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Dissertations / Theses on the topic 'Illumination intensity'
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1
Tyburski, Robin. "Investigating the illumination intensity dependence of the kinetic behaviour of charge recombination in a p-type dye sensitised solar cell." Thesis, Uppsala universitet, Institutionen för kemi - Ångström, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-202092.
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He, Weiyi. "Optical Design of Beam Shaping Optics for Camera Probe and LED Light Illumination Used for Minimally Invasive Abdominal Surgery." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3532.
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The optical design of a LED illuminator and camera imaging system were studied for potential use in a small medical "robotic type" probe to be used for minimally invasive abdominal surgery. Beam shaping optical reflectors were studied to increase the intensity distribution of the LED beam directed toward a close-by target surface. A CMOS/CCD camera and lens was used to image the targeted area. In addition, extensive optical ray tracing simulations were made to predict the intensity patterns. The experimental measurements and ray tracing simulations were in good agreement, and indicated that 20 degree cone reflectors for the LED sources and appropriate micro-lens/CCD chip imaging optics should provide a useful image at a working distance of about 5 cm.
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Tomeš, Martin. "Simulace LED náhrad v reálných podmínkách." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220695.
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This Master’s Thesis on Simulation of LED retrofits under operational conditions is divided into theoretical and practical part. Theoretical part in the introductory section deals with the concepts of lighting technology and presents some electric light sources, such as classic bulbs, halogen bulbs, linear and compact fluorescent lamps. It also describes the principle of electroluminescent light sources (LED), which discusses principles of yielding a white light, the main advantages of LED etc. The reader is familiar with the issue of compensation the linear fluorescent lamps tubular LED source and with the work environment programme ReluxPro that is used for design of the lighting system. Practical part of the thesis is divided into two chapters. In the first chapter, measured linear fluorescent lamps and LED modules for the light-technical parameters, luminous intensity, radiation spectrum and settling time of light sources are evaluated and compared. The second chapter is solved by using ReluxPro, which explores the impact on the lighting and the brightness of the room layout SA 5.10 while using various light sources. In conclusion, there is an economic aspect of linear fluorescent lamps and LED modules analyzed. Results from the program ReluxPro are continuously compared with real measured values.
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Balharová, Gabriela. "Možnosti osvětlení vozidel pro zvýšení bezpečnosti silničního provozu." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-232650.
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This master’s thesis deals with the possibilities of illumination of motor vehicles. Thesis is divided into two sections, from which the first discusses precisely the possibilities of lighting of motor vehicles at the present time. What are the modern lighting techniques, that can be found on the market and what is their impact on safety enhancement in road traffic. Second section is about the practical measurement of low and high beam afterglow. This measurement is being compared between two types of headlamps, namely halogen headlights and xenon headlights. Part of the measurement is as well measurement of illumination intensity precisely for these headlights. The output of measurement is the creation of own illumination intensity diagrams and afterglow diagrams of particular headlights, in comparison to isolux diagrams provided by the headlights manufacturer. Consequently are solved the issues about utilization of the isolux diagrams in expert praxis.
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Maxera, Pavel. "Porovnání výsledků experimentálních měření dohlednosti s dostupným SW." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-232646.
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This master's thesis deals with the analysis of comparison the results of experimental measurements of visibility with the software Dohľadnosť 2.0. Based on the specifications obtained by measuring in the field evaluates, whether the results acquired from the software by simulating an identical situation are consistent and therefore applicable for an expertise activities in solving the analysis of road-traffic accident.
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Pavelka, Adam. "Numerické modelování zdrojů světla." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219144.
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The master’s thesis deals with photometry units used in light engineering. There are defined the methods of modelling the illumination systems, their advantages, disadvantages and possibilities of using. Furthermore, the thesis deals with modelling of two illumination systems by ray-tracing in programming environment of MATLAB. The master’s thesis describes the analysis of the problem and the program designing process. Acquired model results are then compared with the real measurements of both illumination systems which allow the discussion of the results and the deviations of the models.
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Shen, Yu-Ling, and 沈郁玲. "The study of InGaN illumination intensity affected with post annealing environment." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/91758721515728842465.
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碩士國立中山大學
材料科學研究所
90
We will add AlN and InN powder in order to change the post annealing environment. We want to understand the quality and optical properties of InGaN/GaN quantum well undergoing post annealing.
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Hsiao, Wei-Yun, and 蕭為允. "An Autonomous Obstacle-Avoidance Vehicle System based on Image Detection using Illumination Intensity." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/93827616645663691096.
