Sökning: "perceptual grouping"

Hittade 5 avhandlingar innehållade orden perceptual grouping.

1. 1. Discrete Scale-Space Theory and the Scale-Space Primal Sketch

   Författare :Tony Lindeberg; Jan-Olof Eklundh; Jan. J Koenderink; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Computer vision; low-level processing; scale-space; diffusion; Gaussian filtering; discrete smoothing; primal sketch; segmentation; descriptive elements; scale detection; image structure; focus-of-attention; tuning low-level processing; blob detection; edge detection; edge focusing; histogram analysis; junction classification; perceptual grouping; texture analysis; critical points; classification of blob events; bifurcations; drift velocity; density of local extrema; multi-scale representation; digital signal processing; Computer Science; Datalogi;

   Sammanfattning : This thesis, within the subfield of computer science known as computer vision, deals with the use of scale-space analysis in early low-level processing of visual information. The main contributions comprise the following five subjects:The formulation of a scale-space theory for discrete signals. LÄS MER

3. 2. Prosodic Phrasing in Spontaneous Swedish

   Författare :Petra Hansson; Allmän språkvetenskap; []
   Nyckelord :HUMANIORA; HUMANITIES; intonation.; spontaneous speech; optimality theory; prominence; grouping; phrasing; Southern Swedish; Swedish; speech planning; speech production; speech perception; prosody; phonology; phonetics; Fonetik; fonologi;

   Sammanfattning : One of the most important functions of prosody is to divide the flow of speech into chunks. The chunking, or prosodic phrasing, of speech plays an important role in both the production and perception of speech. LÄS MER

4. 3. Psychoacoustics and hallucinating schizophrenics. A psychobiological approach to schizophrenia

   Författare :Olle M Olsson; Lund Psykiatri; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Psychiatry; psychiatry; perception; auditory grouping; psychoacoustics; Schizophrenia; auditory hallucinations; clinical psychology; psychosomatics; Psykiatri; klinisk psykologi; psykosomatik;

   Sammanfattning : Psychoacoustic experiments have been conducted for schizophrenic patients with auditory hallucinations in their case history and for reference subjects. The aim of the thesis has been to assess differences between the two groups of subjects. LÄS MER

5. 4. 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

7. 5. Analyses of voice and glottographic signals in singing and speech

   Författare :Andreas Selamtzis; Sten Ternström; Paavo Alku; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; voice ; singing ; electroglottography ; clustering ; dysphonia ; sample entropy ; ; Tal- och musikkommunikation; Speech and Music Communication;

   Sammanfattning : Recent advances in machine learning and time series analysis techniques have brought new perspectives to a great number of scientific fields. This thesis contributes applications of such techniques to voice analysis, in an attempt to extract information on the vibration of the vocal folds as such, as well as on the radiated acoustic signal. LÄS MER