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Proceedings Paper

Foveated endoscope objective design to combine high resolution with wide field of view
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Paper Abstract

There is always a tradeoff between resolution and Field of View (FOV) in an imaging system. This limit can be due to the number of pixels in the detector, however a fundamental limit also exists in any optical system called the Space Bandwidth Product (SBP) which scales as the FOV area divided by the area of the diffraction limited spot. The SBP can only be increased by increasing the size of the optical system. In applications where the size of the optical system is constrained such as endoscopes, the SBC will ultimately limit the resolution or FOV. However, there is a way to provide both high resolution and a wide FOV without changing the total number of pixels in the image. The technique is called foveated imaging because is mimics this characteristic of the human eye in which the fovea has a higher resolution at the center of the FOV than the surrounding retina. A similar effect can be achieved optically by introducing a large amount of barrel distortion in the lens design. The result is an effective increase in the magnification at the center of the FOV, and reduced resolution but larger angular sampling at the edge. The stretching effect of the distortion can be compensated for computationally to provide an onscreen display that is not distorted, but merely appears blurred at the edges. Such an objective will enable for endomicroscopy while still providing "peripheral vision" to allow endoscopists to navigate and locate regions of interest.

Paper Details

Date Published: 24 February 2010
PDF: 4 pages
Proc. SPIE 7558, Endoscopic Microscopy V, 755808 (24 February 2010); doi: 10.1117/12.842778
Show Author Affiliations
Jeremy D. Rogers, Northwestern Univ. (United States)
Tomasz T. Tkaczyk, Rice Univ. (United States)
Michael R. Descour, Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 7558:
Endoscopic Microscopy V
Guillermo J. Tearney; Thomas D. Wang, Editor(s)

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