Dissertations / Theses on the topic 'Dynamic encoding'
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Xie, Fujun. "Improving non-constant luminance color encoding efficiency for high dynamic range video applications." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62132.
Full textApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Al, Zadjali Hanaa. "Compressing labels of dynamic XML data using Base-9 scheme and Fibonacci encoding." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18571/.
Full textKim, Dan. "Dynamic Encoding Is Neither Necessary Nor Sufficient For Logarithmic Compression In Number Estimation." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437057644.
Full textFröhlich, Jan [Verfasser], and Daniel [Akademischer Betreuer] Weiskopf. "Encoding high dynamic range and wide color gamut imagery / Jan Fröhlich ; Betreuer: Daniel Weiskopf." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2017. http://d-nb.info/1153769905/34.
Full textQiu, Peiwen. "Variability in the Pinna Motions of Hipposiderid Bats, Hipposideros Pratti." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/96483.
Full textMaster of Science
Sensors have been developed for a long time, and they can be used to detect the environments and then deliver the required sensing information. There are many different types of sensors, such as vision-based sensors (infrared camera and laser scanner) and sound-based sensors (sonar and radar). Ultrasonic transducers are one of the sound-based sensors, and they are more stable and reliable in environments where smoke or steam is present. Similar to human-made ultrasonic transducers, bats have developed highly capable biosonar systems that consist of one ultrasonic emitter (nose or mouth) and two ultrasonic receivers (ears), and these biosonar systems enable them to fly and hunt in cluttered environments. Some bats, e.g. rhinolophid and hipposiderid bats, have dynamic noseleaves (elaborate baffle shapes surrounding the nostrils) and pinna (outer ear), and these could enhance the sensing abilities of bats. Hence, the purpose of this thesis has been to investigate this variability to improve the human-made sensors by focusing on the dynamic pinna of the bats. It has been shown that bats have two distinct categories of pinna motions: rigid motions which change only the orientation of the pinna, and non-rigid motions which change also the shape of the pinna. However, the variability within the rigid and non-rigid pinna motions has received little attention. Therefore, the present work has investigated the variability in the rigid pinna motions and in the non-rigid pinna motions. Landmark points were placed on the pinna of certain bats and the pinna motions were tracked by high-speed video cameras. The rigid pinna motions exhibit a large continuous variation in where the pinna is orientated during rotation. Distributions of clusters of the landmarks on the pinna have shown that the non-rigid pinna motions fall into at least two subgroups. The acoustic impacts of the rigid pinna motions have been studied by a biomimetic pinna which reproduced the observed range of the rigid pinna motions. Ultrasonic signals mimicking the bats were emitted to be received by the biomimetic pinna. Based on these signals, it has been shown that different rotation axes and even small changes can provide over 50% new sensory information. These findings give engineers a potential way to improve the human-made sensors.
Chen, Yingwen. "XQuery Query Processing in Relational Systems." Thesis, University of Waterloo, 2004. http://hdl.handle.net/10012/1201.
Full textCreutzig, Felix. "Sufficient encoding of dynamical systems." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2008. http://dx.doi.org/10.18452/15817.
Full textThis thesis consists of two parts. In the first part, I investigate the coding of communication signal in a bursting interneuron in the auditory system of the grasshopper Chorthippus biguttulus. The intra-burst spike count codes one temporal feature of the communication signal - pause duration. I show that this code can be understood by a model of parallel fast excitation and slow inhibition. Furthermore, temporal integration of the spike train of this bursting interneuron results in a desirable time-scale invariant read-out of the communication signal. This mechanism can be integrated into a more comprehensive model that can explain behavioural response of grasshoppers. In the second part of this thesis, I combine concepts from information theory and linear system theory to operationalize the notion of ''predictive information''. In the simple case of predicting the next time-step of a signal in an information-theoretic optimal sense, I obtain a description by eigenvectors that are identical to another established algorith, the so-called ''Slow Feature Analysis''. In the general case I optimize a dynamical system such that the predictive information in the input past about the output future is optimalle compressed into the state space. Thereby, I obtain an information-theoretically optimal characterization of reduced system, based on the eigenvectors of the conditional covariance matrix between input past and output future.
