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Dissertations / Theses on the topic 'Reduction of noise'

Author: Grafiati
Published: 9 November 2024
Last updated: 19 July 2025

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1

Robert, Rene Jean. "Measuring noise level reduction using an artificial noise source." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54480.

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Buildings located near airports may be subjected to significant noise levels due to aircraft flyovers. Aircraft noise is particularly annoying when compared to other traffic noises due to its intermittent nature. While noise control is typically performed at the source, sound insulation programs are in place to improve the acoustic performance of a residence affected by the flyovers. Noise Level Reduction (NLR) is a common metric used in the United States to determine whether a residence qualifies for such programs. Sound insulation programs are available to houses that have an indoor Day Nigh
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2

Kalyoncu, Ozden. "Noise Reduction In Time-frequency Domain." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608768/index.pdf.

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In this thesis work, time-frequency filtering of nonstationary signals in noise using Wigner-Ville Distribution is investigated. Continuous-time, discrete-time and discrete Wigner Ville Distribution definitions, their relations, and properties are given. Time-Frequency Peak Filtering Method is presented. The effects of different parameters on the performance of the method are investigated, and the results are presented. Time-Varying Wiener Filter is presented. Using simulations it is shown that the performance of the filter is good at SNR levels down to -5 dB. It is proposed and shown that the
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3

Su, Hongjiang. "Shoeprint image noise reduction and retrieval." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486207.

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A shoeprint is a mark made when the sole of a shoe comes into contact with a surfice. People committing crimes inevitably leave their shoe marks at the crime scene. A study suggests that footwear impressions could be located and retrieved at approximately 35% of all crime scenes. More and more shoeprint images have been collected, leading to a few of shoeprint image databases. The constantly increasing of the size of these databases leads to a problem that it takes too much time to classify or retrieve them manually. In addition, when a shoeprint is actually being made, distortion, capture dev
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4

Bace, Matthew M. (Matthew Mark). "A receiver-compatible noise reduction system." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/116488.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.<br>Includes bibliographical references (leaves 111-113).<br>by Matthew M. Bace.<br>M.S.
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5

Read, Simon John. "Noise reduction technologies for open rotors." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608127.

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6

Haglund, Philip. "Noise reduction solutions for compact dishwasher." Thesis, KTH, Maskinkonstruktion (Inst.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-157658.

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Electrolux are currently developing a new kind of compact dishwasher, distinctly different from conventional dishwashers. A key concern that emerged through the development process was noise. The sound was characterized as loud and annoying. The goal of this thesis was to develop a mechanical design solution that would guarantee a noise level below 55 dBA. Initial tests reaffirmed the concern regarding noise. Noise was prevalent and the sound pressure level ranging from 58,8 to 59,8 was considered intolerable. Tests were performed in an acoustic lab to determine vibration source and noise fact
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7

Gruber, M. "Airfoil noise reduction by edge treatments." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/349012/.

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The general aim of this thesis is to investigate experimentally airfoil trailing edge noise reduction using various trailing edge geometries. The work presented in this thesis is part of the FP7 European Project FLOCON. This thesis focuses on sawtooth serrations and a detailed study is conducted in which thirty seven sawtooth trailing edges are tested for reducing the noise at various flow velocities and angles of attack. Broadband noise reductions of up to 5 dB are obtained below some critical frequency above which the noise is increased. The mechanisms by which the noise is changed in the pr
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8

Kaymak, Erkan. "Noise reduction and active noise control of high frequency narrow band dental drill noise." Thesis, Brunel University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445923.

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9

Zheng, Haosheng, and Kaichun Zhang. "Noise Analysis of Computer Chassis and Secondary Sound Source Noise Reduction." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18547.

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This article focuses on computer noise analysis and noise reduction processing. With the popularity of computers, people are increasingly demanding the comfort of using computers. Solving the noise problem of the computer case can make the working environment more comfortable. People working in a noisy environment for a long time can cause anxiety and the quality of work is not high. The main purpose of this paper is to analyse the characteristics of computer noise and to reduce the noise of the chassis through the secondary sound source. Through the comparison of the experimental and simulati
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10

Lariviere, Jeffrey P. "Transform-domain echo cancellation and noise reduction." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0016/NQ57614.pdf.

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11

Nuckolls, William E. "Fan noise reduction from a supersonic inlet." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-08222009-040447/.

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12

Chan, Henry H. Y. 1977. "Substrate coupling analysis and noise reduction methods." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33960.

