Sheared-beam imaging in the presence of space-time distortions

Barbara Tehan Landesman; David F. Olson

doi:10.1117/12.188045

30 September 1994 Sheared-beam imaging in the presence of space-time distortions

Barbara Tehan Landesman, David F. Olson

Proceedings Volume 2302, Image Reconstruction and Restoration; (1994) https://doi.org/10.1117/12.188045
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

In sheared beam imaging, a target is coherently illuminated with three sheared and modulated beams. Both target motion and the temporal distribution of the laser illumination affect image recovery. Movement of the target will cause a corresponding motion of the target's speckle pattern on the ground. As the speckle pattern travels across the detector, each integration period, or bin, in a single laser pulse, or frame, will record a slightly different speckle distribution. This phenomenon effects a smearing of the speckle formation from bin to bin within a single frame, and subsequently degrades the recovered image. Image recovery is further complicated by temporally nonuniform illumination. Both smearing and nonuniform pulse shapes create distortions in the spatial and temporal distributions of the speckle patterns that garble image recovery. This paper documents the derivation of the governing equations for the simulation of sheared beam imaging in the presence of these space-time distortions. In addition, we present algorithms for alleviating these distortions prior to image reconstruction. We conclude with simulation results showing the effect of the space-time distortions on sheared beam image recovery and the improvement achieved with the post-detection deblurring and pulse correction algorithms.

Citation Download Citation

Barbara Tehan Landesman and David F. Olson "Sheared-beam imaging in the presence of space-time distortions", Proc. SPIE 2302, Image Reconstruction and Restoration, (30 September 1994); https://doi.org/10.1117/12.188045

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