Burst illumination imaging lidar: intensity correlation function in the image plane

Édouart, Dimitri; Churoux, P.; Flamant, Pierre H.

doi:10.1117/12.476411

Cited by 3 publications

(3 citation statements)

References 4 publications

(5 reference statements)

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“…Edouart et.al 20 analyzes the intensity correlation in the image plane for the coupled target speckle scintillation speckle case which give insight into the speckle contrasts and size. This information is of high value for speckle simulation in the image plane.…”

Section: Atmospheric Effectsmentioning

confidence: 99%

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Image quality for range-gated systems during different ranges atmospheric conditions

2006

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Range-gated or burst illumination systems have recently drawn a great deal of attention concerning the use for target classification. The development of eye safe lasers and detectors will make these systems ideal to be combined with thermal imagers for long range targeting at night but also for short range security applications like reading of signs and licence plates, looking into cars and buildings etc. Examples of imagery collected for different range and atmospheric conditions will be presented and discussed with respect to image quality and processing techniques.

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Section: Atmospheric Effectsmentioning

confidence: 99%

“…Recently new efforts in modelling atmospheric and target speckle effects for range gated imaging have appeared in a number of publications 17,18,19,20 . The atmospheric effects on gated viewing has been describes in our earlier work 3 .…”

Section: Atmospheric Effectsmentioning

confidence: 99%

Image quality for range-gated systems during different ranges atmospheric conditions

2006

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“…To simulate the pulsed coherent BIL imaging system, illustrated schematically in Fig. 5, we use models of laser propagation similar to those described in [5,7,25]. In general, there are two principal degrading effects that we can include in physical simulation of BIL imagery: speckle induced by the interaction of the rough surface with the laser source, and the effect of turbulence introduced by the atmospheric propagation path, usually modelled by a refractive index structure constant, conventionally indicated as C n 2 .…”

Section: Physical Simulation Of Bil Imagerymentioning

confidence: 99%

SimBIL: appearance-based simulation of burst-illumination laser sequences

et al. 2008

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A novel appearance-based simulator of burst illumination laser sequences, SimBIL, is presented and the sequences it generates are compared with those of a physical model-based simulator that the authors have developed concurrently. SimBIL uses a database of 3D, geometric object models as faceted meshes, and attaches example-based representations of material appearances to each model surface. The representation is based on examples of intensity-time profiles for a set of orientations and materials. The dimensionality of the large set of profile examples (called a profile eigenspace) is reduced by principal component analysis. Depth and orientation of the model facets are used to simulate time gating, deciding which object parts are imaged for every frame in the sequence. Model orientation and material type are used to index the profile eigenspaces and assign an intensity-time profile to frame pixels. To assess comparatively the practical merit of SimBIL sequences, the authors compare range images reconstructed by a reference algorithm using sequences from SimBIL, from the physics-based simulator, and real BIL sequences.

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Active and passive short-wave infrared and near-infrared imaging for horizontal and slant paths close to ground

Steinvall¹,

Elmqvist²,

Chevalier³

et al. 2013

Appl. Opt.

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This paper investigates active and passive short-wave infrared (SWIR) imaging for slant paths close to ground. The main sensor, a gated SWIR camera, was collecting both passive and active images along a 2 km long path over an airfield and also from our rooftop laboratory looking over open fields. For some investigations we also used a gated system working in the near-infrared region and thermal as well as color CCD cameras. The sensor was elevated by a lift in steps from 1.6-13.5 m or placed in a rooftop laboratory 13 m above ground. Targets were resolution charts and man targets. The turbulence was measured along the path with anemometers and scintillometers. The image performance was evaluated by measurement of the image blur and also by performing observer perception tests. The results reveal a strong dependence on the sensor height especially during daytime.

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Burst illumination imaging lidar: intensity correlation function in the image plane

Cited by 3 publications

References 4 publications

Image quality for range-gated systems during different ranges atmospheric conditions

Image quality for range-gated systems during different ranges atmospheric conditions

SimBIL: appearance-based simulation of burst-illumination laser sequences

Active and passive short-wave infrared and near-infrared imaging for horizontal and slant paths close to ground

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