Lensless cameras have recently emerged as a compact imaging system based on computational imaging with various multiplexing capabilities. Here, we propose a compact and low-cost lensless camera that enables snapshot full-Stokes polarization imaging. While polarization imaging provides additional contrast based on the birefringence and surface properties of the object, most polarization cameras require bulky hardware or are limited to measuring only the linear polarization information. Our device, composed of a phase mask, a polarization-encoded aperture, and a regular image sensor, performs compressed imaging to recover linear as well as circular polarization information of the scene from single image capture. We demonstrate the full-Stokes imaging capabilities of our device and describe the image reconstruction and calibration processes.
Lensless cameras are a novel class of computational imaging devices, in
which the lenses are replaced with a thin mask to achieve
ultra-compact and low-cost hardware. In this paper, we propose a
method for high-throughput fabrication of lensless cameras designed
with arbitrary point spread functions (PSFs) for various imaging
tasks. The workflow of our method includes designing the smooth phase
mask profiles for a given PSF pattern and then fabricating the mask in
a single shot via the gray-scale lithography technique. Compared to
the existing approaches, our combined workflow allows an ultra-fast
and cost-effective fabrication of phase masks and is suitable for mass
production and commercialization of lensless cameras. We show that our
method can be used for a flexible production of custom lensless
cameras with various pre-designed PSFs and effectively obtain images
of the scene via computational image reconstruction. Finally, we
discuss and demonstrate the future directions and the potential
applications of our custom lensless cameras, including the deployment
of the learned reconstruction networks for fast imaging and
fingerprint detection via optical template matching.
We present a design and construction of a lensless camera where the phase-modulating mask is integrated directly on a sensor using the UV-imprint lithography. Our method delivers a rigid device with a small form-factor.
We report on the construction of a lensless camera with a phase-modulating mask layer integrated directly on an image sensor using the UV-imprint lithography method. By replicating the master phase mask's surface structure directly on the image sensor, our method further simplifies the fabrication of lensless cameras and delivers a rigid and durable device with a small form factor. Our prototype device has an open-faced design without any apertures and generates high-quality photographic reconstructions with high light collection efficiency. We analyze the performance of our prototype device and demonstrate various imaging applications, including the digital refocusing capabilities.
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