Optical Design and Engineering

Lensless imaging for wide field of view

[+] Author Affiliations
Hajime Nagahara

Kyushu University, Faculty of Information Science and Electrical Engineering, 744 Motooka Nishiku, Fukuoka 819-0395, Japan

Yasushi Yagi

Osaka University, Institute of Scientific and Industrial Research, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan

Opt. Eng. 54(2), 025114 (Feb 23, 2015). doi:10.1117/1.OE.54.2.025114
History: Received August 23, 2014; Accepted January 14, 2015
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Abstract.  It is desirable to engineer a small camera with a wide field of view (FOV) because of current developments in the field of wearable cameras and computing products, such as action cameras and Google Glass. However, typical approaches for achieving wide FOV, such as attaching a fisheye lens and convex mirrors, require a trade-off between optics size and the FOV. We propose camera optics that achieve a wide FOV, and are at the same time small and lightweight. The proposed optics are a completely lensless and catoptric design. They contain four mirrors, two for wide viewing, and two for focusing the image on the camera sensor. The proposed optics are simple and can be simply miniaturized, since we use only mirrors for the proposed optics and the optics are not susceptible to chromatic aberration. We have implemented the prototype optics of our lensless concept. We have attached the optics to commercial charge-coupled device/complementary metal oxide semiconductor cameras and conducted experiments to evaluate the feasibility of our proposed optics.

© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Hajime Nagahara and Yasushi Yagi
"Lensless imaging for wide field of view", Opt. Eng. 54(2), 025114 (Feb 23, 2015). ; http://dx.doi.org/10.1117/1.OE.54.2.025114


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