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The trend of system-on-a-chip carries on the end of the VLSI era to fulfill the ever-rising demands of electronics industry. As system complexity increases, interconnect becomes the dominant factor over transistor sizes in determining the overall performance. Theoretically, systems-on-a-chip implementations eliminate most packaging interfaces to improve the system-level performance. Manufacturing cost is also reduced by integrating both analog and digital circuits using monolithic CMOS technologies. Unfortunately, substrate coupling is found to be a major obstacle for the advancement of system
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13

O'Sullivan, E. A. "Numerical noise reduction techniques in signal processing." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426583.

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14

El-Bardisi, Mansour Mohamed Mansour. "Reduction of wind turbine noise through design." Thesis, City University London, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332781.

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15

De, Stefano Antonio. "Wavelet-based reduction of spatial video noise." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342855.

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16

Hilkhuysen, Gaston. "Effects of noise reduction on speech intelligibility." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0676/document.

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On perçoit souvent la parole en présence de bien d’autres sons. Parfois les interférences sonores atteignent des niveaux tellement élevés que la parole devient inintelligible. Les méthodes de renforcement de la parole tentent de réduire les bruits ambiants, mais on en sait très peu sur l’effet qu’elles produisent sur l’intelligibilité de la parole. Cette thèse explore les effets des méthodes de renforcement de la parole, aussi appelées algorithmes de suppression du bruit, sur la l’intelligibilité.Après une brève introduction sur les notions de renforcement de la parole et d’intelligibilité, on
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17

Depuru, Mohan Nagendra Karthik. "Modelling jet noise reduction : chevrons and microjets." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708351.

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18

Smith, Corne J. "Feedforward active noise reduction for aircraft headsets." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/49761.

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Thesis (MScEng)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: Active noise reduction (ANR) is a method of cancelling acoustic noise in a defined enclosure. Two methods exist to implement ANR, they are the analog feedback method and the digital feedforward method. Commercial ANR systems employing feedback methods have been around since the 1980's. Feedforward methods have however only become practically implemental with the age of fast real time digital signal processing. In current systems, feedback ANR is used to attenuate broadband noise whilst feedforward methods are used to
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19

Alberts, Antonie Craig. "Phase noise reduction in a multiphase oscillator." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/66581.

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Oscillators are ubiquitous to radio frequency circuits, where frequency translations and channel selection play a central role in the analogue communications channel. Oscillators also form part of digital systems as a time reference. Typical heterodyne receivers require an intermediate frequency channel. The associated oscillators and variable filters can only be centred perfectly at a single frequency, and degrade performance at the boundaries of the channel. These circuits also require image-rejecting filters and phase-locked loops in order to enable down-conversion. The penalties for these
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20

Sagoo, Hardial S. "Reduction of noise levels in vaccum cleaners." Thesis, Aston University, 1988. http://publications.aston.ac.uk/15145/.

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The work described in this thesis is directed towards the reduction of noise levels in the Hoover Turbopower upright vacuum cleaner. The experimental work embodies a study of such factors as the application of noise source identification techniques, investigation of the noise generating principles for each major source and evaluation of the noise reducing treatments. It was found that the design of the vacuum cleaner had not been optimised from the standpoint of noise emission. Important factors such as noise `windows', isolation of vibration at the source, panel rattle, resonances and critica
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21

Gao, Qiang 1964. "Noise reduction techniques for holographic information storage." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282620.

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The effects of wavefront conditioning on the performance of holographic optical data storage systems is investigated. The physical origins of various noise mechanisms which degrade the SNR of the holographic storage are studied for the thin phase (DCG) and the photoreflective crystal (LiNbO₃) recording materials. Dependence of the noise on various system parameters such as focal length, pixel size, number of pixels and material parameters are studied. An algorithm is developed to design pseudorandom phase masks which can improve the signal-to-noise ratio for a given system. The noise reduction
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22

Dang, Dung Do. "Tuneable Diode Laser Absorption Spectroscopy with Optical Fiber : Noise Analysis and Noise Reduction." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13089.

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A prototype of a fiber based absorptionspectroscopy instrument is built. A single mode fiber pigtailDistributed Feedback laser (DFB) is used to scan a known$mbox{NH}_3$ absorption line near $1512nm$ ($6614cm^{-1}$). $2mm$diameter InGaAs PIN photodiodes are used to convert the light signalto electrical signals by use of special designed transimpedanceamplifiers. Laser modulation, coherent detection at twice themodulation frequency (second harmonic detection), other electronics,and digital signal processing are provided by Norsk Elektrooptikk.bigskip The DFB laser from NEL (NLK1S5EAAA) delivers
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23

Wheeler, Peter David. "Voice communications in the cockpit noise environment : the role of active noise reduction." Thesis, University of Southampton, 1986. https://eprints.soton.ac.uk/52281/.

