Acta Optica Sinica, Volume. 41, Issue 23, 2331001(2021)
Design of Optical Thin-Film Filters for Multispectral Palmprint Image Acquisition Systems
Optical thin-film filters for multispectral palmprint image acquisition systems were designed. According to the different reflectance characteristics of palm skin in visible and near-infrared bands, we analyzed the spectral characteristic parameters and film design of palmprint recognition filters. For better quality of palmprint images obtained by the systems, a four-channel filter design scheme was adopted. The spectral characteristic parameters are required as follows: the central wavelengths λ1=470 nm, λ2=520 nm, λ3=630 nm, and λ4=880 nm. The full width at half maximum of each channel is 10 nm. The transmittance is higher than 90%, and the average cut-off background depth is greater than OD6 (spectral transmittance is less than 10 -6).
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Zhiqiang Yu, Shuguo Fei, Shuaifeng Zhao, Zhishuai Guo. Design of Optical Thin-Film Filters for Multispectral Palmprint Image Acquisition Systems[J]. Acta Optica Sinica, 2021, 41(23): 2331001
Category: Thin Films
Received: Apr. 29, 2021
Accepted: Jun. 11, 2021
Published Online: Nov. 1, 2021
The Author Email: Fei Shuguo (fsg@hb?sais.com)