Thematische Bibliographien / Luminance analyser

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Auswahl der wissenschaftlichen Literatur zum Thema „Luminance analyser“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 18. Februar 2022

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Zeitschriftenartikel zum Thema "Luminance analyser"

Syrkin, Gil, und Moshe Gur. „Colour and Luminance Interact to Improve Pattern Recognition“. Perception 26, Nr. 2 (Februar 1997): 127–40. http://dx.doi.org/10.1068/p260127.

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The authors have previously hypothesised that colour vision has evolved not only to encode colour per se but also, perhaps principally, to enhance luminance-based visual processing, so that for colour information to be fully effective, luminance as well as chromatic variations should be present in visual targets. Results of previous experiments, testing detection of spatial gratings and detection and perceived brightness of Mach bands support the hypothesis. Further experiments are reported in which the hypothesis was tested by using a higher-level task of pattern recognition. Subjects had to discriminate between luminance (isochromatic), isoluminant (chromatic), or combined colour/luminance ellipses and circles. It was found that the ability to discriminate between a circle and an ellipse was greatly enhanced when both colour and luminance variations were present as compared with the pure luminance or colour presentations. Summation-square analysis shows linear colour-luminance summation which can be modeled by a single-analyser model.

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Bará, Salvador, Martin Aubé, John Barentine und Jaime Zamorano. „Magnitude to luminance conversions and visual brightness of the night sky“. Monthly Notices of the Royal Astronomical Society 493, Nr. 2 (04.02.2020): 2429–37. http://dx.doi.org/10.1093/mnras/staa323.

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ABSTRACT The visual brightness of the night sky is not a single-valued function of its brightness in other photometric bands, because the transformations between photometric systems depend on the spectral power distribution of the skyglow. We analyse the transformation between the night sky brightness in the Johnson–Cousins V band (mV, measured in magnitudes per square arcsecond, mpsas) and its visual luminance (L, in SI units cd m−2) for observers with photopic and scotopic adaptation, in terms of the spectral power distribution of the incident light. We calculate the zero-point luminances for a set of skyglow spectra recorded at different places in the world, including strongly light-polluted locations and sites with nearly pristine natural dark skies. The photopic skyglow luminance corresponding to mV=0.00 mpsas is found to vary in the range 1.11–1.34 × 105 cd m−2 if mV is reported in the absolute (AB) magnitude scale, and in the range 1.18–1.43 × 105 cd m−2 if a Vega scale for mV is used instead. The photopic luminance for mV=22.0 mpsas is correspondingly comprised between 176 and 213 μcd m−2 (AB), or 187 and 227 μcd m−2 (Vega). These constants tend to decrease for increasing correlated colour temperature (CCT). The photopic zero-point luminances are generally higher than the ones expected for blackbody radiation of comparable CCT. The scotopic-to-photopic luminance (S/P) ratio for our spectral data set varies from 0.8 to 2.5. Under scotopic adaptation the dependence of the zero-point luminances with the CCT, and their values relative to blackbody radiation, is reversed with respect to photopic ones.

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Djokic, L., A. Cabarkapa und A. Djuretic. „Drivers’ impressions under high-pressure sodium and LED street lighting“. Lighting Research & Technology 50, Nr. 8 (20.10.2017): 1212–24. http://dx.doi.org/10.1177/1477153517727802.

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In order to compare drivers’ subjective impressions when exposed to high-pressure sodium versus LED street lighting, an experiment was conducted on a Belgrade street. All general requirements for an adequate comparison of subjective impressions, equal luminances being the most important, were fulfilled. A survey was conducted using a questionnaire, which the respondents filled out immediately after driving through both zones of the illuminated street. The respondents, who were young drivers (students), aged 20–25 years, were asked to select the more appropriate of the two installations regarding seven lighting parameters as well as giving their overall impression. The two regimes for which the survey was done gave opposite results. In the normal regime, where both installations had the same photopic luminance, the LED installation was evaluated as a better solution by a majority of the respondents for most of the analysed parameters. In the mesopic regime, where both installations had the same mesopic luminance, most of the respondents judged that the high-pressure sodium installation was the better choice.

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Grodon, A., und M. Fahle. „Parallel Processing of Luminance Steps in the Presence of Luminance Gradients“. Perception 25, Nr. 1_suppl (August 1996): 62. http://dx.doi.org/10.1068/v96l0602.