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This thesis addresses the topic of voice communications in the cockpit noise environment of modern `fast-jet' aircraft and helicopters, and in particular, describes research undertaken in support of the development of a system for reducing the noise level at the operators' ear by acoustic cancellation within the ear defender, known as Active Noise Reduction or ANR. The internal noise spectra of today's high performance `fast-jet' aircraft and military helicopters is described, and the complex interaction of acoustic noise transmission, speech, and microphone noise pick-up, which produces the t
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24

Meija, J., G. Keidser, Harvey Dillon, Cong-Van Nguyen, and Earl E. Johnson. "The Effect of Linked Bilateral Noise Reduction Processing on Speech in Noise Performance." Digital Commons @ East Tennessee State University, 2011. https://dc.etsu.edu/etsu-works/1962.

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25

Lee, Jae Seung. "CW and pulsed TWTA phase noise reduction techniques /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.

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26

Backenius, Erik. "Reduction of Substrate Noise in Mixed-Signal Circuits." Doctoral thesis, Linköping : Department of Electrical Engineering, Linköping University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8813.

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27

Cassidy, M. "Noise Reduction of an Enclosed Diesel Generator Set." Thesis, Queen's University Belfast, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527667.

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28

Bunnjaweht, Sawat. "Phase noise reduction techniques for RF signal generator." Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/962/.

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29

Smeatham, David. "The performance of active noise reduction hearing protectors." Thesis, University of Salford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299120.

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30

Dwyer, Sheila E. (Sheila Elizabeth). "Quantum noise reduction using squeezed states in LIGO." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79427.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2013.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Title as it appears in MIT Commencement Exercises program, June 2013: Sensitivity improvement of a LIGO gravitational Wayne detector through squeezed state injection. Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 217-223).<br>Direct detection of gravitational waves will require earth based detectors to measure st
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31

Wettergren, Carl, and Linda Zetterström. "Noise reduction of pedestrian trucks for street unloading." Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176267.

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This report is the result of a Master’s Degree Thesis done at the Royal Institute of Technology, KTH, during October 2014 to April 2015. The project was commissioned by Lidl in collaboration with Stockholms Stad and Integrated Transport Research Labs at KTH, and is a part of the Off-peak project. The Aim of the project was to help Lidl perform quieter street unloadings during off-peak hours. The unloading, today, is done with electrical pedestrian trucks and roll containers. Information was gathered about the current equipment and the current method of unloading was studied through observation
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Wang, Yen-Chun, and 王彥鈞. "Hierarchical Noise Reduction." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/59351483167220885106.

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碩士<br>國立臺灣大學<br>資訊工程學研究所<br>96<br>In this thesis, we introduce a hierarchical noise reduction algorithm which can reduce the noise and preserve the details of the images. This hierarchical method converts an image into a set of four downscaled images which contain information of different frequency in original image. Hence we can process the image in different frequency layers without transferring to frequency domain. Afterwards, we find edge pixels in each sub-image and apply different smoothing methods to edge pixels and non-edge pixels. After handling all four layers of original image, f
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Wang, Yen-Chun. "Hierarchical Noise Reduction." 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2407200809271000.

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34

Ho, Ting-Fai, and 何庭輝. "Noise Estimation and Reduction." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/3896zs.

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碩士<br>國立臺北藝術大學<br>科技藝術研究所碩士班<br>94<br>Due to the population of digital image and the broadening usage of digital image data, like interactive installation art, performance art, etc. In order to fulfill the requirements, improving the quality of digital images is very important. In this thesis, we apply a fast monochrome image noise reduction method to color images. We improve the method by adjusting parameters due to different properties of different color space layers. This thesis propose a fast and proper method for color image noise reduction, which is efficient removing Gaussian noise with
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35

Chou, Yu-Te, and 周育德. "Video Signal Noise Reduction." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/17707249836948648249.

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碩士<br>國立雲林科技大學<br>電機工程技術研究所<br>88<br>With the science and technology are more and more progressional, the video plays an important role in human’s daily life. However, how to promote the video quality will become the valued discussion in the modern society. The purpose of this research is mainly aimed at real-time noise reduction system with video signal, based on the noise reduction algorithm and a FPGA chip that was possessed of superior characters, like high-speed operation and reconfiguration, etc. We also will use the hardware description language to plan the exceptional VLSI
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Wells, Jered R. "Correlated Polarity Noise Reduction: Development, Analysis, and Application of a Novel Noise Reduction Paradigm." Diss., 2013. http://hdl.handle.net/10161/8246.

