Essays about: "gabor transform"

Found 5 essays containing the words gabor transform.

1. 1. Comparative study of table layout analysis : Layout analysis solutions study for Swedish historical hand-written document

   University essay from Blekinge Tekniska Högskola/Institutionen för datalogi och datorsystemteknik

   Author : Xusheng Liang; [2019]
   Keywords : layout analysis; pattern recognition; document digitalization; table layout extraction; transfer learning; machine learning; image processing; Hessian filter; Gabor filter;

   Abstract : Background. Nowadays, information retrieval system become more and more popular, it helps people retrieve information more efficiently and accelerates daily task. READ MORE

3. 2. Time-frequency analysis for responses evoked by nociceptive and non-nociceptive stimuli based on EEG signals

   University essay from Lunds universitet/Avdelningen för Biomedicinsk teknik

   Author : Juan Pablo Lagos Benitez; [2015]
   Keywords : ICA; artifact; pain; nociceptive; EEG; Technology and Engineering;

   Abstract : In the pursuit of a system capable of measuring pain signals in humans we propose a method to differentiate those signals related to pain from those which are not. We performed a time-frequency analysis using the Gabor transform to have complete information about the spectrum and its behaviour through the time to study the main differences over the evoked potentials provoked by both nociceptive and somatosensory (non-nociceptive) stimulation. READ MORE

4. 3. On the Short-Time Fourier Transform and Gabor Frames generated by B-splines

   University essay from Institutionen för datavetenskap, fysik och matematik, DFM

   Author : Henrik Fredriksson; [2012]
   Keywords : short-time Fourier transform; time-frequency analysis; Gabor frames; B-splines;

   Abstract : In this thesis we study the short-time Fourier transform. The short-time Fourier transform of a function f(x) is obtained by restricting our function to a short time segment and take the Fourier transform of this restriction. This method gives information locally of f in both time and frequency simultaneously. READ MORE

5. 4. Audio editing in the time-frequency domain using the Gabor Wavelet Transform

   University essay from Centrum för bildanalys

   Author : Ulf Hammarqvist; [2011]
   Keywords : Wavelet transform; time-frequency analysis; audio engineering; signal processing; audio restoration; audio interpolation; pitch-shift; time-stretch; loglet; compression; down-sampling; visualization; fourier transform; convolution; filter bank; digital filters; noise reduction; re-assignment; gabor transform; scalogram;

   Abstract : Visualization, processing and editing of audio, directly on a time-frequency surface, is the scope of this thesis. More precisely the scalogram produced by a Gabor Wavelet transform is used, which is a powerful alternative to traditional techinques where the wave form is the main visual aid and editting is performed by parametric filters. READ MORE

6. 5. Extraction and Application of Secondary Crease Information in Fingerprint Recognition Systems

   University essay from Institutionen för teknik och naturvetenskap

   Author : Pontus Hymér; [2005]
   Keywords : Datorteknik; biometrics; fingerprint analysis; feature extraction; secondary creases; template aging; Gabor filter; pattern recognition; Hough transform; vector clustering; Datorteknik;

   Abstract : This thesis states that cracks and scars, referred to as Secondary Creases, in fingerprint images can be used as means for aiding and complementing fingerprint recognition, especially in cases where there is not enough clear data to use traditional methods such as minutiae based or correlation techniques. A Gabor filter bank is used to extract areas with linear patterns, where after the Hough Transform is used to identify secondary creases in a r, theta space. READ MORE