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碩士中原大學
電子工程研究所
101
The automation of autonomous mobile vehicle (AMV) must rely on a well-designed system operations, including obstacle detection, path planning and motor control. For obstacle detection, a previous work proposed a sensing method based on light intensity, where a single visual sensor along with a concentrated LED flashlight is used to achieve the objective of obstacle avoidance and distance estimation. In that method, a series of image pre-processing steps are adopted to capture the characteristics of reflection light obtained from the LED light source. Once the system identifies one and only one characteristic light source for a period of time, the system has detected an obstacle. However, it is not robust because the success of capturing characteristic light source highly depends on the material property and textures of the obstacle. According to that method, this thesis proposed a method to fix the potential problem of broken pieces of characteristic of the light source. By testing based on a new data set consisting of different materials and textures of obstacle, the proposed method is shown to be more robust and stable than the previous work because the statistic kappa value is pushed up significantly from 0.22 to 0.64. A regression analysis based on 40 experimental data is used to find a distance estimation equation and parameters in the distance estimation experiment. The proposed method and the laser image oriented methods called IBDMS and IBDAMS are compared in terms of the accuracy of distance estimation. The advantages and the disadvantages between IBDAMS and the proposed method are listed so that users can choose the visual system according to their needs. The applicable distance range with the proposed method is from 10 cm to more than 200 cm and the resulting absolute average error rate is 3.84%. The error rate is small enough to meet the requirement for the AMV in obstacle avoidance applications. Finally, the proposed method and a simple obstacle avoidance strategy is embedded in an AMV and a obstacle avoidance experiment is conducted to demonstrate the practical value of the proposed system.
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Qiu, Zhong-Yi, and 邱仲毅. "Nighttime License Plate and Human Face Recognition Based on Multi-Intensity IR Illumination." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/03623880047711188464.
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碩士國立交通大學
資訊科學與工程研究所
104
Nighttime video surveillance has become more and more popular. License plate recognition and face recognition are two important applications in nighttime video surveillance. However, nighttime videos are unclear due to insufficient illumination at far distance, overexposure at near distance and backlight situation. To solve these problems, we adopt a new multi-intensity infrared illuminator as a supportive light source to provide multiple illumination levels. Because there are imaging results with multiple intensities, analyzing and integrating these results is the purpose of this thesis. Experiment results show that multi-intensity infrared illumination can indeed improve the performance of license plate recognition and face recognition.
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Huang, Ren-Hong, and 黃任宏. "An Image Detection System based on Illumination Intensity for Obstacle Avoidance of Autonomous Vehicles." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/35165453308557551643.
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碩士中原大學
電子工程研究所
99
In the development of autonomous mobile vehicle (AMV), the precise automated actions must rely on a well-designed operating system, which includes motor control, path planning and obstacle detection. This thesis presents a sensing system for the obstacle detection of AMV. The system can detect the existence of an obstacle and estimate the distance between the AMV and the obstacle. This study presents a vision-based sensing approach, without the need of processing the highly complex environment of stereo imaging. Instead a single visual sensor with a directional front concentrating LED light is used to detect obstacles and estimate the distance. In the obstacle detection experiment, an image pre-processing step is adopted to capture the characteristics of a light reflection source obtained from the LED light. When only one light reflection characteristics is identified for a period of time, the system determines that the obstacle exists. The accuracy, sensitivity, specificity, and confidence level are used to evaluate the detection capability of the system for various obstacle conditions, where the confidence level reflects the trustworthiness of the proposed system. The proposed system got a confidence level of 0.67, which shows good credibility. When the obstacle has an irregular surface, the system can overcome the detection difficulty for a single pointing and over-directional sensor (e.g. laser and infrared sensor). In the distance estimation, a standard experiment environment is built for the comparative study between a regression analysis approach and TaE (Trial and Error). A curve fitting result from 50 experimental data is used to estimate the distance formula and parameters. The experiment shows that the regression analysis approach has -1 % of average error rate, while TaE has -1.08%. The error rate is small enough to meet the demand for the AMV in obstacle avoidance applications.
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LEE, ZONG-YAN, and 李宗彥. "Study on AZO/IGZO Transparent Conductive Thin Film for Dye-sensitized Solar Cells with Photoelectric Characteristics and Impedance Analysis under Low Intensity Illumination and Series-parallel Modules." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/remx55.