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Some features of complex visual displays are analysed effortlessly and in parallel by the human visual system, without requiring scrutiny. Examples for such features are changes of luminance, colour, orientation, and movement. We measured thresholds as well as reaction times for the detection of abrupt spatial changes in luminance in the presence of luminance gradients, in order to evaluate the ability of the system to ignore such gradients. Stimuli were presented on a 20 inch monitor under control of a Silicon Graphics workstation. Luminance was calibrated by means of a photometer (Minolta). We presented between 4 and 14 rectangles simultaneously on a homogeneous dark background. Rectangles were arranged on an incomplete, imaginary circle around the fixation point and luminance changed stepwise from one rectangle to the next. Five observers had to indicate whether all luminance steps between the rectangles were subjectively equal or whether one luminance step was larger. Detection thresholds were determined for the larger step as a function of the small steps (‘base step size’) by means of an adaptive staircase procedure. The smallest luminance steps were detected when the base step size was zero and when only few rectangles were presented. Thresholds increased slightly with the number of rectangles displayed simultaneously, and to a greater extent (by up to a factor of 2) with increasing base step size. The results of all observers improved significantly through practice, by about a factor of 2. We conclude that the visual system is unable to completely eliminate gradients of luminance and to isolate sharp transitions in luminance.

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Liu, Long, Yun Cui Zhang und Jun Xiao. „The Influencing Factor Analyses of Narrow Beam LED Luminaire Performance Test“. Advanced Materials Research 694-697 (Mai 2013): 3283–86. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.3283.

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The beam angle of the luminaire is an important factor to influence testing method. This paper mainly discusses the narrow beam luminaire test methods, especially luminaires space photometric, chromaticity characteristic test method. The factors step length and test time which influence spatial distribution photometer are analyzed. An example is introduced which show how to set electrical parameter, photometry parameter test efficiency for a narrow beam LED luminaire.

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Solano Lamphar, HA, und M. Kocifaj. „Urban night-sky luminance due to different cloud types: A numerical experiment“. Lighting Research & Technology 48, Nr. 8 (03.08.2016): 1017–33. http://dx.doi.org/10.1177/1477153515597732.

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In this paper, we analyse theoretically and numerically the sky glow in urban and suburban areas, focusing on the zenith-normalised luminance of a cloudy sky. The results suggest that the altitude of a cloud imposes important changes in the luminance distribution. Peak values of sky luminance can be observed at a distance [Formula: see text], where R is the city radius, and h is the cloud altitude. Fluctuations of the zenith-normalised luminance over the city are dictated by three effects, specifically (i) extinction and backscatter in the undercloud atmosphere, (ii) the cloud properties and (iii) the radiant intensity function of the dominant ground-based light sources. For high clouds, the aerosol optical property is evident at moderate elevation angles. The light beams emitted from different parts of the city propagate along different inclined trajectories before they contribute to the elevated zenith luminance of low clouds. Then, multiple factors combine together to form the light field at the ground, city-size and city emission pattern being of specific importance.

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Karatsai, Eleni, Piyali Sen, Sarega Gurudas und Sobha Sivaprasad. „Low Luminance Visual Acuity and Low Luminance Deficit in Proliferative Diabetic Retinopathy“. Journal of Clinical Medicine 10, Nr. 2 (19.01.2021): 358. http://dx.doi.org/10.3390/jcm10020358.

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This study aimed to determine the relation of best corrected visual acuity (BCVA) and low luminance visual acuity (LLVA) in proliferative diabetic retinopathy (PDR) following treatment with either aflibercept or pan-retinal photocoagulation (PRP). The study was conducted as a post-hoc analysis of the CLARITY trial in which naïve and PRP treated PDR patients were randomised to receive either aflibercept or PRP. BCVA and LLVA were assessed at baseline and at week 52. Our analyses showed that the BCVA and LLVA correlate well in treatment naïve PDR with an average low luminance deficit of 11.79 Early Treatment Diabetic Retinopathy Score (ETDRS) letters. However, LLVA at lower levels of BCVA showed more variance. Post aflibercept therapy, the mean change in BCVA and LLVA at 52 weeks after aflibercept was +2.1 (SD 6.05) letters and +0.39 (SD 5.6) letters, respectively. Similarly, after PRP, it was −2.5 (SD 4.9) letters and −1.9 (SD 8.7) letters, respectively. When comparing treatment arms, BCVA change was found to be statistically significant (p < 0.001) whereas LLVA was not (p = 0.11). These findings show that LLVA does not respond as well as BCVA following any treatment for PDR, even though BCVA and LLVA both test foveal function.

