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Sebastien Breugnot

Bio: Sebastien Breugnot is an academic researcher from Procter & Gamble. The author has contributed to research in topics: Polarization (waves) & Optical polarization. The author has an hindex of 3, co-authored 6 publications receiving 65 citations.

Papers
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Proceedings ArticleDOI
28 May 1999
TL;DR: In this article, the authors presented the modeling and the performances of a polarization active imager at (lambda) equals 806 nm, operating in a monostatic configuration, using a semiconductor laser to illuminate the target and a telescope to create the image on a CCD matrix.
Abstract: We present the modeling and the performances of a Polarization Active Imager at (lambda) equals 806 nm. The device is operating in a monostatic configuration, using a semiconductor laser to illuminate the target and a telescope to create the image on a CCD matrix. Dual images (intensity and polarization degree) of different scenes are obtained by a new method (only 2 images acquisition) and analyzed, showing the experimental validation of this concept. The application of this active imager to the detection of target buried in the background (same reflectivity but different polarization degree) is proposed.

35 citations

Proceedings ArticleDOI
03 Apr 2008
TL;DR: In this paper, a linear Stokes polarization camera working at visible wavelength is presented, which allows live calculation, visualization, and measurement of polarization images deduced from the acquired images.
Abstract: We present a linear Stokes polarization camera working at visible wavelength. The camera is both compact and robust for use in field experiments and outdoor conditions. It is based on fast polarization modulator. Four polarization states images are acquired successively. Processing software allows live calculation, visualization and measurement of polarization images deduced from the acquired images. The architecture of the hardware, calibration results and sensitivity measurements is presented. Polarization image processing including polarization parameters computed are proposed. These parameters include linear Stokes parameters (S0, S1 and S2), usual polarization parameters (intensity, degree of linear polarization, and angle of polarization) and other polarization based parameters (polarized image, depolarized image, virtual polarizer, polarization difference). Color data fusion and vector overlay algorithms are presented. Finally experimental results and observations as well as possible applications are discussed.

24 citations

Patent
25 Sep 2009
TL;DR: In this paper, a method to determine the orientation of randomly arranged birefringent fibers is described, which consists of emitting light, creating N i polarization states of the emitted light, illuminating the bireringent fiber with the reflected light so polarized, thereby generating IR i internal reflection components of the light in the fiber, observing the light from the illuminated fiber, creating O i polarization state of the observed light, forming I i images of the polarized light, each image comprising an information (N i, O i, IR i ), wherein i=1, 2,
Abstract: Methods and apparatus to determine the orientation of randomly arranged birefringent fibers are disclosed. One method comprises emitting light, creating N i polarization states of the emitted light, illuminating the birefringent fibers with the emitted light so polarized, thereby generating IR i internal reflection components of the light in the birefringent fibers, observing the light from the illuminated birefringent fibers, creating O i polarization states of the observed light, forming I i images of the observed polarized light, each image comprising an information (N i , O i , IR i ), wherein i=1, 2, . . . , n and n≧3, separating the i-th internal reflection component from the i-th image, and calculating an angle of a neutral axis of the birefringent fibers using the IR i internal reflection components.

4 citations

Patent
25 Sep 2009
TL;DR: In this article, a method to measure visual appearance of randomly arranged birefringent fibers is described, which consists of emitting light, creating N i polarization states of the emitted light, illuminating the bireringent fiber with the emitted emitted light so polarized, thereby generating IR i internal reflection components, ER i external reflection components and D i diffusion components of the light in the fiber, observing the light from the illuminated birerringent fibre and forming X i images of the observed polarized light, each image comprising an information (N i, O i, IR i
Abstract: Methods and apparatus to measure visual appearance of randomly arranged birefringent fibers are disclosed. One method comprises emitting light, creating N i polarization states of the emitted light, illuminating the birefringent fibers with the emitted light so polarized, thereby generating IR i internal reflection components, ER i external reflection components, and D i diffusion components of the light in the birefringent fibers, observing the light from the illuminated birefringent fibers, creating O i polarization states of the observed light, forming X i images of the observed polarized light, each image comprising an information (N i , O i , IR i , ER i , D i ), wherein i=1, 2, . . . n and n≧4, measuring the intensity I i in each pixel in the X, images, and separating the i-th internal reflection component, the i-th external reflection component, and the i-th diffusion component from the i-th image for the X i images.

3 citations

Proceedings ArticleDOI
03 Apr 2008
TL;DR: In this paper, a Stokes polarization camera based on an electro-optic ceramic (PLZT) component is presented, where two pairs of electrodes are used to control the applied electric field and so the retardance and orientation of the induced waveplate.
Abstract: We present a Stokes polarization camera prototype based on an electro-optic ceramic (PLZT) as the key polarization component. Two pairs of electrodes are used to control the applied electric field and so the retardance and orientation of the induced waveplate. The active area of the PLZT element is 120x120µm. To increase the effective active area, a 2D array PLZT is used. Imaging through this 2D array with reduced fill factor is achieved by splitting the focal plane. The focal plane is split by a microlenses array and interacts with each element of the ceramic array. A modified focal plane is reconstructed by another microlenses array. Digital image processing is used to recover the prime focal plane information. The technology used in this device (ceramic element, 2D array, imaging with split focal plane) as well as characterization of the ceramic element and preliminary results will be presented.

