Fringe projection thesis

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By downloading any item s listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms. Image processing -- Digital techniques. Diffraction patterns. It has salient advantages of low cost, high resolution, fast data acquisition, and full-field measurement as compared to other existing 3D scanning approaches. This thesis focuses on the development of robust FPP methods for obtaining accurate 3D estimation of the objects from incomplete or degraded observations due to the interference in the working environment. In a practical FPP procedure, some parts of the fringe images can be masked by the highlights generated due to the reflection of the surrounding global illuminations.
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No document with DOI "10.1.1.886.3305"

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Investigation of accurate fringe analysis techniques for fringe projection profilometry | DR-NTU

Investigation of accurate fringe analysis techniques for fringe projection profilometry. Fringe pattern analysis FPA is an important aspect of all optical measurement techniques. Fringe patterns are usually generated by a well-known phenomenon of optical interference. The surface of an object is then, reconstructed by analyzing the phase distribution of these fringe patterns- a process called phase extraction. To analyze the phase distributions in both spatial and spectral domains, pixel-wise phase shifting and global Fourier transform have been established as the two pillar techniques for fringe analysis. To use both the properties simultaneously, Windowed Fourier Transform WFT has emerged as an in-between technique to analyze the fringe patterns block by block.
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Smaller objects reconstruction using three-dimensional techniques is one among the challenging tasks from the decade. Researchers in graphical designing and professionals of photography are continuously working on the reconstruction of 3D object techniques to meet the demand of real-time applications of almost all in every walk of real life. Reconstruction of 3D objects has a major role in the reverse engineering applications too. The major challenges in successful 3D object reconstruction are high computational costs and lack of accuracy. Fringe projection has come into view as a propitious 3D reconstruction mechanism with low computational cost for high precision and resolutions.
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