&lt;title&gt;Atmospheric and sea state dependence of polarized infrared contrast&lt;/title&gt;

Walker, P.L.; Lentz, William J.; Cooper, Alfred W.

doi:10.1117/12.210607

Cited by 9 publications

(6 citation statements)

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“…Target aspect, registration, and apparent size oftarget are uncertain. Contrast values for these have however been evaluated and shown previously (12), d show large scatter around a decreasing trend with range increase. For these images the Contrast Improvement Factor has been evaluated using the defmition ofEq.…”

Section: Contrast Improvement Computationmentioning

confidence: 98%

Infrared polarization ship images and contrast in the MAPTIP experiment

1996

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Shore-based polarized infrared images ofship target and background were obtained in the MAPTIP measurement series, using vertical and horizontal polarization filters. These images have been analyzed to yield degree ofpolarization and polarization contrast enhancement for targets with sea and sky background. Strong vertical polarization is observed in the sea surface emission near the Brewster Angle in the 8-12 micrometer (LWIR) band, whereas horizontal polarization due to reflection is usually dominant in the 3-5 micrometer (MWIR) band. Ship targets at broadside aspect show a degree of polarization less than 5%. An enhancement of contrast by up to 30% in the LWIR (less in the MWTR) is obtained by polarization suppression of sea background. The contrast enhancement in the MWIR is counteracted by the horizontal polarization of reflected sunlight.

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Section: Contrast Improvement Computationmentioning

confidence: 98%

Infrared polarization ship images and contrast in the MAPTIP experiment

1996

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“…However, they did not explore polarisation for the combined emitted effect and reflected effect. Cooper et al [7][8][9] and Walker et al [10] investigated the degree of polarisation of sea water surface in the mid-wave band and longwave band, and they used the degree of polarisation image to improve the contrast of the ship target to the sea background. However, the image of polarisation degree is susceptible to noise contamination, which will cause a loss of details.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of dim targets in a sea background based on long‐wave infrared polarisation features

Zhang

Shi

2018

IET Image Processing

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“…• IR extinction coefficient (σ) for MWIR good transmission conditions (74%) > VIS extinction coefficient (74%) <for VIS good transmission conditions (83%); • decreasing the image contrast due to increased polarization [3,4], especially during the day and sunny sky conditions; • increasing the probability of detection over 6 times during the observation time increases to approx.15 sec [5];…”

Section: Introductionmentioning

confidence: 99%

An Analytical Approach Regarding Some Radiometric Problems during the Detection on the Sea Surface with a Thermal Camera

Spulber

Borcan²

2013

AMM

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The paper presents some methods to evaluate a thermal signature acquired with a thermal camera from some targets in marine background. Using a simulation interface made in MAVIIS 1,5 [ and with the ImageJ [ analysis software, the authors reveal the dependence between the atmospheric pollution, geometrical and radiometric characteristics of the targets and their backgrounds used during the sea surface detection, and the system performance of the thermal camera sensor.

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<title>Atmospheric and sea state dependence of polarized infrared contrast</title>

Cited by 9 publications

References 0 publications

Infrared polarization ship images and contrast in the MAPTIP experiment

Infrared polarization ship images and contrast in the MAPTIP experiment

Enhancement of dim targets in a sea background based on long‐wave infrared polarisation features

An Analytical Approach Regarding Some Radiometric Problems during the Detection on the Sea Surface with a Thermal Camera

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