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Title : 2-sided Lensless Sensor
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2-sided Lensless Sensor

It still remains to be seen whether lensless image sensors are able to find a market beyond the under-display fingerprint applications. Meanwhile, Tokyo Institute of Technology and Shuzuoka University propose a 2-sided version of lensless imager in a Preprint paper "Super Field-of-View Lensless Camera by Coded Image Sensors" by Tomoya Nakamura, Keiichiro Kagawa, Shiho Torashima, Masahiro Yamaguchi.

"A lensless camera is an ultra-thin computational-imaging system. Existing lensless cameras are based on the axial arrangement of an image sensor and a coding mask, and therefore, the back side of the image sensor cannot be captured. In this paper, we propose a lensless camera with a novel design that can capture the front and back sides simultaneously. The proposed camera is composed of multiple coded image sensors, which are complementary-metal-oxide-semiconductor~(CMOS) image sensors in which air holes are randomly made at some pixels by drilling processing. When the sensors are placed facing each other, the object-side sensor works as a coding mask and the other works as a sparsified image sensor. The captured image is a sparse coded image, which can be decoded computationally by using compressive-sensing-based image reconstruction. We verified the feasibility of the proposed lensless camera by simulations and experiments. The proposed thin lensless camera realizes super field-of-view imaging without lenses or coding masks, and therefore can be used for rich information sensing in confined spaces. This work also suggests a new direction in the design of CMOS image sensors in the era of computational imaging."

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