Sökning: "Perceptual Features"

Visar resultat 36 - 40 av 45 avhandlingar innehållade orden Perceptual Features.

1. 36. Sparse Modeling of Grouped Line Spectra

   Författare :Ted Kronvall; Statistical Signal Processing Group; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; line spectra; parameter estimation; convex optimization; group-sparsity; block-sparsity; dictionary learning; ADMM; adaptive penalty; total variation; multi-pitch estimation; chroma; audio processing; TDOA; near-field localization; amplitude modulation;

   Sammanfattning : This licentiate thesis focuses on clustered parametric models for estimation of line spectra, when the spectral content of a signal source is assumed to exhibit some form of grouping. Different from previous parametric approaches, which generally require explicit knowledge of the model orders, this thesis exploits sparse modeling, where the orders are implicitly chosen. LÄS MER

3. 37. Study and implementation of stereo vision systems for robotic applications

   Författare :Lazaros Nalpantidis; Antonios Gasteratos; Greece Democritus University of Thrace Production and Management Engineering Dept.; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Stereo vision has been chosen by natural selection as the most common way to estimate the depth of objects. A pair of two-dimensional images is enough in order to retrieve the third dimension of the scene under observation. The importance of this method is great, apart from the living creatures, for sophisticated machine systems, as well. LÄS MER

4. 38. On Enhancement and Quality Assessment of Audio and Video in Communication Systems

   Författare :Andreas Rossholm; Blekinge Tekniska Högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; QoE; video quality assessment; video quality metric; multi-linear regression; artificial neural network; support vector machine; quality predictor; machine learning; temporal scaling; spatial scaling; video compression; deblocking filter; noise cancelling; synchronization; audio delay; video delay; GSM interference signal; noise cancellation; notch filtering;

   Sammanfattning : The use of audio and video communication has increased exponentially over the last decade and has gone from speech over GSM to HD resolution video conference between continents on mobile devices. As the use becomes more widespread the interest in delivering high quality media increases even on devices with limited resources. LÄS MER

5. 39. Vision-based Perception For Autonomous Robotic Manipulation

   Författare :Dinh-Cuong Hoang; Todor Stoyanov; Achim Lilienthal; Per-Erik Forssén; Örebro universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : In order to safely and effectively operate in real-world unstructured environments where a priori knowledge of the surroundings is not available, robots must have adequate perceptual capabilities. This thesis is concerned with several important aspects of vision-based perception for autonomous robotic manipulation. LÄS MER

7. 40. Memory for Problem Solving: Comparative Studies in Attention, Working and Long-term Memory

   Författare :Katarzyna Bobrowicz; LUCS grupp för kognitiv zoologi; []
   Nyckelord :HUMANIORA; HUMANITIES; memory; flexibility; comparative cognition; transfer; problem solving; attention;

   Sammanfattning : Living in a complex and dynamically changing environment requires accurate and timely behavioural responses that allow for adapting to such changes. Well-developed perceptual systems provide a continuous flow of abundant and up-to-date information on the changes in the environment, and, thereby, allow for tailoring behavioural responses accordingly. LÄS MER