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将液晶可调滤光片(LCTF)应用到真彩色多光谱图像采集中,设计了一款大面阵、高分辨率、轻小型的多光谱成像系统。系统利用LCTF空间分辨率和光谱分辨率高、波长选择灵活、调谐时间短等特点,可实现幅面大小约210 mm×148 mm,分辨率达到350 ppi的多光谱图像采集,工作谱段为420～720 nm,光谱分辨率为10 nm。结果表明,该成像系统在空间频率为91 lp/mm时,31个波段处轴上0视场和轴外1.0视场的传递函数均≥0.30,全视场畸变≤0.1%,成像质量良好,可用于大面阵、高分辨率多光谱图像的采集与分析。
The liquid crystal tunable filter (LCTF) is applied to true color multispectral image acquisition, and a large area array, high resolution, light and small multispectral imaging system is designed. The system utilizes the features of LCTF such as high spatial resolution, high spectral resolution, flexible wavelength selection and short tuning time to achieve multispectral image acquisition of about 210 mm × 148 mm format with a resolution of 350 ppi. The operating spectral band is 420 ~ 720 nm, spectral resolution of 10 nm. The results show that the transfer function of the 0-field and off-axis 1.0 fields in the 31 bands at the spatial frequency of 91 lp / mm are all ≥0.30, the total field distortion is less than or equal to 0.1% and the imaging quality is good. Can be used for large area array, high-resolution multi-spectral image acquisition and analysis.