Rank: 124 based on 2491 downloads (last 30 days) and 10 files submitted
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Theodoros Giannakopoulos

E-mail
Company/University
Dpt of Informatics and Telecommunications - University of Athens
Lat/Long
37.967953, 23.766737

Personal Profile:

Theodoros Giannakopoulos received his diploma on of Informatics and Telecommunications in the University of Athens (2002) and M.Sc. of SIPS ("Signal and Image Processing Systems), organized by University of Patras (2004).

His is currently a PHD student in Signal and Image Processing Laboratory, Department of Informatics and Telecommunications, University of Athens.

His research interests are from the fields of signal processing, pattern recognition and audio classification.

WEB PAGE: http://www.di.uoa.gr/~tyiannak
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Professional Interests:
Signal Processing, Pattern recognition, audio classification, content-based multimedia indexing.

 

Watch this Author's files

 

Files Posted by Theodoros View all
Updated   File Tags Downloads
(last 30 days)
Comments Rating
24 Feb 2009 Screenshot Generate report of .m files in html table Generates a report of the m-files in a given directory. Results are stored in an html file. Author: Theodoros Giannakopoulos matlab documentation, misc, help 211 2
  • 4.0
4.0 | 1 rating
08 Nov 2008 Screenshot Image retrieval - Query by Example Demo This demo provides a simple query by image example method, based on HSV values. Author: Theodoros Giannakopoulos color, image analysis, image retrieval, query by example 307 11
  • 3.5
3.5 | 6 ratings
20 May 2008 Screenshot Generate Animated GIF Files for Plotting Audio Data This m-file generates a animated GIF file that visualizes audio data. Author: Theodoros Giannakopoulos animated gif, video processing, animation, audio visulization, audio data, audio processing 266 1
  • 5.0
5.0 | 1 rating
23 Apr 2008 Screenshot Audio Filter GUI DEMO This demo provides a simple GUI for basic filtering of audio data. Author: Theodoros Giannakopoulos video processing, sound, filtering, audio, speech, audio processing 235 0
21 Apr 2008 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 zero crossng r, video processing, microphone, camera, audio processing 371 6
  • 4.8
4.8 | 5 ratings
Comments and Ratings by Theodoros View all
Updated File Comments Rating
24 Feb 2009 Image retrieval - Query by Example Demo This demo provides a simple query by image example method, based on HSV values. Author: Theodoros Giannakopoulos

Hi guys, thanx alot for your comments. Sorry for the looong delay, but I hadn't checked the forum for quite a long time. Anyway, I am posting a simple function that computes the color histograms of a whole directory of images. In this way you will be also able to build your training data. You can use this function and then store the returned histograms (along with the filenames) in a mat file.

Matlab code:

function [Hists, files] = getImageHistsDir(DirName)

D = dir(DirName);

count = 0;

for (i=3:length(D))
    if ((strcmpi(D(i).name(end-3:end), '.jpg')==1) | (strcmpi(D(i).name(end-3:end), '.jpeg')==1))
        count = count + 1;
        [Hists{count}] = getImageHists([DirName '\\' D(i).name]);
        files{count} = [DirName '\\' D(i).name];
        fprintf('%.4d File %40s computed...\n',count,files{count})
    end
end

As you can see, you just specify the directory name in which the images are stored. This is actually what Nicola Franzoso has provided, but in a function mode.

23 Nov 2008 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

Comments and Ratings on Theodoros' Files View all
Updated File Comment by Comments Rating
24 Oct 2009 Image retrieval - Query by Example Demo This demo provides a simple query by image example method, based on HSV values. Author: Theodoros Giannakopoulos verma, mansi

image retrieval code is not getting downloaded. its showing an error of invalid archieve. please update it and if possible send a copy to
mansiverma65@gmail.com

thank u!!

05 Oct 2009 Image retrieval - Query by Example Demo This demo provides a simple query by image example method, based on HSV values. Author: Theodoros Giannakopoulos Raksha

25 May 2009 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 Bernd

are you rating your owm files?

20 May 2009 Image retrieval - Query by Example Demo This demo provides a simple query by image example method, based on HSV values. Author: Theodoros Giannakopoulos Ê, ampire

thank you for your code! But I think the code above is not very exact.it's code based on you:
function [Hists,files] = getImageHistsDir(DirName)
D = dir(DirName);
count = 0;
 
for (i=3:length(D))
    if ((strcmpi(D(i).name(end-3:end), '.jpg')==1) | (strcmpi(D(i).name(end-3:end), '.jpeg')==1))
        count = count + 1;
        Hists{count}=getImageHists([DirName '\\' D(i).name]);
        files{count}=[DirName '\\' D(i).name];
        fprintf('%.4d File %40s computed...\n',count,files{count});
    end
end
savefile='mydatabase';
save (savefile, 'files', 'Hists')
Making use of it,you can get imagesdir in your images files.thank you!

22 Apr 2009 Image retrieval - Query by Example Demo This demo provides a simple query by image example method, based on HSV values. Author: Theodoros Giannakopoulos khan, mubashar

i managed to get the images to be computed however i couldnt get the .mat file saved in a way so that when i used the code from the original to run it, it would jus come up with the error about Nfiles. can any 1 help me out with this? thanks

Top Tags Applied by Theodoros
audio processing, video processing, color, animated gif, audio
Files Tagged by Theodoros View all
Updated   File Tags Downloads
(last 30 days)
Comments Rating
24 Feb 2009 Screenshot Generate report of .m files in html table Generates a report of the m-files in a given directory. Results are stored in an html file. Author: Theodoros Giannakopoulos matlab documentation, misc, help 211 2
  • 4.0
4.0 | 1 rating
08 Nov 2008 Screenshot Image retrieval - Query by Example Demo This demo provides a simple query by image example method, based on HSV values. Author: Theodoros Giannakopoulos color, image analysis, image retrieval, query by example 307 11
  • 3.5
3.5 | 6 ratings
20 May 2008 Screenshot Generate Animated GIF Files for Plotting Audio Data This m-file generates a animated GIF file that visualizes audio data. Author: Theodoros Giannakopoulos animated gif, video processing, animation, audio visulization, audio data, audio processing 266 1
  • 5.0
5.0 | 1 rating
23 Apr 2008 Screenshot Audio Filter GUI DEMO This demo provides a simple GUI for basic filtering of audio data. Author: Theodoros Giannakopoulos video processing, sound, filtering, audio, speech, audio processing 235 0
21 Apr 2008 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 zero crossng r, video processing, microphone, camera, audio processing 371 6
  • 4.8
4.8 | 5 ratings
 

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