Mr. Guangyi Xiao Profile

Guangyi Xiao

at Hunan Univ

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Publications (2)

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Proceedings Article | 12 March 2021 Paper

Fabrication of spectral differential four channel microfiltration array

Guang-yi Xiao, Huan Zhang, Xiao-li Xie, Sheng-li Chang, Jing-yue Fang

Proceedings Volume 11763, 117631Q (2021) https://doi.org/10.1117/12.2586298

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A microfilter array based on the principle of spectral difference is prepared to improve the signal-to-noise ratio by eliminating the background. Based on the design of Fabry-Perot periodic multilayer medium film, the narrow-band filter with the central wavelength of 589nm, the bandwidth is about 3.2nm, the transmittance is 60%, and cutoff OD3 was prepared. A filter array with unit size of 11 μm × 11 μm and size of 2048×2048 was prepared by pixelating the optical narrow-band interference film by ultraviolet lithography and reactive ion etching. The microregion of filter array is measured by fiber optic spectrometer and atomic force microscope. The results show that the filter array is accurate and effective for the regulation of Fabry-Perot cavity, and the filter periodic structure of 2×2 is realized.

Proceedings Article | 5 November 2020 Paper

License plate photo recognition technology based on micro-nano filter

Ziling Chen, Jianping Zeng, Guangyi Xiao, Xiaoli Xie, Jingyue Fang

Proceedings Volume 11567, 1156735 (2020) https://doi.org/10.1117/12.2580091

KEYWORDS: Optical filters, Light sources, Image filtering, Image processing, Image segmentation, Light

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In the process of the license plate photo recognition process, light and external environment are important factors for the clarity of the photo result. We first add a 400nm filter in front of the camera to carry out the experiment, take pictures with ultraviolet rays light and without ultraviolet rays light source irradiation, then add a 390nm filter in front of the camera to perform the same experiment for comparison. Perform comparative analysis and image processing on the experimental shooting results. First, it can be seen from the comparison of the shooting results that the clarity and recognition of the image under the action of the 400nm filter are significantly improved compared with that of the 390nm filter. Second, the image processing is used to analyze the results, which can effectively identify the license plate information. Finally, the license plate is irradiated with micro-nano filter and ultraviolet light source instead of the monitor fill light, so the strong light stimulation to the driver's eyes is avoided, thereby alleviating the short-term ‘light blindness’ phenomenon of the human eyes and reducing the hidden safety hazards when driving.

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