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Padmasali, AN, und SG Kini. „A novel measure to analyse the reliability of LED luminaires“. Lighting Research & Technology 51, Nr. 7 (11.09.2018): 1063–76. http://dx.doi.org/10.1177/1477153518798872.

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LED luminaires are the most promising lighting solutions for general lighting in the current era due to their durability and lower power consumption. Reliability of LED luminaires is dependent on the electrolytic capacitor at the output stage of the LED driver as this is the weakest link failing the luminaire. So, it is required to develop a general measure to understand the effect of capacitance on the drive current and thus on the light output to analyse the reliability of the LED luminaire. To investigate the effect of capacitance and equivalent series resistance (ESR), a capacitor bank setup is developed, with values ranging from 0.017 μF to 860 μF. Six LED luminaires of different ratings and manufacturers are selected and drive current, and lumen output for each is studied. Based on the drive current ripple patterns observed, capacitors are classified into two classes, and also percentage flicker is determined. As driver capacitors decide the amount of ripple in the output current, a generalised measure of capacitance and ESR limit is established for the LED luminaire to work reliably. The work also helps in formulating metrics for determining the service life of an LED luminaire accurately.

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Molino, John A., Kenneth S. Opiela, Carl K. Andersen und M. Joseph Moyer. „Relative Luminance of Retroreflective Raised Pavement Markers and Pavement Marking Stripes on Simulated Rural Two-Lane Roads“. Transportation Research Record: Journal of the Transportation Research Board 1844, Nr. 1 (Januar 2003): 45–51. http://dx.doi.org/10.3141/1844-06.

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The FHWA Turner-Fairbank Highway Research Center is undertaking a research program to study the visibility of retroreflective raised pavement markers (RRPMs). The focus of the initial effort is to determine the relative luminance of RRPMs and pavement markings (PMs) needed to produce adequate guidance on rural two-lane roadways at night. A driving simulator was used to test 36 research participants as they drove simulated roadways containing various combinations of RRPMs and PMs. The luminance of the simulated roadway delineation ranged from 0.07 to 4.1 cd/m2. The primary driver performance measure was curve-recognition distance. For the various RRPM and PM luminance conditions, mean curve-recognition distances ranged from 19.0 m (62.3 ft) to 68.4 m (224 ft), with a grand mean of 43.0 m (141 ft). Regression analyses produced predictive equations to estimate the mean curve-recognition distance from the luminance of RRPMs acting alone or of PMs acting alone. Trading ratios were computed for PM luminance with and without RRPMs present on the road. A conservative empirical estimate of 0.52 was computed for such a trading ratio based on the data from the current experiment. This value compared favorably with independent estimates of 0.54 and 0.55 based on an earlier analytical approach. Thus, the current experiment confirmed, with empirical data, earlier estimates that it might be possible to reduce the luminance of PMs on rural two-lane roads by about 45% when appropriate RRPMs are installed.

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Troscianko, T., C. A. Parraga, G. Brelstaff, D. Carr und K. Nelson. „Spatio-Chromatic Information Content of Natural Scenes“. Perception 25, Nr. 1_suppl (August 1996): 162. http://dx.doi.org/10.1068/v96l1009.

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A common assumption in the study of the relationship between human vision and the visual environment is that human vision has developed in order to encode the incident information in an optimal manner. Such arguments have been used to support the 1/f dependence of scene content as a function of spatial frequency. In keeping with this assumption, we ask whether there are any important differences between the luminance and (r/g) chrominance Fourier spectra of natural scenes, the simple expectation being that the chrominance spectrum should be relatively richer in low spatial frequencies than the luminance spectrum, to correspond with the different shape of luminance and chrominance contrast sensitivity functions. We analysed a data set of 29 images of natural scenes (predominantly of vegetation at different distances) which were obtained with a hyper-spectral camera (measuring the scene through a set of 31 wavelength bands in the range 400 – 700 nm). The images were transformed to the three Smith — Pokorny cone fundamentals, and further transformed into ‘luminance’ (r+g) and ‘chrominance’ (r-g) images, with various assumptions being made about the relative weighting of the r and g components, and the form of the chrominance response. We then analysed the Fourier spectra of these images using logarithmic intervals in spatial frequency space. This allowed a determination of the total energy within each Fourier band for each of the luminance and chrominance representations. The results strongly indicate that, for the set of scenes studied here, there was no evidence of a predominance of low-spatial-frequency chrominance information. Two classes of explanation are possible: (a) that raw Fourier content may not be the main organising principle determining visual encoding of colour, and/or (b) that our scenes were atypical of what may have driven visual evolution. We present arguments in favour of both of these propositions.

