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Proceedings Paper

Angle-sensitive pixels: a new paradigm for low-power, low-cost 2D and 3D sensing
Author(s): Albert Wang; Sheila S. Hemami; Alyosha Molnar
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Paper Abstract

Angle-sensitive pixels are micro-scale devices which capture information about both the intensity and incident angle of the light they see. These pixels acquire a richer description of incident light that conventional intensity-sensitive pixels. We provide a mathematical framework for analyzing the imaging capability of these pixels and demonstrate that they provide a response similar to one component of a 2D Hartley transform in angle, with a distinct frequency and orientation. By using several kinds of different pixels throughout an image sensor, we obtain a full, low-order Hartley transform of local angle, which is mapped to a local, spatial Hartley transform by a conventional camera lens. Based on these principles, we demonstrate a light-field camera using an image sensor composed of angle-sensitive pixels and a conventional camera lens. Single images captured by our camera can be directly used for both computational refocus for enhanced depth of field and depth map generation. The algorithms used for these tasks are simple and take advantage of the transform-based nature of angle-sensitive pixel based image capture.

Paper Details

Date Published: 21 February 2012
PDF: 13 pages
Proc. SPIE 8288, Stereoscopic Displays and Applications XXIII, 828805 (21 February 2012); doi: 10.1117/12.910240
Show Author Affiliations
Albert Wang, Cornell Univ. (United States)
Sheila S. Hemami, Cornell Univ. (United States)
Alyosha Molnar, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 8288:
Stereoscopic Displays and Applications XXIII
Andrew J. Woods; Nicolas S. Holliman; Gregg E. Favalora, Editor(s)

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