Santos-Pata, Diogo. "The Dynamics of hippocampal encoding: beyond the spatial metaphor." Doctoral thesis, Universitat Pompeu Fabra, 2018. http://hdl.handle.net/10803/587163.
Full textTots els animals del nostre planeta passegen mentre busquen alguna cosa. Ja sigui per trobar menjar, parella o un lloc per viure, la nave- gacio` `es un dels comportaments cognitius més realitzats en la natura. No obstant, la nostra comprensió de com el cervell és capaç de resoldre aquest senzill problema − moure’s d’un punt a un altre − encara és incompleta. La descomposició de la navegació en diferents components cognitius revela la complexitat d’aquest comportament. Per assolir un objectiu, hom ha de primer conèixer la seva posició, llavors estimar la posició destí, seguidament identificar una ruta o camí fins a aquesta i, finalment, orquestrar un conjunt d’accions motores que portin fins a la posició desitjada. L’àmplia recerca de l’hipocamp en mamífers ha revelat el seu paper fonamental en la navegació espacial, la memòria i l’aprenentatge. Tot i això, els mecanismes de codificació de la memòria espacial, la representació episódica i els seus homólegs encara no s’han pogut entendre completament. Tanmateix, encara no sabem si els mecanismes involucrats en la representació espacial també escalen des d’un domini purament espacial a la representació de conceptes, com ara les necessitats cognitives d’una tasca. En aquesta tesi presentem un conjunt d’estudis centrats en la representació espacial i cognitiva en el cervell d’insectes i mamífers. Mostrem que el problema de la representació espacial requereix de solucions amb múltiples nivells treballant simultàniament: des dels mecanismes neuronals biofísics fins als aspectes conductuals de la navegació. Per últim, a partir d’estudis fisiológics del lobul temporal mitjà de l’ésser humà, proposem que els mecanismes involucrats en la representació espacial també s’extenen a representacions cognitives d’alt nivell, suggerint que l’hipocamp s’encarrega de la informació independentment de la seva dimensió.
Yarger, Alexandra Mead. "Inertial encoding mechanisms and flight dynamics of dipteran insects." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1585688085360805.
Full textBorresen, Jon Carl. "Dynamical encoding in systems of globally coupled oscillators." Thesis, University of Exeter, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421576.
Full textElijah, Daniel. "Neural encoding by bursts of spikes." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/neural-encoding-by-bursts-of-spikes(56f4cf97-3887-4e89-bc0d-8db183ce9ce1).html.
Full textPoiseau, Eric. "Magnetic resonance imaging of flow using phase velocity encoding : an in vitro study." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/18365.
Full textMailly, Jean-Guy. "Dynamics of argumentation frameworks." Thesis, Artois, 2015. http://www.theses.fr/2015ARTO0402/document.
Full textThis thesis tackles the problem of integrating a new piece of information in an abstract argumentation framework. Such a framework is a directed graph such that its nodes represent the arguments, and the directed edges represent the attacks between arguments. There are different ways to decide which arguments are accepted by the agent who uses such a framework to represent her beliefs.An agent may be confronted with a piece of information such that "this argument should be accepted", which is in contradiction with her current beliefs, represented by her argumentation framework.In this thesis, we have studied several approaches to incorporate a piece of information in an argumentation framework.Our first contribution is an adaptation of the AGM framework for belief revision, which has been developed for characterizing the incorporation of a new piece of information when the agent's beliefs are represented in a logical setting. We have adapted the rationality postulates from the AGM framework to characterize the revision operators suited to argumentation frameworks, and we have identified several ways to generate the argumentation frameworks resulting from the revision.We have also shown how to use AGM revision as a tool for revising argumentation frameworks. Our approach uses a logical encoding of the argumentation framework to take advantage of the classical revision operators, for deriving the expected result.At last, we have studied the problem of enforcing a set of arguments (how to change an argumentation framework so that a given set of arguments becomes an extension). We have developed a new family of operators which guarantee the success of the enforcement process, contrary to the existing approaches, and we have shown that a translation of our approaches into satisfaction and optimization problems makes possible to develop efficient tools for computing the result of the enforcement
Afzal, Muhammad Furqan. "Robust Encoding of Aperiodic Spatiotemporal Activity Patterns in Recurrent Neural Networks." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1458900169.
