Rank: 79 based on 771 downloads (last 30 days) and 13 files submitted
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Theodoros Giannakopoulos

E-mail
Company/University
Computational Intelligence Lab @ Demokritos . gr
Lat/Long
37.96795272827148, 23.76673698425293

Personal Profile:

Theodoros Giannakopoulos received his diploma of Informatics and Telecommunications in the University of Athens (2002), M.Sc. of SIPS ("Signal and Image Processing Systems), organised by University of Patras (2004) and his PhD in the field of audio analysis (University of Athens, 2009).

He is currently a research associate in
- Computational Intelligence Laboratory (CIL) of the Institute of Informatics and Telecommunications (National Center for Scientific Research "DEMOKRITOS", Greece)
- the Dpt of Informatics and Telecommunications in the University of Athens .

WEB PAGE: http://www.di.uoa.gr/~tyiannak

Professional Interests:
Signal Processing, Pattern recognition, audio classification, content-based multimedia indexing.

 

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Files Posted by Theodoros View all
Updated   File Tags Downloads
(last 30 days)
Comments Rating
18 Mar 2014 Screenshot Real Time Microphone and Camera data acquisition and audio-video processing This Matlab-code is a demo for real-time audio and image processing. Author: Theodoros Giannakopoulos audio processing, video processing, camera, microphone, zero crossng r, record 99 14
  • 4.58333
4.6 | 13 ratings
18 Mar 2014 Screenshot Some Basic Audio Features Use the provided m-files for computing the features of an audio classification problem Author: Theodoros Giannakopoulos audio processing, video processing, audio feature calcula..., audio classification, audio segmentation 61 7
  • 4.6
4.6 | 5 ratings
18 Mar 2014 Screenshot Silence removal in speech signals A simple method for silence removal in speech streams Author: Theodoros Giannakopoulos signal processing, speech analysis, audio, speech 84 6
  • 5.0
5.0 | 4 ratings
18 Mar 2014 Screenshot Matlab Audio Analysis Library Companion material for the book "Introduction to Audio Analysis, A MATLAB approach" Author: Theodoros Giannakopoulos audio analysis, signal processing, audio classification, audio segmentation, speaker diarization, music information ret... 93 0
  • 4.0
4.0 | 1 rating
12 Sep 2012 Screenshot Image Processing GUI A simple GUI with basic image processing functionalities. Author: Theodoros Giannakopoulos image processing, gui, color filtering, moion filtering 133 6
  • 4.5
4.5 | 2 ratings
Comments and Ratings by Theodoros View all
Updated File Comments Rating
19 Apr 2013 mmread Read virtually any media file in Windows, Linux, or Mac. Author: Micah Richert

Really nice work! Though, I have the following problem. When reading frames from a large video file and the function seems to be rather slow for large frame indeces. E.g
video = mmread('/home/tyiannak/Desktop/05-10-19.avi', [10000]);
runs for several seconds. I suppose this is due to some type of file seeking. Can I avoide this?
Regards,
Theodore

14 Mar 2013 Silence removal in speech signals A simple method for silence removal in speech streams Author: Theodoros Giannakopoulos

Dear Nikolay. First of all thank you for your comments. Some notes on them:
(a) mp3 IO was not supported in older Matlab versions. Furthermore, audioread seems to have some OS compatibility issues, so I stuck with WAV file format only. Personally, I prefer to use some extrernal script for transcoding (e.g. commandline ffmpeg...)
(b) optioned listening seems right to me to: I will change this in the future
(c) GUI is also some fututre plan
(d) It's true that the precision / recall is not 100%: this is due to the very simple audio features adopted. One can rely to more sophisticated features for better results (e.g. mfccs, other spectral features etc).
I'd be glad to see your new results using and expanding this algorithm.
Again, thank you for your comments!
Theodoore

24 Mar 2011 mmread Read virtually any media file in Windows, Linux, or Mac. Author: Micah Richert

I've just downloaded your code and used it for reading mpeg files in Matlab. The fact that is worked without any problems on Ubuntu is really good, so ... thank you!

15 Feb 2011 Image Processing GUI A simple GUI with basic image processing functionalities. Author: Theodoros Giannakopoulos

Hi Sam. Thank you for your question. This is quite simple actually. You only need to add a button and then use the imrotate function (http://www.mathworks.com/help/toolbox/images/ref/imrotate.html). I am uploading an updated version which provides you the ability to rotate an image (rotate angle is selected in the range 0.360 using a slider).

03 Feb 2011 Image retrieval - Query by Example Demo This demo provides a simple query by image example method, based on HSV values. Author: Theodoros Giannakopoulos

Hi MUKUND SARDA, thank you for your interest. There is a quite detailed description of the algorithm above. In general the idea is quite simple: an empirical measure is defined on the thresholded distances of the HSV feature space. Then this similarity measure is sorted for returning the closest images. If you have any particular questions, please feel free to ask.

Comments and Ratings on Theodoros' Files View all
Updated File Comment by Comments Rating
25 Jul 2014 Color Detection Using HSV Color Space (Training and Testing) The provided Matlab functions demonstrate a simple method for training and testing a color detection Author: Theodoros Giannakopoulos pervez, mahum

the code is not running when example.m is executed

18 May 2014 Image Processing GUI A simple GUI with basic image processing functionalities. Author: Theodoros Giannakopoulos Nina

This is awesome!Thank you very much!

14 Mar 2014 Color Detection Using HSV Color Space (Training and Testing) The provided Matlab functions demonstrate a simple method for training and testing a color detection Author: Theodoros Giannakopoulos MML

thanks for the share :)

12 Mar 2014 Matlab Audio Analysis Library Companion material for the book "Introduction to Audio Analysis, A MATLAB approach" Author: Theodoros Giannakopoulos Eugene

14 Jan 2014 Real Time Microphone and Camera data acquisition and audio-video processing This Matlab-code is a demo for real-time audio and image processing. Author: Theodoros Giannakopoulos Kalliatakis, Grigorios

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