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<p>Image noise is a pervasive problem in medical imaging. It is a property endemic to all imaging modalities and one especially familiar in those modalities that employ ionizing radiation. Statistical uncertainty is a major limiting factor in the reduction of ionizing radiation dose; patient exposure must be minimized but high image quality must also be achieved to retain the clinical utility of medical images. One way to achieve the goal of radiation dose reduction is through the use of image post processing with noise reduction algorithms. By acquiring images at lower than normal exposure fo
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37

Li, Xiaoli. "Noise reduction for video signals." Thesis, 2002. http://hdl.handle.net/2429/13880.

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Noise reduction is an important aspect of video processing. This thesis proposes a motion adaptive temporal-spatial noise reduction system. The three-step motion detection algorithm is the key for the system. First the pixel-to-pixel difference between two frames are compared to a threshold. This step gives a preliminary motion detection result for each pixel in the target frame. The preliminary motion detection results then go through the impulse pattern recognition module, where some false detections are corrected. The last step of the motion detection method is the spatial motion det
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38

Gebrekidan, Medhanie Tesfay, Christian Knipfer, and Andreas Bräuer. "Vector casting for noise reduction." 2020. https://tubaf.qucosa.de/id/qucosa%3A71502.

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We report a new method for the reduction of noise from spectra. This method is based on casting vectors from one data point to the following data points of the noisy spectrum. The noise‐reduced spectrum is computed from the casted vectors within a margin that is identified by an envelope‐finder algorithm. We compared here the presented method with the Savitzky–Golay and the wavelet transform approaches for noise reduction using simulated Raman spectra of various signal‐to‐noise ratios between 1 and 25 dB and experimentally acquired Raman spectra. The method presented here performs well compare
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39

Chen, Chun-Ming, and 陳俊銘. "Hearing aid noise reduction research." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/xqj54e.

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碩士<br>國立澎湖科技大學<br>電機工程系電資碩士班<br>106<br>Hearing　impairment severely affects people's communication skills and interpersonal relationships, and it also causes a decline in the quality of life. Hearing aids are the most commonly used devices to improve hearing. However, they are widely available and expensive, and there are some differences in functional performance.The difference in hearing aid quality is judged by its noise status.The main purpose of this paper is how to reduce noise and improve sound quality.
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40

Chang, Sheng-Yu, and 昌聖喻. "Common Noise Reduction Filter For Active Noise Cancellation Circuit." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/42421308968305601577.

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碩士<br>華梵大學<br>機電工程研究所<br>92<br>In this thesis, a common noise reduction filter topology is used in the feedback control technique to design an active noise cancellation (ANC) circuit for headphone. This new topology has the advantage of reducing the manufacturing cost and improving the air pressure imbalance problem of ANC headphone. Two types of common noise reduction filters, there are 4-amplifiers and 2-amplifiers circuits respectively, are designed in this thesis. From circuit simulation, it found that the center frequency and bandwidth of the 4-amplifiers filter can be tuned easily. Howev
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Hung, Sheng-Mao, and 洪勝茂. "Using Active Noise Control Technology in Indoor Noise Reduction." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/03569358478525540523.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>90<br>The traditional approaches to attenuate the undesired noise usually use the sound-absorbing material. However, the passive techniques of noise control application in low-frequency noise canceling may be ineffective when they are relatively costly. In order to overcome these problems, the active noise control system uses the adaptive filter to generate an anti-noise to cancel the primary noise, the anti-noise has equal amplitude and opposite phase with primary noise. If we need large quiet zone in the three-dimensional enclosure, and use the active noise contro
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Luo, Wei-lun, and 羅偉倫. "An adaptive noise reduction system with automatic wind noise detection." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/47500754507193473708.

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碩士<br>國立中央大學<br>電機工程學系<br>104<br>As we have known in our daily life, a great noise on the microphone would be produced and signal-to-noise ratio (SNR) of the perceived speech and its quality would be lowered when wind passes through the microphone. The purpose of this study was to develop an adaptive wind noise reduction system. Our system has two parts: firstly we applied the decision tree machine learning algorithm to detect existence of wind noise with the mel frequency cepstrum coefficients (MFCC) used as input features, and parameters of adaptive filter would be changed to reduce the win
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Li, Ming-Hua, and 李明樺. "On Active Noise Control systems with Anti-Noise interference reduction." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/70070974633446314834.