Full textHodgson, Thomas. "Techniques to protext exciiton-based quantum computation : dynamical decoupling and redundant encoding." Thesis, University of York, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503307.
Full textMarcoux, Curtis. "Encoding of Sensory Signals Through Balanced Ionotropic Receptor Dynamics and Voltage Dependent Membrane Noise." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34440.
Full textGupta, Anupam Kumar. "Numerical analysis of bat noseleaf dynamics and its impact on the encoding of sensory information." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/74951.
Full textPh. D.
Berton, Chloé. "Sécurité des données stockées sur molécules d’ADN." Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2024. http://www.theses.fr/2024IMTA0431.
Full textThe volume of digital data produced worldwide every year is increasing exponentially, and current storage solutions are reaching their limits. In this context, data storage on DNA molecules holds great promise. Storing up to 10¹⁸ bytes per gram of DNA for almost no energy consumption, it has a lifespan 100 times longer than hard disks. As this storage technology is still under development, the opportunity presents itself to natively integrate data security mechanisms. This is the aim of this thesis. Our first contribution is a risk analysis of the entire storage chain, which has enabled us to identify vulnerabilities in digital and biological processes, particularly in terms of confidentiality, integrity, availability and traceability. A second contribution is the identification of elementary biological operators for simple manipulations of DNA. Using these operators, we have developed a DNACipher encryption solution that requires biomolecular decryption (DNADecipher) of the molecules before the data can be read correctly. This third contribution, based on enzymes, required the development of a coding algorithm for digital data into DNA sequences, a contribution called DSWE. This algorithm respects the constraints of biological processes (e.g. homopolymers) and our encryption solution. Our final contribution is an experimental validation of our secure storage chain. This is the first proof of concept showing that it is possible to secure this new storage medium using biomolecular manipulations
Dezhdar, Tara [Verfasser]. "Unmixing sensory channels encoding mechanical and thermal stimuli : A Probabilistic approach to study the spatiotemporal dynamics of nociceptors / Tara Dezhdar." Berlin : Freie Universität Berlin, 2016. http://d-nb.info/1090877943/34.
Full textKillian, Nathaniel J. "Bioelectrical dynamics of the entorhinal cortex." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52148.
Full textSchulze, Aljoscha 1980. "Characterizing the encoding of dynamical olfactory inputs in single olfactory sensory neurons to remote control larval chemotaxis by means of optogenetics." Doctoral thesis, Universitat Pompeu Fabra, 2015. http://hdl.handle.net/10803/482048.
Full textLos animales tienen que hacer frente a un entorno caracterizado por un flujo variable y abundante de información sensorial. ¿Qué rasgos de este flujo de información son capturados por el sistema sensorial? Este trabajo examina como las neuronas olfativas sensoriales de primer orden (NOS) de la larva de Drosophila procesan las señales experimentadas durante comportamientos olfativos incondicionados. Mediante la combinación de una novedosa técnica de grabación extracelular y un sistema de control de microfluidos que permite controlar temporal y espacialmente el suministro de olor, se exploraron los principios computacionales que permiten codificar los estímulos dinámicos de olor en una sola NOS. Para explorar el espacio que codifican las NOS y recrear una respuesta olfatoria naturalista se utilizaron técnicas de optogenética. Los resultados de este estudio sugieren que tanto los cambios de estímulos relativos como su integración temporal son capturados en una sola NOS. Por último, se cuantificó la conducta larval en entornos de olor virtual de bucle cerrado (closed-loop virtual odor environment) y se analizó teniendo en cuenta la influencia de las características dinámicas del estímulo. Del análisis resultó que la actividad neuronal de una única NOS está firmemente correlacionada con características dinámicas, en particular con la derivada de la intensidad del estímulo. Estos hallazgos ponen de manifiesto vinculan la actividad neuronal de una sola neurona sensorial con transiciones del comportamiento. En conjunto, los resultados de este trabajo proporcionan un punto de partida para comprender la toma de decisiones de las larvas durante la quimiotaxis.