2 citations


Cited by
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Journal ArticleDOI
Jian Liang1, Liyong Ren1, Enshi Qu1, Bingliang Hu1, Yingli Wang1 
TL;DR: A novel polarimetric dehazing method based on three linear polarization images based on the polarization orientation angle of the light scattered by the haze particles is proposed and it is found that the dehazed image suffers from little noise and the details of the objects close to the observer can be preserved well.
Abstract: A novel polarimetric dehazing method is proposed based on three linear polarization images (0°, 45°, and 90°). The polarization orientation angle of the light scattered by the haze particles is introduced in the algorithm. No additional image-processing algorithm is needed in the postprocessing. It is found that the dehazed image suffers from little noise and the details of the objects close to the observer can be preserved well. In addition, this algorithm is also proved to be useful for preserving image colors. Experimental results demonstrate that such an algorithm has some universality in handling all kinds of haze. We think that this robust algorithm might be very suitable for real-time dehazing.

62 citations

Journal ArticleDOI
TL;DR: It is found that good detection performances rely on joint use of intensity and polarimetric images, with these images exhibiting complementary signatures in most cases.
Abstract: We report on the design and exploitation of a real-field laboratory demonstrator combining active polarimetric and multispectral functions. Its building blocks, including a multiwavelength pulsed optical parametric oscillator at the emission side and a hyperspectral imager with polarimetric capability at the reception side, are described. The results obtained with this demonstrator are illustrated on some examples and discussed. In particular it is found that good detection performances rely on joint use of intensity and polarimetric images, with these images exhibiting complementary signatures in most cases.

55 citations

Patent
14 Jan 2011
TL;DR: In this paper, field balancing is performed with an irradiation system including a plurality of adjustable radiant-energy emitters, where an amount of radiant energy emitted from each emitter is capable of being varied based on power received from the power source.
Abstract: Field balancing may be performed with an irradiation system including a plurality of adjustable radiant-energy emitters. The irradiation system powers the radiant-energy emitters from a power source and radiant energy is emitted from the radiant-energy emitters, where an amount of radiant energy emitted from each emitter is capable of being varied based on power received from the power source. A plurality of radiant-energy sensors detects an amount of radiant energy which includes radiant energy created directly by at least one of the radiant-energy emitters. The amount of radiant energy detected at at least two of the radiant-energy sensors is compared, and at least one of the radiant-energy emitters is adjusted by varying the power received from the power source so that the amount of radiant energy detected at each of the radiant-energy sensors tends towards becoming approximately equal. The emitting of radiant energy from each radiant-energy emitter is terminated when a total amount of radiant energy emitted from the plurality of adjustable radiant-energy emitters exceeds a predetermined threshold value, where the threshold value is sufficient to allow the total amount of radiant energy emitted from the plurality of adjustable radiant-energy emitters to sanitize a particular area in which the emitters are located.

41 citations

Journal ArticleDOI
TL;DR: This work proposes a general method to maximize the polarimetric contrast between an object and its background using a predetermined illumination polarization state and shows a noticeable increase in the Bhattacharyya distance used as the contrast parameter.
Abstract: We propose a general method to maximize the polarimetric contrast between an object and its background using a predetermined illumination polarization state. After a first estimation of the polarimetric properties of the scene by classical Mueller imaging, we evaluate the incident polarized field that induces scattered polarization states by the object and background, as opposite as possible on the Poincar e sphere. With a detection method optimized for a 2-channel imaging system, Monte Carlo simulations of low flux coherent imaging are performed with various objects and backgrounds having different properties of retardance, dichroism and depolarization. With respect to classical Mueller imaging, possibly associated to the polar decomposition, our results show a noticeable increase in the Bhattacharyya distance used as our contrast parameter.

40 citations

Journal ArticleDOI
Jing Bai1, Chu Wang1, Xiahui Chen1, Ali Basiri1, Chao Wang1, Yu Yao1 
TL;DR: In this article, chip-integrated metasurface devices for polarization detection of mid-infrared light with arbitrary polarization states are presented. But they are not suitable for on-chip mid-IR polarimeters and polarimetric imaging systems.
Abstract: Flat optics presents a new path to control the phase, amplitude, and polarization state of light with ultracompact devices. Here we demonstrate chip-integrated metasurface devices for polarization detection of mid-infrared light with arbitrary polarization states. Six high-performance microscale linear and circular polarization filters based on vertically stacked plasmonic metasurfaces (with total thickness <600 nm) are integrated on the same chip to obtain all four Stokes parameters of light with high accuracy. The device designs can be tailored to operate at any wavelength in the mid-infrared spectral region and are feasible for on-chip integration with mid-infrared (mid-IR) photodetectors and imager arrays. Our work will enable on-chip mid-IR polarimeters and polarimetric imaging systems, which are highly desirable for many applications, such as clinical diagnosis, target detection, and space exploration.

40 citations