Programmable Spectral Filter Arrays for Hyperspectral Imaging

• URL: http://arxiv.org/abs/2109.14450v1
• Date: Wed, 29 Sep 2021 14:30:55 GMT
• Title: Programmable Spectral Filter Arrays for Hyperspectral Imaging
• Authors: Aswin C. Sankaranarayanan, Vishwanath Saragadam, Vijay Rengarajan, Ryuichi Tadano, Tuo Zhuang, Hideki Oyaizu, Jun Murayama
• Abstract summary: Modulating the spectral dimension of light has numerous applications in computational dimension imaging. This paper provides an optical design for implementing such a capability. We show a number of unique operating points with our prototype including single- and multi-image hyperspectral imaging.
• Score: 23.742208436405534
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Modulating the spectral dimension of light has numerous applications in computational imaging. While there are many techniques for achieving this, there are few, if any, for implementing a spatially-varying and programmable spectral filter. This paper provides an optical design for implementing such a capability. Our key insight is that spatially-varying spectral modulation can be implemented using a liquid crystal spatial light modulator since it provides an array of liquid crystal cells, each of which can be purposed to act as a programmable spectral filter array. Relying on this insight, we provide an optical schematic and an associated lab prototype for realizing the capability, as well as address the associated challenges at implementation using optical and computational innovations. We show a number of unique operating points with our prototype including single- and multi-image hyperspectral imaging, as well as its application in material identification.

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