Soerensen, Dennis Dam. "Optimization and Analysis of The Total Cavo-Pulmonary Connection." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10444.
Full textWei, Wei Verfasser], Fred [Akademischer Betreuer] Wolf, Reiner [Akademischer Betreuer] Kree, and Tobias [Akademischer Betreuer] [Moser. "Theoretical Studies of the Dynamics of Action Potential Initiation and its Role in Neuronal Encoding / Wei Wei. Gutachter: Fred Wolf ; Reiner Kree ; Tobias Moser. Betreuer: Fred Wolf." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2011. http://d-nb.info/1043612386/34.
Full textBiral, Andrea. "Novel Network Paradigms: Microfluidic and M2M Communications." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3424683.
Full textLa presente tesi si focalizza sullo studio di due importanti paradigmi che si prevede possano caratterizzare i sistemi di comunicazione di prossima generazione: le reti microfluidiche e le comunicazioni Machine to Machine (M2M). Riguardo alle reti microfluidiche, in questo lavoro illustriamo come sia possibile introdurre elementi di switch e meccanismi di routing all’interno di sistemi microfluidici. Definiamo poi alcuni semplici modelli matematici che descrivono il comportamento macroscopico di gocce all’interno di tali reti. Questi ultimi sono quindi sfruttati per implementare un simulatore che è capace di riprodurre il movimento e predire il percorso delle gocce in un generico sistema microfluidico. Dopo averlo validato sperimentalmente, il simulatore è impiegato per progettare una rete microfluidica con topologia a bus. Infine, viene dimostrato come sia possibile realizzare comunicazioni molecolari in questo ambito tramite la formalizzazione e la descrizione di un protocollo che sfrutta la modulazione della lunghezza/interdistanza delle gocce per trasferire informazione. L’attività di ricerca in merito alle comunicazioni M2M, invece, è finalizzata allo studio di due importanti criticità insite nelle Machine-Type Communications (MTCs), ovvero l’efficienza energetica e l’accesso simultaneo di massa (massive access). Per quanto concerne l’efficienza energetica, viene affrontato il problema di trasmettere un payload di una certa lunghezza fissata attraverso un canale wireless affetto da Rayleigh fading con lo scopo di minimizzare il costo totale medio dell’utente finale, dato dalla somma dell’energia di trasmissione e di quella di circuito, per completare l’operazione. Tale scenario ben si applica al contesto di trasmissioni cellulari per applicazioni di tipo IoT nelle future reti 5G, dove l’attenzione è rivolta maggiormente all’efficienza energetica dei dispositivi rispetto al throughput, in quanto le UE hanno tipicamente capacità computazionali ed energetiche esigue e si limitano ad inviare sporadicamente pacchetti molto brevi. Vengono quindi descritte le strategie ottime di trasmissione da adottare in un contesto di accesso coordinato a seconda del livello di dettaglio sulle informazioni di canale e delle potenzialità di trasmettitore/ricevitore, illustrando i corrispondenti limiti teorici. Nell’ultima parte del lavoro vengono studiate le prestazioni asintotiche di schemi di accesso non coordinati quando si utilizzano tecniche di Multi Packet Reception (MPR) e Successive Interference Cancellation (SIC) per la risoluzione delle collisioni al ricevitore. I risultati corrispondenti, in termini di throughput, per uno scenario M2M con massive access sono infine ricavati e discussi.
