&lt;title&gt;Comparison of techniques for image reconstruction using reflective tomography&lt;/title&gt;

Magee, Eric P.; Matson, Charles L.; Stone, David L.

doi:10.1117/12.188060

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…The usefulness of tomography comes from the relationship of the Fourier transform of p0(x2), P9(u2), and the Fourier transform of g(x1,y1), G(u1,v1). The relationship is called the projection-slice theorem and is given by: F9(u2) = G(u1 cos8,v1 siru9) (2) which states that the Fourier transform of a projection at angle e is equal to the Fourier transform of g(x1,y1) evaluated along a line through the origin oriented in the same manner in the (u1,v1) plane as the projection is in the (x1,y1) plane. Thus we can get samples of G(u1,v1) from a projection of g(x1,y1).…”

Section: Review Of Tomographymentioning

confidence: 99%

Field demonstration and characterization of a 10.6-μm reflection tomography imaging system

Hanes

Benham

Lasche

et al. 2001

Atmospheric Propagation, Adaptive Systems, and Laser Radar Technology for Remote Sensing

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A field experiment to investigate an imaging technique based on reflection tomography has been performed at the Air Force Research Laboratory. The experiment, called HILT (Heterodyne Imaging Laser Testbed), involves the illumination of objects with short pulses of laser radiation, and the measurement of the temporal characteristics of return pulses scattered by the object. Return pulses, referred to as projections, provide range resolved information characteristic of the object surface shape and viewing angle. By obtaining multiple projections at different viewing angles, a tomographic reconstruction of the object's surface can be obtained. Recent testing has produced images of targets at a range of 990 meters using 1 .4 ns pulses from a 10.6 CO2 laser. A heterodyne detection technique was utilized to record the weak return signals. The results obtained from this system are believed to be the first LADAR range resolved reflection tomographic images of diffuse objects in a field environment, and the first use of a heterodyne detection system for LADAR reflection tomography. A description of the system is provided and experimental results are presented.

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Section: Review Of Tomographymentioning

confidence: 99%

Field demonstration and characterization of a 10.6-μm reflection tomography imaging system

Hanes

Benham

Lasche

et al. 2001

Atmospheric Propagation, Adaptive Systems, and Laser Radar Technology for Remote Sensing

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“…The Radon-Fourier transform method for transmission tomography is based on Fourier-slice theorem which states that the 1-D Fourier transform of a projection is a slice through the 2-D Fourier transform of the target [2,6] . Fig.2 shows the progress of Fourier-slice theorem.…”

Section: Review Of Radon-fourier Transform For Transmission Tomographymentioning

confidence: 99%

“…The range-resolved Laser radar reflective tomography imaging laser radar was firstly introduced by researchers Parker [1,2] , Knight [3,4] at the Massachusetts Institute of Technology. Several years later, Matson [5][6][7][8][9][10][11] in Air Force began exploring the technique of using the HI-CLASS coherent laser radar system to obtain reflective images by carrying out a heterodyne system analysis, deriving and validating imaging signal to noise ratio expressions and so on.…”

Section: Introductionmentioning

confidence: 99%

Modified radon-Fourier transform for reflective tomography laser radar imaging

et al. 2011

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This paper presents imaging result of computer simulation using a modified Radon-Fourier transform algorithm to reconstruct images from reflective tomography data. Since the signal returned is reflected off the illuminated outer surface of an opaque target, only information about the exterior of the target can be obtained, and the images reconstructed using reflective tomography techniques is an outline view of the target cross section. The projection ( , ) p r φ and ( , )p r φ + o contain different information about the target surface, and will lead different Fourier estimates along the same line through the origin based on the standard Fourier-Slice tomography theorem. Here, using the functional similarity between transmission tomography and reflective tomography, we add the collinear reflective projections to become corresponding transmissive projections before Fourier transform. Then the target can be reconstructed from the Fourier domain using the same operations in transmission tomography. The computer simulation result demonstrates the effectiveness of this modified algorithm to reconstruct image in reflective tomography using the diffuse reflection model (lamberts body). Future research will include the development of image reconstruction based on this modified algorithm for targets with much more complicated reflective characters.

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“…These techniques are especially applicable for an object that is not rotating fast enough to have its Doppler spectrum resolved by the receiver, and they can be used with data from both coherent and incoherent detection systems. Resolution is available in one dimension only (range), so to create a 2-D image, multiple view angles are necessary [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Short pulselength direct-detect laser reflective tomography imaging ladar: field results

Sun

Jin

Zhou

et al. 2010

Detectors and Imaging Devices: Infrared, Focal Plane, Single Photon

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Range-resolved reflective tomography using short pulselength lasers has been shown to be an image reconstruction method which can be used to recover image information about an object with a non-imaging laser radar (ladar) system. The resulting time-dependent return signal (Project) is collected by a non-imaging optical system, which provides a onedimensional signal as a function of range. The resulting time-dependent return signal is collected by a non-imaging optical system, which provides a one-dimensional signal as a function of range. This one-dimensional signal is related to a one-dimensional slice of the spatial 3-D Fourier transform of the object. Consequently, the resolution of the object remains constant, regardless of the object's distance from the optical system. This paper presents the field results of a short pulselength direct-detect laser reflective tomography imaging ladar, and gives the image reconstruction results. The intervals of the projections are different because of the variable speed of the imaging object. In order to efficiently improve and modify the image reconstruction quality in the field experiments, we develop a new imaging reconstruction algorithm based on the feature point in the projection data to overcome the nonuniform intervals between adjacent projections. The experiment results show our algorithm is feasible and efficient. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 08/17/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Proc. of SPIE Vol. 7780 778017-2 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 08/17/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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<title>Comparison of techniques for image reconstruction using reflective tomography</title>

Cited by 9 publications

References 5 publications

Field demonstration and characterization of a 10.6-μm reflection tomography imaging system

Field demonstration and characterization of a 10.6-μm reflection tomography imaging system

Modified radon-Fourier transform for reflective tomography laser radar imaging

Short pulselength direct-detect laser reflective tomography imaging ladar: field results

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