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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 27, Iss. 10 — Oct. 1, 2010
  • pp: 2304–2312

Upscaling image resolution of compact imaging systems using wavefront coding and a property of the point-spread function

Sang-Hyuck Lee, No-Cheol Park, Kyoung-Su Park, and Young-Pil Park  »View Author Affiliations


JOSA A, Vol. 27, Issue 10, pp. 2304-2312 (2010)
http://dx.doi.org/10.1364/JOSAA.27.002304


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Abstract

We propose an image-resolution upscaling method for compact imaging systems. The image resolution is calculated using the resolving power of the optics and the pixel size of a digital image sensor. The resolution limit of the compact imaging system comes from its size and the number of allowed lenses. To upscale the image resolution but maintain the small size, we apply wavefront coding and image restoration. Conventional image restoration could not enhance the image resolution of the sensor. Here, we use the upscaled image of a wavefront-coded optical system and apply an image-restoration algorithm using a more precisely calculated point-spread function (PSF) as the deconvolution filter. An example of a wavefront-coded optical system with a 5 -megapixel image sensor is given. The final image had a resolution equivalent to that of a 10 -megapixel image using only four plastic lenses. Moreover, image degradation caused by hand motion could also be reduced using the proposed method.

© 2010 Optical Society of America

OCIS Codes
(080.3620) Geometric optics : Lens system design
(110.0110) Imaging systems : Imaging systems
(110.3010) Imaging systems : Image reconstruction techniques

ToC Category:
Imaging Systems

History
Original Manuscript: June 24, 2010
Revised Manuscript: August 26, 2010
Manuscript Accepted: August 26, 2010
Published: September 28, 2010

Virtual Issues
Vol. 5, Iss. 14 Virtual Journal for Biomedical Optics

Citation
Sang-Hyuck Lee, No-Cheol Park, Kyoung-Su Park, and Young-Pil Park, "Upscaling image resolution of compact imaging systems using wavefront coding and a property of the point-spread function," J. Opt. Soc. Am. A 27, 2304-2312 (2010)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-27-10-2304

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