Papers by Keyword: 3D Shape Measurement

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Authors: Liang Zhou Chen, Dan Qu, Li Ping Zhou, Jiang Hong Gan
Abstract: A new method of actualizing grating non-diffracting structured light (GNSL) is proposed. The GNSL holds characters of long focal-depth, narrow strip-width, steady light field and constant light intensity in certain rang etc. Based on precise triangular-section prism, an optical system is designed and actualized experimentally. With theory analysis and calculation to the optical system, the distribution of the light intensity is simulated in non-diffracting range. Experiment results show that simulation is in good agreement with the theory calculation. According to system parameters, GNSL with 18um strip-width and 57cm non-diffracting range is produced in experimental system. Compared with traditional projected light source, GNSL has advantages of high resolution and high precision in the application of three dimensions (3D) shape measurement. By using GNSL, matching ambiguity could be reduced.
Authors: Wen Guo Li, Shao Jun Duan
Abstract: We present a convenient calibration method for structured light projection system. The proposed clibration approach can realize 3D shape measurement without projector calibration, without system calibration, without precise linear z stage to be used, the relative position between camera and projector can be arbitrary, and the only involved device is a plane board. Experiment results validated that the accuracy of the proposed approach.
Authors: Wen Guo Li, Shao Jun Duan
Abstract: A phase unwrapping algorithm for 3D shape measurement of discontinous surface is presented. The proposed phase unwrapping algorithm can overcome the phase discontinuous problem.Three channel values in HSV space are completely employed to calculate the pattern color information intensity, the relative position relationship between adjacent pixels hue channel value is used to decide absolute phase fringe order. The proposed unwrapping algorithm can be applied to the measurement for 3d object with large height steps and/or spatially isolated surfaces. The correctness of the proposed algorithm is validated by our simulated experiment.
Authors: Huan Don
Abstract: In this paper, we present an optical profilometric technique for 3D shape measurement--Fourier Transform Profilometry (FTP). In contrast to other optical techniques, the grating pattern will in its spatial frequency fields as well as in its space-signal fields which projected onto the object surface and was Fourier-transformed and processed. This technique only requires a single fringe pattern up to no more than two to reproduce 3D object shape. FTP has a much higher sensitivity to the fringe quality than other techniques. We design a system which has a high-resolution system composed of a video projector and a digital camera. A fringe pattern of programming by computer is projected onto the free surface and its diagram is recorded by the camera. The deformed fringe pattern arising from the surface deformations is later compared to the unreformed (reference) one, leading to a phase map from which the free surface can be reconstructed after some series of processes.
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