A comparison study of digital sinusoidal fringe generation technique: defocusing binary patterns VS focusing sinusoidal patterns

Lei, Shuangyan

doi:10.31274/etd-180810-724

Cited by 2 publications

(3 citation statements)

References 43 publications

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“…The introduction of binary fringes has largely compensated for the influence of the limited DOF of the camera lens. Lei et al [10][11][12] compared the potential errors for defocusing binary patterns (DBP) and focusing sinusoidal patterns (FSP) and proposed approximating the sinusoidal fringes by a defocused Ronchi-like binary pattern. The degree of defocusing was modeled by the breadth of the point-spread function of the system.…”

Section: Introductionmentioning

confidence: 99%

“…The introduction of binary fringes has largely compensated for the infl of the limited DOF of the camera lens. Lei et al [10][11][12] compared the potential erro defocusing binary patterns (DBP) and focusing sinusoidal patterns (FSP) and pro approximating the sinusoidal fringes by a defocused Ronchi-like binary pattern. T gree of defocusing was modeled by the breadth of the point-spread function of the sy Niu et al [13] proposed an advanced PMD method by using a bi-telecentric lens built up the direct relationship between depth and absolute phase after calibratin realized the measurement of complex specular objects with discontinuous surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Aided Imaging Phase Measuring Deflectometry Based on Concave Focusing Mirror

Gao

Meng

et al. 2023

Photonics

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With the rapid development of aerospace, high-speed train, and automotive industries, the demand for the measurement of high-precision specular components is increasing. The acquisition of high-precision three-dimensional (3D) data is conducive to improving the performance of and extending the service life of these components. However, the existing 3D measurement methods of specular surfaces are affected by the inherent limitation of the depth of field (DOF) of camera lenses. Based on the principle of paraxial reflection imaging of a concave mirror, this paper introduces a concave mirror into a phase measuring deflectometry (PMD) system and proposes an aided imaging PMD (AIPMD) based on a concave focusing mirror. The proposed system realizes the clear imaging of the encoded patterns and the surface under test in the DOF of the camera lens, simultaneously. Meanwhile, the iterative coefficient specular reconstruction algorithm is studied based on this system. The feasibility and accuracy of the proposed method are verified by simulations and experiments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aided Imaging Phase Measuring Deflectometry Based on Concave Focusing Mirror

Gao

Meng

et al. 2023

Photonics

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“…SLS have recently proliferated in industrial metrology, because they do not contact the object being measured and thus can be used with final-stage products; they operate much faster than standard contact coordinate measuring machines 3 and provide a more complete measurement as they acquire a large number of measurement points simultaneously. Fringe projection techniques 4,5 are a category of SLS where either continuous [6][7][8] (usually sinusoidal) or binary fringes 6,9,10 are projected on an object and images are taken at an angle in order to extract three-dimensional (3-D) topography information about the object. For the fringe projection technique to operate efficiently and for the system to have adequate depth resolution, the camera and projector must be noncollinear.…”

Section: Introductionmentioning

confidence: 99%

Flexible decoupled camera and projector fringe projection system using inertial sensors

et al. 2017

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, "Flexible decoupled camera and projector fringe projection system using inertial sensors," Opt. Eng. Abstract. Measurement of objects with complex geometry and many self-occlusions is increasingly important in many fields, including additive manufacturing. In a fringe projection system, the camera and the projector cannot move independently with respect to each other, which limits the ability of the system to overcome object selfocclusions. We demonstrate a fringe projection setup where the camera can move independently with respect to the projector, thus minimizing the effects of self-occlusion. The angular motion of the camera is tracked and recalibrated using an on-board inertial angular sensor, which can additionally perform automated point cloud registration.

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A comparison study of digital sinusoidal fringe generation technique: defocusing binary patterns VS focusing sinusoidal patterns

Cited by 2 publications

References 43 publications

Aided Imaging Phase Measuring Deflectometry Based on Concave Focusing Mirror

Aided Imaging Phase Measuring Deflectometry Based on Concave Focusing Mirror

Flexible decoupled camera and projector fringe projection system using inertial sensors

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