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碩士<br>雲林科技大學<br>通訊工程研究所碩士班<br>98<br>This thesis is focused on the investigation of the acoustic feedback problem that is aroused when an active noise control (ANC) system is trying to eliminate noise. The Filter-X LMS (FXLMS) structure proposed by M.T. Akhtar is modified in such a way that the step size can be adjusted to an optimal value. The improved algorithm, which is named the modified variable step-size FXLMS (MVS FXLMS), has been demonstrated to achieve faster convergence than FXLMS. Moreover, we have found that, even under lower levels of filter design, MVS FXLMS still exhibits some im
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Deonarine, Justin. "Noise reduction limits the McGurk Effect." Thesis, 2011. http://hdl.handle.net/10012/6046.

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In the McGurk Effect (McGurk & MacDonald, 1976), a visual depiction of a speaker silently mouthing the syllable [ga]/[ka] is presented concurrently with the auditory input [ba]/[pa], resulting in “fused” [da]/[ta] being heard. Deonarine (2010) found that increasing the intensity (volume) of the auditory input changes the perception of the auditory input from [ga] (at quiet volume levels) to [da], and then to [ba] (at loud volume levels). The present experiments show that reducing both ambient noise (additional frequencies in the environment) and stimulus noise (excess frequencies in the sound
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Liu, Chi-Wei, and 劉志偉. "A Crosstalk-Induced Noise Reduction Method." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/34421914642477752475.

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碩士<br>國立中興大學<br>資訊科學與工程學系所<br>99<br>In the development of manufacture technology, the chip spacing between adjacent wires are also more closer, resulting in coupling between the wires caused by the crosstalk noise interference tends to be severe. The interference of noise often effect signal integrity, it may cause the chip does not have the correct signal, and thus unexpected error occurred. In this paper, we propose an enhanced driver (ED) that having self-tuning ability, and mounted in the interfered wire. The use of small areas of component design, it can save chip area, and can effectivel
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46

"A receiver-compatible noise reduction system." Research Laboratory of Electronics, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/4199.

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Matthew M. Bace.<br>Also issued as Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.<br>Includes bibliographical references (p. 111-113).<br>Supported in part by the National Science Foundation. MIP 87-14969 Supported in part by the Maryland Procurement Office. MDA 904-89-C-3009
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Yen-Lan, Huang. "Noise Reduction Using Enhanced Bilateral Filter." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2106200613590300.

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48

"Video motion estimation and noise reduction." 2012. http://library.cuhk.edu.hk/record=b5549225.

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隨著數碼相機、攝影手機以及監控攝像機的快速普及，每天無數的視頻錄像被創造出來。運動估計是視頻處理中的一種基本問題，這個問題通常被稱為光流估計。現有光流估計算法無法處理發生較大尺度變化的視頻。但尺度變化在視頻和照片中非常普遍，所以尺度不變性的光流估計算法對於其他視頻處理操作諸如圖像去噪算法有很大幫助。所以我們提出新的方法來解決這個問題，以建立兩幀圖像不同尺度像素之間的稠密匹配。我們提出一個新的框架，引入像素級精度的尺度參數，然後提出一種有效的數值計算機制，迭代地優化離散尺度參數和連續光流參數。這個機制顯著地拓展了光流估計在包含各種類型運動的自然場景的實用性。<br>各種攝像設備獲得的視頻都不同程度地遭到噪聲的破壞。雖然已經提出許多視頻去噪算法，但在實際應用中仍然存在許多問題。所以，我們設計一種複雜度很低而且有效的實時視頻去噪算法。我們在視頻去噪的過程中引入高品質的光流估計來校準圖像序列。我們還設計了一種加權平均算法來從之前校準的原始視頻幀中恢復出沒有噪聲的圖像。實驗結果表明相比于其他算法，我們的算法能恢復出更多的細節。更重要的是，我們的算法保證視頻的時域連貫性，對視頻質量來說非常重要。<br>最後，我們還研究了光照不足的環境下拍攝的視頻和圖像中常見的有色噪聲現象。這種噪聲沒有辦法被現有算法有效地去除，因為它們通常假設噪聲是一個高斯或泊松分佈。根據我們對亮度噪聲和色度噪聲的觀察和分析，
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49

李昱辰. "Traffic Noise Reduction at FengAn Areas." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/rfgr49.

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50

Chang-ShengLiou and 劉長陞. "Noise reduction on dynamic system response." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/8db7k7.

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碩士<br>國立成功大學<br>航空太空工程學系<br>104<br>This paper proposes a numerical technique to design data filter. The proposed filter is developed for the reduction of additive and data noise contained in the discrete output of implicit continuous dynamics that is modeled by a ration function. However, adding controller will emerge bad effect for any system. So, the merits of this technique include an orders of magnitude reduction in the residual noise level and a negligible induced error on the filtered signal. Reduction in data noise is achieved by smoothing the data sequence. First, we simulate a set of dat
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