications

(6 citation statements)

References 19 publications

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“…For instance, a calibration object may have an arbitrary geometry or be a precision mirror with a simple (flat or spherical) shape [257][258][259], it may or may not carry visual markers [191,245,260,261], etc. Calibration procedures may involve accurately moving and tilting this object [262], referencing the measurements against a precision mirror in nominally identical position [263], recording the setup with multiple cameras in order to reduce ambiguity [264,265], or generating a synthetic reference pattern to guide the alignment [266].…”

Section: Relative Component Positions and Orientationsmentioning

confidence: 99%

Deflectometry for specular surfaces: an overview

Burke¹,

Pak²,

Höfer³

et al. 2022

Preprint

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Deflectometry as a technical approach to assessing reflective surfaces has now existed for almost 40 years. Different aspects and variations of the method have been studied in multiple theses and research articles, and reviews are also becoming available for certain subtopics. Still a field of active development with many unsolved problems, deflectometry now encompasses a large variety of application domains, hardware setup types, and processing workflows designed for different purposes, and spans a range from qualitative defect inspection of large vehicles to precision measurements of microscopic optics. Over these years, many exciting developments have accumulated in the underlying theory, in the systems design, and in the implementation specifics. This diversity of topics is difficult to grasp for experts and nonexperts alike and may present an obstacle to a wider acceptance of deflectometry as a useful tool in other research fields and in the industry.This paper presents an attempt to summarize the status of deflectometry, and to map relations between its notable "spin-off" branches. The intention of the paper is to provide a common communication basis for practitioners and at the same time to offer a convenient entry point for those interested in learning and using the method. The list of references is extensive but definitely not exhaustive, introducing some prominent trends and established research groups in order to facilitate further selfdirected exploration by the reader.

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Section: Relative Component Positions and Orientationsmentioning

confidence: 99%

Deflectometry for specular surfaces: an overview

Burke¹,

Pak²,

Höfer³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Though the light source of the projector can be extended to infrared light or ultraviolet light to test surfaces with different reflectivity [50], it is difficult to accurately calibrate the corresponding physical position of the phase on the plate. As the displaying technologies advances currently stereo deflectometry systems [41,47,51] mainly use TFT (Thin Film Transistor) screens to display fringe patterns, since the manufacturing of TFT screens ensures good flatness and accurate pixel spacing of the screen [42,48,49,52]. Camera calibration is to establish the relationship between a space point and the image on camera pixel, which is an essential task for camera based optical 3D measurement systems [55,56].…”

Section: Challenges and Further Developmentmentioning

confidence: 99%

A brief review of the technological advancements of phase measuring deflectometry

Gao

Jiang

2020

PhotoniX

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This paper presents a short review for phase measuring deflectometry (PMD). PMD is a phase calculation based technique for three-dimensional (3D) measurement of specular surfaces. PMD can achieve nano-scale form measurement accuracy with the advantages of high dynamic range, non-contact, full field measurement which makes it a competitive method for specular surface measurement. With the development of computer science, display and imaging technology, there has been an advancement in speed for PMD in recent years. This paper discusses PMD focusing on the difference on its system configuration. Measurement principles, progress, advantages and problems are discussed for each category. The challenges and future development of PMD are also discussed.

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“…[11][12][13] Depending on the difference of measurement principles, the 3D shape metrology of measuring specular surfaces can be classified as contact method 14 and noncontact method. [15][16][17][18][19][20][21][22][23][24][25][26][27][28] The coordinate measurement machine (CMM) 14 is a superior choice for measuring specular surfaces by touching the measured surface and scanning along two-dimensional (2D) directions in contact method. Although CMM has the drawbacks of high cost, low speed, and scratching of the surface, 29 it is still the most widely used method for specular surface measurement because touch probes are highly accurate for dimensional inspection.…”

Section: Introductionmentioning

confidence: 99%

“…30,31 However, traditional CMMs are limited due to a lack of rotational degree of freedom, so they cannot be used for digitizing complex and free-form surfaces. 32 Interferometry [20][21][22] and deflectometry [15][16][17][18][23][24][25][26][27][28] are two competitive *Address all correspondence to Zonghua Zhang, zhzhang@hebut.edu.cn; zhzhangtju@hotmail.com methods among the noncontact measurement methods because of their high measurement accuracy and resolution. Interferometry is a technique using the phenomenon of interference to obtain distance information of simple continuous surfaces, such as planar surfaces and spheres.…”

Section: Introductionmentioning

confidence: 99%

“…PMD has been widely studied in recent years because of its advantages of large dynamic range, noncontact operation, full-field measurement, fast acquisition, high precision, and automatic data processing. [23][24][25][26][27][28] Zhang et al 34 briefly reviewed the advancements on PMD in their recent preliminary work. In this paper, we will review state-of-the-art of PMD in more detail, mainly including the basic principle of PMD, the advancements of PMD, error sources analysis of PMD, challenges, and further development.…”

Section: Introductionmentioning

confidence: 99%

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Phase measuring deflectometry for obtaining 3D shape of specular surface: a review of the state-of-the-art

et al. 2021

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Phase measuring deflectometry (PMD) is a superior technique to obtain three-dimensional (3D) shape information of specular surfaces because of its advantages of large dynamic range, noncontact operation, full-field measurement, fast acquisition, high precision, and automatic data processing. We review the recent advances on PMD. The basic principle of PMD is introduced following several PMD methods based on fringe reflection. First, a direct PMD (DPMD) method is reviewed for measuring 3D shape of specular objects having discontinuous surfaces. The DPMD method builds the direct relationship between phase and depth data, without gradient integration procedure. Second, an infrared PMD (IR-PMD) method is reviewed to measure specular objects. Because IR light is used as a light source, the IR-PMD method is insensitive to the effect of ambient light on the measured results and has high measurement accuracy. Third, a proposed method is reviewed to measure the 3D shape of partial reflective objects having discontinuous surfaces by combining fringe projection profilometry and DPMD. Then, the effects of error sources that mainly include phase error and geometric calibration error on the measurement results are analyzed, and the performance of the 3D shape measurement system is also evaluated. Finally, the future research directions of PMD are discussed.

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Posed relationship calibration with parallel mirror reflection for stereo deflectometry

Cited by 8 publications

References 19 publications

Deflectometry for specular surfaces: an overview

Deflectometry for specular surfaces: an overview

A brief review of the technological advancements of phase measuring deflectometry

Phase measuring deflectometry for obtaining 3D shape of specular surface: a review of the state-of-the-art

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