Imec has developed a process for the monolithic integration of optical filters on top of CMOS image sensors, leading to compact, cost-efficient and faster hyperspectral cameras that make the technology attractive for industry. To calibrate the sensor, we introduce a full pixel response model that takes into account the inherent properties of the optical filters. This model is then used to derive a calibration method that enables more accurate and robust measurements of the spectral reflectance of a scene. The calibration method is then extended to take into account the normal manufacturing variations between different sensors to perform an inter-sensor calibration. We experimentally validate this method by scanning reference targets with different types of sensors and demonstrate that accurate and reproducible reflectance measurements are obtained.
Julien Pichette, Thomas Goossens, Kathleen Vunckx, and Andy Lambrechts, "Hyperspectral calibration method For CMOS-based hyperspectral sensors," Proc. SPIE 10110, Photonic Instrumentation Engineering IV, 101100H (Presented at SPIE OPTO: February 01, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2253617.
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