Single-snapshot 2D color measurement by plenoptic imaging system
2014
Plenoptic cameras enable capture of directional light ray information, thus allowing applications such as digital
refocusing, depth estimation, or multiband imaging. One of the most common plenoptic camera architectures contains a
microlens array at the conventional image plane and a sensor at the back focal plane of the microlens array. We leverage
the multiband imaging (MBI) function of this camera and develop a single-snapshot, single-sensor high color fidelity
camera. Our camera is based on a plenoptic system with XYZ filters inserted in the pupil plane of the main lens. To
achieve high color measurement precision of this system, we perform an end-to-end optimization of the system model
that includes light source information, object information, optical system information, plenoptic image processing and
color estimation processing. Optimized system characteristics are exploited to build an XYZ plenoptic colorimetric
camera prototype that achieves high color measurement precision. We describe an application of our colorimetric camera
to color shading evaluation of display and show that it achieves color accuracy of ΔE<0.01.
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