Kempf, Alexandre. "Nonlinear encoding of sounds in the auditory cortex Temporal asymmetries in auditory coding and perception reflect multi-layered nonlinearities Cortical recruitment determines learning dynamics and strategy Interactions between nonlinear features in the mouse auditory cortex Context-dependent signaling of coincident auditory and visual events in primary visual cortex." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCB085.
Full textPerceptual objects are the elementary units used by the brain to construct an inner world representation of the environment from multiple physical sources, like light or sound waves. While the physical signals are first encoded by receptors in peripheral organs into neuroelectric signals, the emergence of perceptual object require extensive processing in the central nervous system which is not yet fully characterized. Interestingly, recent advances in deep learning shows that implementing series of nonlinear and linear operations is a very efficient way to create models that categorize visual and auditory perceptual objects similarly to humans. In contrast, most of the current knowledge about the auditory system concentrates on linear transformations. In order to establish a clear example of the contribution of auditory system nonlinearities to perception, we studied the encoding of sounds with an increasing intensity (up ramps) and a decreasing intensity (down ramps) in the mouse auditory cortex. Two behavioral tasks showed evidence that these two sounds are perceived with unequal salience despite carrying the same physical energy and spectral content, a phenomenon incompatible with linear processing. Recording the activity of large cortical populations for up- and down-ramping sounds, we found that cortex encodes them into distinct sets of non-linear features, and that asymmetric feature selection explained the perceptual asymmetry. To complement these results, we also showed that, in reinforcement learning models, the amount of neural activity triggered by a stimulus (e.g. a sound) impacts learning speed and strategy. Interestingly very similar effects were observed in sound discrimination behavior and could be explain by the amount of cortical activity triggered by the discriminated sounds. This altogether establishes that auditory system nonlinearities have an impact on perception and behavior. To more extensively identify the nonlinearities that influence sounds encoding, we then recorded the activity of around 60,000 neurons sampling the entire horizontal extent of auditory cortex. Beyond the fine scale tonotopic organization uncovered with this dataset, we identified and quantified 7 nonlinearities. We found interestingly that different nonlinearities can interact with each other in a non-trivial manner. The knowledge of these interactions carry good promises to refine auditory processing model. Finally, we wondered if the nonlinear processes are also important for multisensory integration. We measured how visual inputs and sounds combine in the visual and auditory cortex using calcium imaging in mice. We found no modulation of supragranular auditory cortex in response to visual stimuli, as observed in previous others studies. We observed that auditory cortex inputs to visual cortex affect visual responses concomitant to a sound. Interestingly, we found that auditory cortex projections to visual cortex preferentially channel activity from neurons encoding a particular non-linear feature: the loud onset of sudden sounds. As a result, visual cortex activity for an image combined with a loud sound is higher than for the image alone or combine with a quiet sound. Moreover, this boosting effect is highly nonlinear. This result suggests that loud sound onsets are behaviorally relevant in the visual system, possibly to indicate the presence of a new perceptual objects in the visual field, which could represent potential threats. As a conclusion, our results show that nonlinearities are ubiquitous in sound processing by the brain and also play a role in the integration of auditory information with visual information. In addition, it is not only crucial to account for these nonlinearities to understand how perceptual representations are formed but also to predict how these representations impact behavior
Tang, Chi-Sun. "High Dynamic Range Video Encoding Algorithm Design and Implementation." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2807200711320700.
Full textTang, Chi-Sun, and 鄧智生. "High Dynamic Range Video Encoding Algorithm Design and Implementation." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/41791370295026800624.