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Dissertationen zum Thema "Luminance analyser"

Rampák, Dominik. „Hodnocení oslnění exteriérových osvětlovacích soustav“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442545.

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Glare is an important, but often overlooked parameter in lighting systems design. This parameter can significantly affect human biorhythm, causing a discomfort or in the worst cases it can dazzle drivers, which can lead to car accidents. Therefore, it´s necessary for lighting designers to consider glare in their designs, specifically threshold increment value. This thesis focuses on glare measurement caused by exterior lighting systems and comparison of usage different types of camera lens for threshold increment measurements with luminance analyser. For a better understanding of the whole issue, there is a part describing how human eye perceives light, which is followed by definition and division of the glare. Afterwards, there is part describing calculation procedure of the threshold increment, which serves as a basis for the practical part of the thesis. Practical part of the thesis is dedicated to experimental measurement of glare from exterior lighting system on Technická street, right behind VUT FEKT T12 building. The measurement is done using luminance analyser and the LumiDISP program, while 3 lenses are used for the measurements. The output of this thesis are values of threshold increment obtained by using 4 different methods (3 lenses) and subsequent comparison of the suitability of the lenses for the glare measurements. To supplement, a simulation of the measured lighting system in the Relux program and a subsequent comparison of the results with the measured values are performed.

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Vlček, Pavel. „Analýza schopnosti jasového analyzátoru LDA - LumiDISP měřit náhradní teplotu chromatičnosti“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442553.

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This master's thesis deals with the search of commercially available luminance analysers and cameras that use the measurement of correlated colour temperature. It also deals with calculations of correlated colour temperature according to various available methods. The luminance analyser LDA-LumiDISP is based on a DSLR camera. The principle of its operation and possible errors in capturing pictures are discussed here. The work deals with extensive testing of the LDA-LumiDISP luminance analyser, which is primarily intended for measuring luminance in the set scene, but can also be used to measure the correlated colour temperature. The device is being tested in terms of measuring the correlated colour temperature in laboratory and field conditions. The result of the master's thesis is the calculation of measurements uncertainty for certain light sources and the optimization of the measuring algorithm to reduce them.

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Škoda, Jan. „Nekonvenční metody měření ve fotometrii“. Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-233542.

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This thesis deals with an unconventional possibility of measuring photometric values and the work is based on analysis of luminance made by commercially available digital photo camera. In the first part is represent an overview of current methods for measuring the photometry. You also can see the basic photometric values and required instrumentation needed to measure them. The focus of the work is concentrated on the description of the problems associated with setting the correct luminance of digital photography. It describes the dependency and correction procedures for calculating fixed luminance ratios of the individual images. The last part of this thesis is devoted to the possible use in practice, especially in the analysis of luminance of objects, luminaires and light sources. It also deals with an alternative description of luminaire and light sources to replace the luminous intensity curve etc.

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Clark, Jerremy Eugene. „Nighttime driver needs: an analysis of sign usage based on luminance“. Texas A&M University, 2003. http://hdl.handle.net/1969.1/5959.

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The need to see traffic signs at night has led to the development of increasingly brighter retroreflective sign sheeting. The impact of this increased brightness has been shown to increase the legibility distance of the sign, but at what cost? With brighter signs being visible from farther away, there is an increased opportunity for the driver to look at the sign. This thesis assesses the impact of sign brightness on the nighttime driverÃ¢ÂÂs sign viewing behavior; such as the number of glances and the total glance duration directed at the sign. Eye-tracking technology has been used to follow the nighttime driverÃ¢ÂÂs eye movements through tasks based on sign usage. The six signs used for the analysis are classified in three relative brightness categories of bright, medium, and dim on a closed course and on a public road. Data relating to the beginning and end of each glance were recorded as well as the distance at which the sign became legible to the driver. Comparisons were made between the three brightness levels for the number of glances, total glance duration, and legibility distance of the sign. Further analysis was conducted to determine the effect of the testing environment on a driverÃ¢ÂÂs sign viewing behavior by comparing the results from the closed course with those from the open road. The data for this thesis show varying results between the two courses with more defined differences based on luminance for the open road. The results of this thesis indicate that drivers do not consistently change the number of times they look at a sign or the amount of time dedicated to a sign based on its brightness. During real world driving scenarios, the brightest sign resulted in the longest legibility distance and the lowest total glance duration, indicating an increased efficiency reading the sign by the driver. Typically, a sign with a longer total glance duration had a shorter legibility distance. Comparisons between the closed and open courses revealed that open road driving resulted in a longer total glance duration and a shorter legibility distance.

