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Proceedings Paper

Imaging with depth extension: where are the limits in fixed-focus cameras?
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Paper Abstract

The integration of novel optics designs, miniature CMOS sensors, and powerful digital processing into a single imaging module package is driving progress in handset camera systems in terms of performance, size (thinness) and cost. The miniature cameras incorporating high resolution sensors and fixed-focus Extended Depth of Field (EDOF) optics allow close-range reading of printed material (barcode patterns, business cards), while providing high quality imaging in more traditional applications. These cameras incorporate modified optics and digital processing to recover the soft-focus images and restore sharpness over a wide range of object distances. The effects a variety of parameters of the imaging module on the EDOF range were analyzed for a family of high resolution CMOS modules. The parameters include various optical properties of the imaging lens, and the characteristics of the sensor. The extension factors for the EDOF imaging module were defined in terms of an improved absolute resolution in object space while maintaining focus at infinity. This definition was applied for the purpose of identifying the minimally resolvable object details in mobile cameras with bar-code reading feature.

Paper Details

Date Published: 11 September 2008
PDF: 10 pages
Proc. SPIE 7061, Novel Optical Systems Design and Optimization XI, 706106 (11 September 2008); doi: 10.1117/12.795664
Show Author Affiliations
Dmitry Bakin, Micron Technology Inc. (United States)
Brian Keelan, Micron Technology Inc. (United States)


Published in SPIE Proceedings Vol. 7061:
Novel Optical Systems Design and Optimization XI
R. John Koshel; G. Groot Gregory; James D. Moore; David H. Krevor, Editor(s)

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