Spectral Reflectance Estimation Using Projector with Unknown Spectral Power Distribution
Spectral Reflectance Estimation Using Projector with Unknown Spectral Power Distribution
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DOI：
10.2352/issn.2169-2629.2020.28.32
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
Hironori Hidaka;Yusuke Monno;M. Okutomi
中科院分区：
文献类型：
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作者：
Hironori Hidaka;Yusuke Monno;M. Okutomi
基于照明的多光谱成像系统是一种基于RGB相机和投影仪的多光谱成像系统，是获取多光谱观测数据以估计场景光谱反射率信息的最实用和低成本的系统之一。然而，现有的基于投影机的系统假设每个投影机的光谱功率分布（SPD）是已知的，这需要额外的设备，如光谱仪来测量SPD。本文提出了一种联合估计每个投影机原片的光谱反射率和SPD的方法。除了采用常用的光谱反射率基模型外，我们还利用新采集的投影机SPD数据库得到的基函数，建立了投影机SPD的低维模型。然后，根据基模型交替估计光谱反射率和投影仪的spd。我们通过实验证明了使用不同数量的投影照明的联合估计的性能，并研究了使用未知SPD的投影仪进行光谱反射率估计的潜力。
A lighting-based multispectral imaging system using an RGB camera and a projector is one of the most practical and low-cost systems to acquire multispectral observations for estimating the scene's spectral reflectance information. However, existing projector-based systems assume that the spectral power distribution (SPD) of each projector primary is known, which requires additional equipment such as a spectrometer to measure the SPD. In this paper, we present a method for jointly estimating the spectral reflectance and the SPD of each projector primary. In addition to adopting a common spectral reflectance basis model, we model the projector's SPD by a low-dimensional model using basis functions obtained by a newly collected projector's SPD database. Then, the spectral reflectances and the projector's SPDs are alternatively estimated based on the basis models. We experimentally show the performance of our joint estimation using a different number of projected illuminations and investigate the potential of the spectral reflectance estimation using a projector with unknown SPD.