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Persaud, Steven S. „Contrast Sensitivity to One- and Two-Dimensional Luminance Patterns“. Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/9910.

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Contrast sensitivities to one- and two-dimensional luminance patterns were compared in a two-alternative forced choice (2AFC) experiment. Space-averaged luminance was also manipulated. Statistical analyses revealed a main effect of stimulus dimension (p < .05) and no effect of space-averaged luminance. The main effect of stimulus dimension was explained in terms of an on-center, off-center receptive field model combined with watershed spatial vision behavior at spatial frequencies below 1 cycle-per-degree (cpd). The non-significant result for space-averaged luminance was explained by the limited range of manipulation of the variable. Two-dimensional luminance patterns were suggested as ideal patterns for reconciling grating-based spatial vision research with spatial vision behavior in an ecological context. Future research directions are suggested.
Master of Science

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Svoboda, Miloslav. „Srovnání konvenčních a nových metod měření a hodnocení jasů“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219397.

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Because luminance is the only value to which our sight responds, its measurement becomes important in terms of ensuring the proper function of vision. Nowadays luminance measuring can be made by conventional methods, such as direct using of luminance meter. However an entirely new method of measuring luminance levels is coming. This method is based on using luminance analyzers which work using a digital photography for the analysis of luminance. This thesis deals with these issues and is divided into several chapters, which form the two main parts of the thesis, the theoretical and the practical one. The theoretical part of the thesis deals with the basics of lighting technology, as well as the principles of measuring the luminance using conventional methods. New methods of measurement, i.e. using luminance analyzers, are discussed in two chapters which analyse both the principle and characteristics of analyzers available today. In the practical part is a comparative measurement carried out – in the laboratory and in terrain – using both methods.

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Ševčík, Ondřej. „Jasové skenování svítidel a světelných zdrojů“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219906.

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Práce se zabývá měřením křivek svítivosti světelných zdrojů a svítidel konvenčními a nekonvenčními metodami. Úvodní část práce je věnována popisu zrakového systému a základních fotometrických veličin. Hlavní teoretická část je zaměřena na popis současných metod měření křivek svítivosti a nových metod měření pomocí jasového analyzátoru. Současně jsou pro jednotlivé metody uvedeny zdroje nejistot, které ovlivňují výsledky měření. Těžiště práce spočívá v návrhu metodiky měření křivek svítivosti z jasových skenů svítidla a následném ověření tohoto postupu vlastním měřením. Dále bylo provedeno srovnání naměřených výsledků navrženým postupem, s výsledky konvenčního měření na goniofotometru s luxmetrem.

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Luet, Mathieu. „Elaboration de deux spectromètres par transformée de Fourier utilisant des matériaux biréfringents : un spectro-polarimètre et un spectro-imageur“. Paris 11, 2006. http://www.theses.fr/2006PA112253.

