Analytical comparison of predetection, postdetection, and hybrid image compensation techniques in the presence of atmospheric turbulence

Susan P. Hagerty; James M. Young; Cynthia S. Peck; James N. Tilley III

doi:10.1117/12.177727

1 June 1994 Analytical comparison of predetection, postdetection, and hybrid image compensation techniques in the presence of atmospheric turbulence

Susan P. Hagerty, James M. Young, Cynthia S. Peck, James N. Tilley III

Author Affiliations +

Proceedings Volume 2238, Hybrid Image and Signal Processing IV; (1994) https://doi.org/10.1117/12.177727
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

Images obtained from ground-based telescopes are distorted due to the effects of atmospheric turbulence. This disturbance can be compensated for by employing adaptive optics (predetection compensation), image reconstruction techniques (postdetection compensation), or a combination of both (hybrid compensation). This study derives analytic expressions for the residual mean squared error of each technique. These mean squared error expressions are then used to parametrically evaluate the performance of the compensated imaging techniques under varying conditions. Parameters of interest include actuator spacing, coherence length, and wavefront sensor noise variance. It is shown that hybrid imaging allows for the design of lower cost systems (fewer actuators) that still provide good correction. The adaptive optics system modeled includes a continuous faceplate deformable mirror and a Hartmann Shack wavefront sensor. The linear image reconstruction technique modeled is deconvolution via inverse filtering. The hybrid system employs the adaptive optics for first order correction and the image reconstruction for higher order correction. This approach is not limited to correction of atmospheric turbulence degraded images. It can be applied to other disturbances, such as space platform jitter, as long as the corresponding structure function can be estimated.

Citation Download Citation

Susan P. Hagerty, James M. Young, Cynthia S. Peck, and James N. Tilley III "Analytical comparison of predetection, postdetection, and hybrid image compensation techniques in the presence of atmospheric turbulence", Proc. SPIE 2238, Hybrid Image and Signal Processing IV, (1 June 1994); https://doi.org/10.1117/12.177727

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
11 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Actuators

Wavefronts

Error analysis

Imaging systems

Adaptive optics

Wavefront sensors

Lanthanum

Show All Keywords

Keywords/Phrases

Search In:

Publication Years