A method for phase reconstruction in optical three-dimensional shape measurement |
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| Authors: | Qiao Nao-Sheng and He Zhi |
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| Affiliation: | School of Physics and Electronics, Hunan University of Arts and Science, Changde 415000, China |
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| Abstract: | In optical three-dimensional shape measurement, a method of improving the measurement precision for phase reconstruction without phase unwrapping is analyzed in detail. Intensities of any five consecutive pixels that lie in the x-axis direction of the phase domain are given. Partial derivatives of the phase function in the x-and y-axis directions are obtained with a phaseshifting mechanism, the origin of which is analysed. Furthermore, to avoid phase unwrapping in the phase reconstruction, we derive the gradient of the phase function and perform a two-dimensional integral along the x- and y-axis directions. The reconstructed phase can be obtained directly by performing numerical integration, and thus it is of great convenience for phase reconstruction. Finally, the results of numerical simulations and practical experiments verify the correctness of the proposed method. |
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| Keywords: | phase reconstruction optical three-dimensional shape measurement measurement pre-cision |
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