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Ce travail de thèse porte sur l’étude et la réalisation de deux spectromètres à transformée de Fourier utilisant des matériaux biréfringents. Le premier est un spectromètre statique utilisant une configuration innovante, à base de lame de Savart associée à une optique de Fourier. Il est destiné à la mesure de luminance spectrique de sources homogènes et il peut être transformé en spectro-polarimètre moyennant l’ajout d’une simple lame à retard en rotation. Le deuxième appareil est un imageur spectral construit autour de deux prismes de Wollaston dont l’un est mobile, en translation par rapport à l’autre. Il permet de faire l’image, en luminance spectrique, d’objets étendus avec une résolution spatiale pouvant aller jusqu’à 1000x1000 points. Dans les deux dispositifs, la mesure repose sur l’enregistrement d’un certain nombre d’images, constituées de franges d’interférence localisées sur une matrice de détecteurs et permettant de constituer un ensemble d’interférogrammes à partir desquels est appliqué un traitement de signal adapté (par transformée de Fourier) pour déterminer la luminance spectrique recherchée. Dans le spectro-polarimètre, chaque image constitue un interférogramme spatial, construit à partir de tous les détecteurs élémentaires. Dans l’imageur spectral, chaque pixel donne lieu à un interférogramme propre, qui est construit séquentiellement dans le temps, au fur et à mesure du déplacement du cube mobile. La résolution spectrale obtenue est de l’ordre de 5nm pour des domaines d’applications portant sur la qualité colorimétrique des écrans plats et l’analyse spectrale des pigments de peinture dans les œuvres d’art
New Fourier-Transform Spectrometers are carried out using birefringent materials. The first one is a static spectro-polarimeter using a calcite-made Savart plate with a Fourier optics. It is dedicated to measure the spectral luminance distribution and the polarization state of any homogeneous surface. The second instrument is a hyper spectral imager based on two symmetric fluorine-made Wollaston prisms, one moving linearly towards the other. It gives the spectral luminance distribution of an extended source up to 1000x1000 points. In both systems, the spectral information is extracted from interferograms, after a dedicated Fourier transform computation. In the polarimeter, the interferogram is spatially obtained on a two dimensional camera whereas, in the spectral imager, each pixel of the camera has its own interferogram, temporally constructed with the movement of the Wollaston cube. The spectral resolution achieved is about 5nm in the visible range and the instruments are well adapted for flat panel displays quality test and pigment painting detection

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Sivakumar, Praveen. „Analysis of Electron Transport and Luminance Mechanisms in SrS Based Blue Emitting ACTFEL Devices“. UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_theses/243.

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The purpose of this thesis is to contribute to the understanding of SrS based ACTFEL devices. Better understanding of the processes in the host phosphor will give us the possibility to design more efficient blue emitting ACTFEL devices. Towards this aim, a physical model, that describes the optoelectronic processes taking place in the phosphor, was developed and analytical equations were written. The analytical model was numerically simulated and the plots of flux flowing through the device and luminance output by the device were obtained. Experiments were performed to obtain the plots of current flowing through the device and luminance output by the device. These plots were then qualitatively compared and the results of comparisons are presented. The numerical simulations qualitatively verify the accuracy of the model. The drive parameters were varied in order to study its effect on the VIL characteristics of the device. On varying the voltage applied to the device and its rise and fall times, a good insight was obtained into device behavior. Simulations were also performed to obtain responses to qualitatively match the experimentally obtained responses. Various What-If scenarios have been studied by varying the device parameters. These studies have indicated the importance of these parameters in determining device performance.

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Brusque, Corinne. „Métrique du bruit visuel en site urbain nocturne pour l'optimisation des signaux routiers“. Saint-Etienne, 1994. http://www.theses.fr/1994STET4006.

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Les scènes urbaines, en raison de la richesse de leur contenu, présentent l'inconvénient de générer un flux d'informations visuelles qui sollicite en permanence le système visuel de l'automobiliste. On identifie, sous la terminologie de bruit visuel, la nuisance générée par un tel environnement pour détecter les signaux routiers. L'objectif de la thèse est la définition d'une métrique, automatique et objective, du bruit visuel des scènes urbaines nocturnes. On a fait l'hypothèse qu'il était possible d'estimer l'intensité du bruit visuel généré, par un environnement urbain nocturne, à l'aide d'un paramètre physique quantifiant sa complexité visuelle. On a recherché, parmi les techniques de traitements d'images, celles qui permettaient au mieux d'estimer la complexité visuelle d'un environnement urbain. Les méthodes suivantes de traitement d'images ont été étudiées : l'analyse de l'histogramme des luminances, des techniques d'analyse de texture et l'analyse par ondelettes. On a, également, proposé une méthode, inspirée du calcul de la luminance de voile, pour décrire la répartition radiale de zones à forte luminance autour du signal. Une méthodologie statistique associant l'analyse factorielle et l'analyse typologique, a été retenue pour comparer le pouvoir de discrimination de la complexité visuelle, offert par chacune de ces méthodes. La métrique du bruit visuel proposée regroupe l'ensemble de ces outils. On a ensuite validé l'hypothèse initiale en comparant l'évaluation subjective, par des observateurs, du niveau du bruit visuel généré par un environnement et l'évaluation objective et automatique proposée

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Bücher zum Thema "Luminance analyser"

Ltd, ICON Group. LUMINANT WORLDWIDE CORP: International Competitive Benchmarks and Financial Gap Analysis (Financial Performance Series). 2. Aufl. Icon Group International, Inc., 2000.

