Circular fringe projection profilometry

Author: qtkm

August undefined, 2024

WebSep 21, 2014 · Abstract 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. WebIn fringe projection profilometry (FPP) based on temporal phase unwrapping (TPU), reducing the number of projecting patterns has become one of the most important works in recent years. To remove the $2\pi $ ambiguity independently, this paper proposes a TPU method …

Three-dimensional measurement based on optimized circular fringe ...

WebPhase demodulation is an essential image processing stage required by digital fringe projection profilometers. Currently, several approaches for phase demodulation have been proposed. In this work, a set of phase demodulation methods useful for digital fringe projection profilometry is presented. WebAug 1, 2024 · Fringe projection profilometry is widely used for three-dimensional (3D) measurements. System calibration is crucial to fringe projection systems, since it … inch and miles: the journey to success

Temporal Phase Unwrapping Based on Unequal Phase-Shifting Code

WebMay 15, 2024 · We report that fringe projection profilometry is a well-established technique for optical 3D shape measurement. However, in many applications, it is desirable to make 3D measurements at very high speed, especially with fast moving or shape changing objects. In this work, we demonstrate a new 3D dynamic imaging technique, … WebAug 12, 2024 · Circular fringe projection profilometry (CFPP), as a branch of carrier fringe projection profilometry, has attracted research interest in recent years. Circular fringe Fourier transform profilometry (CFFTP) has been used to measure out-of-plane objects quickly because the absolute phase can be obtai … WebIn fringe projection profilometry, high-order harmonics information of distorted fringe will lead to errors in the phase estimation. In order to solve this problem, a point-wise phase estimation method based on a neural network (PWPE-NN) is proposed in this paper. The complex nonlinear mapping relationship between the gray values and the phase under … inch and millimeter

An Improved Circular Fringe Fourier Transform Profilometry

Spatial and temporal methods for fringe pattern analysis: a review

WebCircular fringe projection profilometry (CFPP), as a branch of carrier fringe projection profilometry, has attracted research interest in recent years. Circular fringe Fourier transform profilometry (CFFTP) has been used to measure out-of-plane objects quickly because the absolute phase can be obtained by employing fewer fringes. However, the … income tax e filing exampleWebMar 1, 2024 · In this paper, based on the extended epipolar geometry, we propose circular fringe projection profilometry to overcome the direction issue without doubling the … inch and millimeter ruler

"WebAbstract In fringe projection profilometry (FPP), temporal phase unwrapping is an essential procedure to recover an unambiguous absolute phase even in the presence of large discontinuities or spatially isolated surfaces. So far, there are typically three groups of temporal phase unwrapping algorithms proposed in the literature: multi-frequency … " - Circular fringe projection profilometry

Circular fringe projection profilometry

Three-dimensional measurement based on optimized circular fringe ...

WebAug 12, 2024 · Fringe projection profilometry (FPP), as a common active optical three-dimensional (3D) measurement technology, has advantages of high-precision, non … WebJan 1, 2016 · A projector with small field of view (FOV) is applied to achieve a full 3D reconstruction in our profilometry system. Experiments with a prototype demonstrate the validation and accuracy of the proposed calibration algorithm and system configuration.

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WebJun 1, 2024 · Fringe projection profilometry (FPP) [1] is an important three-dimensional (3D) measurement technique with the advantages of noncontact, high accuracy, high speed, and simple instrumentation;... WebFeb 4, 2024 · Circular fringe projection profilometry (CFPP) is a recently proposed optical three-dimensional (3D) measurement technique. Theoretically, its optimal measurement accuracy should precede that of the conventional fringe projection profilometry. In practice, the measurement accuracy is impacted by many factors, and …

WebOct 1, 2024 · Fringe projection techniques for 3D shape measurement usually employ linear fringes. • This method has a limit on measurable whole plane displacement. • New … WebMay 6, 2024 · Fig. 1. Fringe projection profilometry system. Full size image. The details of our experimental set-up are as following: the optical centers of camera and projector are located at the same distance from the reference plane; the optical axes of the camera and projector are coplanar; and the optical axis of camera is vertical to reference plane.

WebApr 6, 2024 · Abstract Fringe projection profilometry is widely used in different areas; it has the benefit of retrieving full-field height information from a single or multiple fringe patterns with high... WebNov 1, 2016 · In this Letter, a novel three-dimensional (3D) measurement method, called the circular fringe projection profilometry (CFPP), is proposed. Similar to the conventional …

WebJan 9, 2024 · State-of-the-art high-accuracy three-dimensional (3D) profilometry systems typically use a lens with a fixed focal length, making it difficult for them to measure scenes with large depth variations, especially dynamically changing ones. To address this need, this Letter proposes a novel, to the best of our knowledge, autofocusing method for high …

WebIn phase-shifting fringe projection profilometry, the projector nonlinearity has been recognized as one of the main error-inducing factors, especially when only very few fringe patterns are available. For solving this issue, this paper presents a simple and effective method, that allows us to recognize and remove, directly from a calculated ... income tax e filing excel utility ay 2021-22WebOct 26, 2024 · Discussion on accurate phase–height mapping in fringe projection profilometry. Abstract. Establishing a highly accurate phase-to-height mapping … income tax e filing form 16 pdfWebTemporal phase-unwrapping methods for fringe projection profilometry, mainly represented by the multi-frequency and multi-wavelength classes, are fundamental to recovering the 3D information from the continuous phase, also allowing measure discontinuities and isolated objects. In this paper, it is proposed a temporal phase … inch and mmWebCircular fringe Fourier transform profilometry (CFFTP) based on a triangulation system has the capability of whole out-of-plane measurement using fewer fringes. To the best of … inch and ouncesWebSep 6, 2024 · Circular fringe projection profilometry (CFPP) is a special kind of FPP with telecentric lenses [35–37]. The specialty lies in that CFPP recovers the 3D profile based … income tax e filing for salaried personWeb期刊：Eighth Symposium on Novel Photoelectronic Detection Technology and Applications文献作者：Pengxu Zhou; Huikai Zhong; Cheng Gui; Yanjun Fu出版日期： ... Microscopic fringe projection profilometry system calibration based … income tax e filing freeWebMar 1, 2024 · In this paper, based on the extended epipolar geometry, we propose circular fringe projection profilometry to overcome the direction issue without doubling the number of patterns. First, by introducing the farthest and nearest points to the epipole in projector space, we can robustly control the spatial frequency of circular fringes in patterns. income tax e filing home page govt of india