Sub-pixel Layout for Super-Resolution with Images in the Octic Group

Boxin Shi^{1, 2}, Hang Zhao¹, Moshe Ben-Ezra¹, Sai-Kit Yeung², Christy Fernandez-Cull³, R. Hamilton Shepard³, Christopher Barsi¹, and Ramesh Raskar¹

¹MIT Media Lab, Cambridge, MA, USA

²Singapore University of Technology and Design, Singapore

³MIT Lincoln Lab, Lexington, MA, USA

Abstract. This paper presents a novel super-resolution framework by exploring the properties of non-conventional pixel layouts and shapes. We show that recording multiple images, transformed in the octic group, with a sensor of asymmetric sub-pixel layout increases the spatial sampling compared to a conventional sensor with a rectilinear grid of pixels and hence increases the image resolution. We further prove a theoretical bound for achieving well-posed super-resolution with a designated magnification factor w.r.t. the number and distribution of sub-pixels. We also propose strategies for selecting good sub-pixel layouts and effective super-resolution algorithms for our setup. The experimental results validate the proposed theory and solution, which have the potential to guide the future CCD layout design with super-resolution functionality.

Keywords: Super-resolution, CCD sensor, Sub-pixel layout, Octic group

LNCS 8689, p. 250 ff.

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