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碩士國立雲林科技大學
電子工程系
106
In this thesis, the InGaZnO4 (IGZO) film is sputtered on the glass substrate as a buffer layer, and then the Al-doped zinc oxide (AZO) thin film is deposited onto the glass substrate with buffer layer as the transparent conductive oxide (TCO). By using radio frequency (R.F.) sputtering, 4-point probe and alpha-step profiler, the best process parameters are investigated and characterized. The experimental result shows that the optimal electrical resistivity of AZO TCO film is 2.6×10-3 Ω-cm. In addition, the optimal electrical resistivity of AZO/IGZO TCO film, in that the IGZO buffer layer was introduced, decreases to 9.4×10-4 Ω-cm, and the transmittance is over 80% in the visible wavelength range. Then, the dye-sensitized solar cells (DSSCs) are fabricated using the AZO/IGZO TCO glass. The analysis are carried out by using a simulated solar source, quartz filters and electrochemical impedance spectroscopy (EIS). The experimental result shows that the photoelectric conversion efficiency of DSSC with AZO/IGZO TCO film under the illumination of AM 1.5G (100 mW/cm2) is 3.71%, which has a significant improvement when compared to the photoelectric conversion efficiency 3.02% of the DSSC with AZO TCO film. Under the low-intensity illumination of 1.75 mW/cm2 (T5), the photoelectric conversion efficiency of AZO/IGZO DSSC is up to 6.89%. For practical applications, the DSSCs are further fabricated in the forms of series and parallel modules. The resultant DSSCs modules were analyzed to measure the change of current and voltage by using EIS and solar simulator.
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姚柏安. "Nighttime Face Detection Using Multi-Intensity IR Illuminator." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/63756233294617277752.
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碩士國立交通大學
多媒體工程研究所
100
In nighttime video surveillance, the image details of far objects are often hard to be identified due to poor illumination conditions while the image regions of near objects may be whitened due to overexposure. To alleviate the two problems simultaneously for nighttime video surveillance, we adopt a new multi-intensity infrared illuminator as a supportive light source to provide multiple illumination levels periodically. By using the illuminator with multiple degrees of illumination power, both far and near objects can be clearly captured. In this thesis, an effective algorithm is developed to pick out high quality human faces from nighttime video sequences. Experiment results show that well exposed face images can be automatically detected and selected for people located at various distances from the camera.
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Hsu, Shun-Yuan, and 許順淵. "Automatic calibration for synchronized multiple-Intensity IR-illuminator." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/gued6g.
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碩士國立交通大學
電機學院電信學程
101
In nighttime surveillance, there is usually not enough natural ambient light for image capturing, and an IR illuminator is often used to partially resolve the problem. However, improper intensity/location of an illuminator may result in object images which are too dark or bright so that image quality is not satisfactory even for human perception. Using multiple-intensity IR-illuminator can produce a number of different light intensities to help the generation of images with different degrees of exposure, from which well-exposed images can be chosen, and increase the number of good quality images. The goal of this thesis is to develop an automatic calibration method for a synchronous multiple-intensity IR-illuminator, which may be used in different environments for capturing images of objects at various locations, so that quality images, e.g., those with good contrast, will be included in the images captured with selected illumination intensities. In other words, by reducing the number of improperly illuminated images, more informative images (and more useful image analysis results) can be obtained. Experimental results shows that the proposed automatic calibration method can indeed achieve the above improvement for the performance of automatic face detection. Potential applications which may also benefit from such calibration include license plate identification, image integration for a high dynamic range (HDR) representation …etc.
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Chen, Yi-Ting, and 陳怡廷. "Nighttime License Plate Detection Using Multiple Intensity IR-illuminator." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/20410174911142556913.
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碩士國立交通大學
多媒體工程研究所
99
The goal of this thesis is to enhance the visibility of the images of license plates at far distances, and to reduce the over-exposure defects for similar images taken near a camera with an illuminator with fixed intensity, by applying an innovative, multi-intensity IR illuminator for night-time video surveillance. Based on an analysis of the stroke width of characters of the license ID, license plates at various distances can be detected under different illumination intensities. Since images obtained with different illumination conditions may contain useful information for different regions interest, best images of license plates are identified for each illumination condition and integrated into a high dynamic range (HDR) representation for easy inspection and examination. Experimental results show that the proposed approach can increase the monitored area both in depth and in width, and enhance the security level of night-time surveillance.
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Sung, Meng-Che, and 宋孟哲. "Foreground Extraction for Night Surveillance Using Multi-intensity Infrared Illuminator." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/50849909963212578704.