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Ltd, ICON Group. LUMINANT WORLDWIDE CORP: Labor Productivity Benchmarks and International Gap Analysis (Labor Productivity Series). 2. Aufl. Icon Group International, Inc., 2000.

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Buchteile zum Thema "Luminance analyser"

Du, Zhenlong, Xueying Qin, Wei Hua und Hujun Bao. „Salience-Preserving Image Composition with Luminance Consistency“. In Advances in Machine Vision, Image Processing, and Pattern Analysis, 308–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11821045_33.

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Pinho, Armando J., und António J. R. Neves. „On the Efficiency of Luminance-Based Palette Reordering of Color-Quantized Images“. In Pattern Recognition and Image Analysis, 766–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-44871-6_89.

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Cibis, Gerhard, Melanie Crandall, Valeriy Pruzhanovskiy, Judith Lynd und Timothy Hug. „Color and Luminance: A 24 Bit Analysis of Eccentric Photorefraction Combined with the Brückner Red Reflex (VVDA)“. In Documenta Ophthalmologica Proceedings Series, 93–95. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5698-1_11.

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Konferenzberichte zum Thema "Luminance analyser"

Sumec, Stanislav, Jan Skoda, Petr Baxant und Michal Krbal. „Realtime Luminance Analyse“. In 21st International Conference LIGHT SVĚTLO 2015. Brno: Fakulta elektrotechniky a komunikacnich technologii VUT v Brne, 2015. http://dx.doi.org/10.13164/conf.light.2015.277.

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Fujimoto, Takaya, Kenji Yamashita, Satoshi Nishida, Daiji Noda und Tadashi Hattori. „Fabrication of High Performance Light Guide Plate and New Design for High Luminance“. In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40326.

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Recently, LED (Light Emitting Diode) is paid to attention as a new source of light. However, it doesn’t turn to shine on a wide area efficiently because LED is a point light. Then, the method of the light guide plate technology used for the liquid crystal display etc, and use as the LED lighting is examined. A minute reflection dots exists bottom of the light guide plate, system is such that light comes out from the surface because the light that hits the dots break a total reflection condition. In our laboratory, the function of the diffusion seat and the condensing prism seat that is complete parts of the lighting panel was involved by optimizing shape and the arrangement of the dots, and it works on the research of the light guide plate where uniform luminescence is enabled. In the process of study, it has been understood that luminance increases by increasing the number of dots, too. Therefore, an accumulating method of piling up two or more light guide plates was proposed as a method of achieving high luminance for highly effective lighting usage, and the device was analyzed with an optical simulator. As a result of optimization, the average luminance has improved by 15%. We are starting to fabricate this high luminance light guide plate by accumulating method. If this piled light guide plate is completed and luminance is improved in accordance with the simulation, it will be possible to convert it to a higher luminance light guide plate.

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Lin, Ku Chin. „Freeform Lens Design for Illumination with Different Luminance Intensities“. In Adaptive Optics: Analysis, Methods & Systems. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/aoms.2015.jt5a.4.

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Giraldo, Diego Garcia, und Ronald W. Yeung. „The 2010 Oil Spill in the Gulf of Mexico: Flow-Rate Estimation Based on Satellite-Images Analysis“. In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78717.

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The Deepwater Horizon Mobile Offshore Drilling Unit (MODU) was one of several classes of floatable drilling machines. The explosion on April 20, 2010 led to the worst ecological disaster with regard to oil spills in the USA. The objective of this paper is to develop a logical and independent estimate of the oil flow rate into the Gulf of Mexico produced by the rupture in this rig. We employed the NASA Moderate Resolution Imaging Spectroradiometer (MODIS) satellite photographs [1] starting from the days immediately following the disaster to determine the size and intensity of the oil spill. From these images, we obtained the surface area of the oil spill and calculated the oil flow rate by two different methods based on contrasting luminance within the area. The first assumes a constant thickness for the total area with upper and lower bounds for the thickness. The second method separates the spill area into different patches, based on the luminance levels of each. It was found that the probability density function (PDF) of the luminance plots typically showed some natural grouping, allowing patches to be defined. Each patch maps to a specific thickness and the result of the addition of all the patches provides a more accurate average thickness of the spill. With the assumption that evaporation and other loss amounted to 40% of the spill, we obtained, as a result of this analysis procedure, a minimum flow rate of 9,300 barrels per day and a maximum of 93,000 barrels per day using the first method. A value of 51,200 barrels per day was obtained using the method based on patch separation. This latter estimate was a reasonable value obtained based on this relatively simple method but with no details presented in an Extended Abstract in OMAE2012 [4]. It is remarkably consistent with the “official US-Govt. estimates” of [2, 3].

