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
- Acta Optica Sinica
- Vol. 41, Issue 23, 2331001 (2021)
Fig. 1. Schematic of palm print acquisition equipment
Fig. 2. Spectral curves of four LED light sources
Fig. 3. Quantum efficiency curve of CCD camera
Fig. 4. A-plane transmittance curve
Fig. 5. Cut-off depth curve of A-plane
Fig. 6. Cut-off depth curve of B-plane
Fig. 7. Spectral curves after optimized superposition. (a) Double-sided cut-off depth curves; (b) transmittance curve of 520 nm filter; (c) cut-off depth curve of 520 nm filter
Fig. 8. Spectral curve of transmittance of four-channel filter
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Table 1. Spectral characteristic parameters
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Table 2. Specific film indexes of 470 nm, 630 nm, and 880 nm filters
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Table 3. Spectral performance index of four channel filter
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