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17 May 2019 Detection of optical fringes parameters with global direction metric
Yuexin Wang, Jiayi Chen, Sheng Liu, Fuzhong Bai
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Proceedings Volume 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019); 111700W (2019) https://doi.org/10.1117/12.2532558
Event: Fourteenth National Conference on Laser Technology and Optoelectronics, 2019, Shanghai, China
Abstract
A global direction metric method based on Fourier-polar transform is proposed in this paper, which calculates the global fringe direction according to the directional distribution of intensity from the power spectrum of fringe pattern. By introducing polar coordinate transform, the rotation of power spectrum is transformed into translation component, which can make the calculation process simple and fast. Then the original image is projected along the global fringe direction and the mean value of pixel gray is calculated. Also, the fringe pitch can be calculated from the projection curve close to cosine distribution. This detection method of optical fringe parameters uses overall information of the image, and holds good adaptability and robustness to noise and degraded image. Moreover, without any pre-processing operations such as smoothing filter and threshold segmentation is required in this method. It can directly detect two parameters of global fringe direction and fringe spacing, which is of great significance for quantitative analysis of fringe image.
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Yuexin Wang, Jiayi Chen, Sheng Liu, and Fuzhong Bai "Detection of optical fringes parameters with global direction metric", Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 111700W (17 May 2019); https://doi.org/10.1117/12.2532558
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KEYWORDS
Fringe analysis
Fourier transforms
Radon transform
Quantitative analysis
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