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Carbol, Zbynek, Barbara Helstynova, Karel Sokansky und Tomas Novak. „Measurement and analysis of disruptive glare UGR method by using luminance analyzer“. In 2014 15th International Scientific Conference on Electric Power Engineering (EPE). IEEE, 2014. http://dx.doi.org/10.1109/epe.2014.6839486.

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Varmuza, Jan, Michal Krbal und Karel Katovsky. „Cherenkov glow analysis by Luminance Distribution Processing“. In 2014 15th International Scientific Conference on Electric Power Engineering (EPE). IEEE, 2014. http://dx.doi.org/10.1109/epe.2014.6839513.

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Estermann, Colin, Walter Stechele, Robert Kutka und Andreas Hutter. „Luminance Correction in Stereo Correspondence Based Structure from Motion“. In 2008 Ninth International Workshop on Image Analysis for Multimedia Interactive Services. IEEE, 2008. http://dx.doi.org/10.1109/wiamis.2008.62.

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Qingkun Su, Yan Huang und Jingliang Peng. „CoLDImage: Contrast and luminance distribution for content-based image retrieval“. In 2011 International Conference on Image Analysis and Signal Processing (IASP). IEEE, 2011. http://dx.doi.org/10.1109/iasp.2011.6109015.

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Menon, Daniele, und Giancarlo Calvagno. „Demosaicing Based Onwavelet Analysis of the Luminance Component“. In 2007 IEEE International Conference on Image Processing. IEEE, 2007. http://dx.doi.org/10.1109/icip.2007.4379122.

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Haddadi, Souad, und Christine Fernandez-Maloigne. „Luminance and texture variation analysis for motion detection“. In Photonics West '98 Electronic Imaging, herausgegeben von Sarah A. Rajala und Majid Rabbani. SPIE, 1998. http://dx.doi.org/10.1117/12.298312.

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Berichte der Organisationen zum Thema "Luminance analyser"

Kramer, Robert. LED Street Lighting Implementation Research, Support, and Testing. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317274.

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This report describes the results of technical analysis, field tests, and laboratory tests that were performed for LED highway lighting options by the Energy Efficiency and Reliability Center (EERC) at Purdue University Northwest for the Indiana Department of Transportation (INDOT). This effort was conducted over the past 3 years to evaluate and test the technology and viability of using modern highway lighting technology to enhance energy efficiency, safety, security, and economic development of communities and roadways. During the testing period there was a continuous discussion between INDOT and EERC regarding the laboratory and field testing of INDOT approved luminaires submitted by vendors. There were multiple discussions with INDOT and vendors regarding the individual details and issues for the 29 luminaires that were tested. A comparison study was conducted by EERC of the various alternatives and comparison to currently installed luminaires. Data was collected for field tests of the luminaires by EERC and INDOT personnel for the luminaires. Field data was evaluated and compared to lighting models using vendor supplied ies data files. Multiple presentations were made at 3 separate Purdue Road Schools regarding the results and procedures of the testing program by EERC in conjunction with INDOT. A total of 22 final reports, considered confidential by INDOT, for individual vendor luminaires have been prepared as part of this effort. These reports were submitted sequentially to INDOT as testing was completed during the course of this effort. A total of 29 luminaires were tested. Some luminaire testing was terminated during testing due to design issues or vendor requests. All testing was summarized in the INDOT specification sheet attached to each report. Observations regarding the consistency of the supplied test luminaire with the requirements of Section 7.2 of the INDOT test procedure “Procedure for evaluation and approval list requirements for solid state ballasted luminaires ITM 957-17P” is provided in the Appendix to the report for each luminaire. Details regarding how these tests were performed and the respective associated evaluation of performance and reliability are provided in the report. This effort included: consideration of published and vendor information; appraisal of products consistent with national industry standards; review of physical design, thermal performance; laboratory testing of photopic performance, reliability, life cycle data and characteristics, and power characteristics; technical and probabilistic risk studies; and field testing and analysis of LED light sources including comparison to currently installed conventional light sources. Assistance in preparing INDOT standards for highway lighting was provided on multiple occasions.

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