Full text臺灣大學
電機工程學研究所
95
Real world luminance ranges from a few cd/m2 at dark night to over thousands of billions cd/m2 under direct sunlight. For typical sceneries, the dynamic range which is defined as the maximum to minimum luminance ratio ranges from 3 to 10 orders of magnitudes. High Dynamic Range Imaging and Video can bring about much more realistic image to the audience. In other fields such as medical imaging (CT, MRI) or space exploration imaging, any details in the original scene have too high a price to discard and High Dynamic Range Video will be a suitable tool that can assist the development in these fields. In scene-referred capturing, we try to capture the whole range of luminance in the real scene with every possible effort to preserve visual details. Preserving every detail causes a lot of bandwidth, storage spaces; and most importantly, we will need a new video/image encoding and compressing method and system. What is lacking on the path to bring High Dynamic Range video to users is High Dynamic Range encoding systems.In this research, we have conducted analysis on the problem about the encoding and compression difficulties in High Dynamic Range Video. We have proposed a backward compatible High Dynamic Range video encoding algorithm and the respective hardware implementation. The proposed algorithm takes into account the high correlation between the normal and High Dynamic Range Image.Apart from the goal of achieving high compression ratio, other aspects such as proportionality of dynamic range versus bit-rate, flexibility for users to use different TMO, dynamic range scalability and dynamic range adjustments capabilities are considered and implemented in our algorithm. In conclusion, we have proposed a novel algorithm in HDR video encoding which fulfills several scalability and flexibility requirements. In the algorithm we have proposed a new HDR-LDR prediction method, a LALEMO method and a flexible automatic multi-level prediction model. Hardware implementation proves that the algorithm is realizable. We believe that with all the above virtues and benefits, the algorithm and methods proposed could become one of the important factors in bringing HDR video to real life enjoyments.
COLANGELI, STEFANO. "Premotor cortex encoding of dynamic hand force and motor output observation underlying hand-object interaction." Doctoral thesis, 2019. http://hdl.handle.net/11573/1249024.
Full textLi-Wei, Chen. "Dynamic Bus Encoding based on Realistic RLC Table with Low Power Coonsideration." 2004. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2506200417242800.
Full textStemmann, Heiko [Verfasser]. "Encoding and attentive modulation of dynamic motion stimuli / vorgelegt von Heiko Stemmann." 2008. http://d-nb.info/992318947/34.
Full textChen, Li-Wei, and 陳立偉. "Dynamic Bus Encoding based on Realistic RLC Table with Low Power Coonsideration." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/21106771045863053734.
Full text國立臺灣大學
資訊工程學研究所
92
In the years to come, interconnect will be a challenge to surmount for deep sub-micron (DSM) technologies. The use of DSM technology increases the capacitive and inductive coupling which leads to severe crosstalk noise, more power dissipation and malfunction of the chip between neighboring wires. We propose a method to reduce crosstalk noise on buses based on dynamic coding scheme. The proposed method deals with capacitive and inductive effects at the same time by using the realistic RLC table and the segmented bus-invert method. The experimental results show that our approach reduces bus power consumption up to 7%.
謝丹青. "A Perception-based High Dynamic Range Image Encoding with Discrete Wavelet Transform." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/21728305057530663939.
Full text國立清華大學
資訊工程學系
95
A high dynamic range (HDR) image contains a vast amount of luminance and color information at the same time. In order to improve the efficiency in transmission and storage, a proper encoding method is necessary. We propose a perception-based HDR image encoding scheme using the Huffman code to achieve a quantization error curve that is below Ferwerda’s contrast versus intensity (c.v.i). With the discrete wavelet transform (DWT), we propose a sub-band histogram-based HDR image encoding scheme. By assigning different number of bits to the low band and the high band, we show that only an average of 5 bits is required to encode the luminance data under human perceptive range. This method has more than two times quantization efficiency compared with the previous result of encoding luminance data using 10~11 bits [1]. Besides, we verify the correctness of the tone mapping results from the low resolution bit stream because the receiver may only obtain the LL band data in the SVC system. We also represent a simple tone mapping way to ease the influence of DWT-tone mapping.
