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

Jeremy D. Rogers; Tomasz T. Tkaczyk; Michael R. Descour

doi:10.1117/12.842778

24 February 2010 Foveated endoscope objective design to combine high resolution with wide field of view

Jeremy D. Rogers, Tomasz T. Tkaczyk, Michael R. Descour

Proceedings Volume 7558, Endoscopic Microscopy V; 755808 (2010) https://doi.org/10.1117/12.842778
Event: SPIE BiOS, 2010, San Francisco, California, United States

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.

Citation Download Citation

Jeremy D. Rogers, Tomasz T. Tkaczyk, and Michael R. Descour "Foveated endoscope objective design to combine high resolution with wide field of view", Proc. SPIE 7558, Endoscopic Microscopy V, 755808 (24 February 2010); https://doi.org/10.1117/12.842778

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available