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23 August 2005Derivation and application of an anisoplanatic optical transfer function for blind deconvolution of laser radar imagery
Considerable tactical utility is anticipated for systems that
coherently illuminate remote target scenes to form detailed images
over long, turbulent optical paths through wide FOV optical
components. Typical viewing conditions greatly exceed the
isoplanatic angle, and isoplanatic patch sizes approach the area
of individual pixels on the imaging array. Although adaptive
optical systems have met limited success in the restoration of
anisoplanatically formed images, such hardware is unsuitable for
tactical applications, and requires multiple point-source imagery
to adapt the optical system to the turbulence. Our previous work
demonstrated a fast, information-theoretic postprocessing
algorithm that seeks to jointly maximize the likelihood of the
image given a remote scene, as well as an estimate for Fried's
seeing parameter to describe current atmospheric conditions. That
research employed a short-exposure OTF to model the anisoplanatic
system response for a series of motion-compensated images.
Although results from the algorithm were encouraging, it was
understood that the short-exposure OTF provided an optimistic
model for the overall anisoplanatic blur function caused by
turbulence. A more accurate OTF accounts for not only the global
shift of each image collected in the ensemble, but also for the
blur induced by random and uncorrelated shifts of each of the many
isoplanatic patches collected at the imaging device. This research
complements the blind deconvolution algorithm by deriving an
anisoplanatic OTF (AOTF) that better models the blur function of a
motion-compensated ensemble of images. Results are presented that
compare the recovered images obtained using both the
short-exposure OTF as well as the AOTF.
Adam MacDonald andStephen Cain
"Derivation and application of an anisoplanatic optical transfer function for blind deconvolution of laser radar imagery", Proc. SPIE 5896, Unconventional Imaging, 589603 (23 August 2005); https://doi.org/10.1117/12.618109
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Adam MacDonald, Stephen Cain, "Derivation and application of an anisoplanatic optical transfer function for blind deconvolution of laser radar imagery," Proc. SPIE 5896, Unconventional Imaging, 589603 (23 August 2005); https://doi.org/10.1117/12.618109