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碩士國立交通大學
資訊科學與工程研究所
103
In nighttime video surveillance, proper illumination plays a key role for the image quality. For ordinary IR-illuminators with fixed intensity, faraway objects are often hard to be identified due to insufficient illumination while nearby objects may suffer from over-exposure, resulting in image foreground/background of poor quality. In this thesis we using a multi-intensity IR-illuminator to generate images with different illumination levels. After that, foreground extraction, channel selection and some processing will be execute. First, a GMM-based foreground extraction procedure is adopted for images acquired under each illumination level. With quality assessment of the outcome of such procedure, the system than selects visually most plausible foreground regions from different illumination levels to generate a set of new input data. After that, processing the edge of the foreground object with refinement and remove the unnecessary part. Finally, output a new video with the most plausible foreground object after the selection.
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Wong, Jung-Li, and 翁仲立. "A Nighttime Surveillance System Using A Synchronous Multi-intensity Infrared Illuminator." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/94149498767889302045.
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碩士國立交通大學
資訊學院資訊學程
101
This study involves a new technique which improves the image quality of nighttime surveillance. According to the previous design [1], with a multi-intensity infrared illuminator, high dynamic range images can be captured by the nighttime surveillance system. The illuminator offers variable infrared intensity to illuminate the objects or humans at different distances. Therefore, the details of the images can be retained. Since the controllers of multi-intensity infrared illuminator system and nighttime surveillance system are independent, image foregrounds at different distances must be obtained from an additional luminance clustering technique for CCD cameras. For the CMOS cameras, the local luminance of one single frame may not correspond to the same luminance level, which will reduces the accuracy of luminance clustering and increases the complexity of analysis. This study presents a new system design that uses the only one system controller to synchronize the illuminator and the exposure timing. This structure will save the hardware cost and solve the inconsistent luminance problem of the previous design [1].
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盧沛怡. "Nighttime Surveillance System for Human Detection Using Multiple Intensity IR-illuminator." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/68589737739007421397.
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碩士國立交通大學
多媒體工程研究所
100
In nighttime video surveillance, far objects are often hard to be identified due to poor illumination conditions while near objects may be whitened due to over-exposure. Therefore, we used a multiple intensity IR-illuminator that provides multiple illumination levels periodically as a supportive light source. By using the IR-illuminator, images with different degrees of exposure can be obtained. Accordingly, we can detect far human correctly and display near face clearly in the meantime, which is better than using fixed illumination. We analyze multiple intensity videos and propose three foreground detection methods. The first two methods can extract foreground regions by illumination clustering, which can find the period of illumination variation automatically. The third method, based on a periodic min-max model, has lower computational complexity and real-time performance and does not require illumination clustering. Experimental results show that the first and the third methods can achieve more than 90% of average accuracy in foreground object detection for various test videos.
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Xu, Meng-Yi, and 徐孟義. "A Design on the Dimmable Circuit and the Control of Illuminating Intensity Simulation in a Impedance Measurement Platform for Botanical Tissue." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/55452016854960618684.
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碩士國立中興大學
生物產業機電工程學系所
98
This research establishes illumination simulation system for the non-invasive botanical impedance measurement platform. A developed dimmable circuit and the rearrangement of fluorescent trigger circuit in the platform linked together consist of this illumination simulation system. Integrating with the control on temperature and humidity, the expected environmental conditions including the sunshine illumination, temperature and humidity for botanic physiology measurement can be implemented. Many literatures confirm that various wavelengths of light will resulted in different responses on the physiology of a plant. The products from photosynthesis processes in a plant vary with segments of light spectrum absorbed. Therefore, a sturdy plant must grow with full spectrum of illumination. Since the popular and energy-saving illumination source- LED is with single specific wavelength and not can satisfy the full spectrum requirement for the photosynthesis processes, this approach chooses dimming fluorescent light source as illumination device. For illumination simulation, the illumination values in a greenhouse is the specification of the developed system. For realization, the dimming light circuit adjusts the amplitude, the angle, and the frequency etc as illumination control. In this research it is verified that the dominant factor for illumination control is the load power, thus the dimming light system developed will be accomplished by implementing the amplitude adjustment. This research also compared the spectrums of three -wavelength fluorescent lamps and the normal fluorescent tube. In addition, A friendly interface developed by LabVIEW programming is employed with the hard ware NI PXI system and the integrating circuit is layout as a PCB board to facilitate and accomplish the non-invasive impedance measurement system with illumination, temperature and humidity control . Ultimately, the results from the real-time and on-line system operation for Phalaenopsis with specific environmental factors: illumination, temperature and humidity validate the effectiveness, practicability and applicable prospect of this developed non-invasive botanical impedance measurement platform.