Chen, Ming-chuan, and 陳明權. "Exploiting Dynamic Encoding and Multiple Pages for Record Boundary Detection and Data Extraction." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/40047769761321237804.
Full text國立中央大學
資訊工程學系
102
Record boundary detection plays an important role in wrapper induction and the quality of record boundary detection will affect the precision of alignment and extraction directly. Previous approaches usually focus on calculating similarity between blocksor measure tree similarity in a single page. In this paper, we analyze multiple pages that are generated by the same website. By exploring common parts and different parts in pages, we can overcome the weakness in single-page approaches. Because the computation load will increase when we deal with more pages, the proposed approach only focus on leaf nodes in DOM tree, which are about 30 percent of all nodes. We propose dynamic encoding, which can abstract leaf nodes and emphasize the regularity of every data records. With the dynamic encoding, we reduce the numberof the repeated pattern discovered. Finally, we propose the idea of landmark, which is located in the data record, and detecting the record boundary by segmenting the DOM tree. In the experiment, we evaluate the efficiencyin our approach and compare the effectivenesswith other systems.
Yuliana, Oviliani Yenty, and 陳燕琴. "Annotation-Free Induction of Full Schema from Template Web Pages with Dynamic Encoding." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/e4zscf.
Full text國立中央大學
資訊工程學系
107
Automatic data extraction from template pages is an essential task for data integration and analysis. Most researches focus on data extraction from list pages. The problem of data alignment for singleton pages, which contain detail information of a single item is less addressed and is more challenging. In the rst work, we propose a novel Divide-and-Conquer Alignment algorithm (DCA) that works on leaf nodes from the DOM trees of singleton pages. The idea is to detect mandatory templates via the longest increasing sub-sequence from the landmark quivalence class leaf nodes and recursively apply the same procedure to each segment divided by mandatory templates. DCA able aligns each segment efficiently and handles multi-order attribute-value pairs eeffectively with a two-pass procedure. The results on selected items, DCA outperforms TEX and WEIR 2% and 12% respectively. The improvement is more obvious in terms of full schema evaluation, with 0.95 (DCA) versus 0.63 (TEX) F1 measure, on 26 websites from TEX and ExAlg. In the second work, we propose an unsupervised full schema web data extraction via Divide-and-Conquer Alignment with Dynamic Encoding (DCADE) from either multiple list pages or singleton pages with the same template. We dene the Content Equivalence Class and Typeset Equivalence Class based on leaf node content. We then combine HTML attributes (id and class) in the paths for various levels of encoding, so that the proposed algorithm can align leaf nodes by exploring patterns at various levels from specic to general. We conducted experiments on 49 real-world websites used in TEX and ExAlg. The proposed DCADE achieved a 0.962 F1 measure for non-recordset data extraction (FD), and a 0.936 F1 measure for recordset data extraction (FS), which outperformed other page-level web data extraction methods, i.e., DCA (FD=0.660), TEX (FD=0.454 and FS=0.549), RoadRunner (FD=0.396 and FS=0.330), and UWIDE (FD=0.260 and FS=0.081).
Zhang, Chenfei. "Information Processing Analysis in Neural Networks." Doctoral thesis, 2018. http://hdl.handle.net/21.11130/00-1735-0000-0003-C11D-3.
Full textÖzçete, Özge Demet. "Sound encoding at the first auditory synapse." Doctoral thesis, 2019. http://hdl.handle.net/21.11130/00-1735-0000-0005-1462-6.
Full textTaghizadeh, Bahareh. "Reference frames for planning reach movement in the parietal and premotor cortices." Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-0028-86C4-2.
Full textWei, Wei. "Theoretical Studies of the Dynamics of Action Potential Initiation and its Role in Neuronal Encoding." Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B5CA-7.
Full textCreutzig, Felix [Verfasser]. "Sufficient encoding of dynamical systems : from the grasshopper auditory system to general principles / von Felix Creutzig." 2008. http://d-nb.info/990996921/34.
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