Rank: 617 based on 173 downloads (last 30 days) and 4 files submitted
photo

George Azzopardi

E-mail
Company/University
University of Groningen

Personal Profile:
Professional Interests:
Contour detection, computational model, simple cell

 

Watch this Author's files

 

Files Posted by George View all
Updated   File Tags Downloads
(last 30 days)
Comments Rating
28 Aug 2014 Screenshot Contour Detection with the Push Pull CORF model Contour detection by a computational model of the push-pull inhibition of simple cells Author: George Azzopardi contour detection, simple cell, pushpull inhibition, corf, signal to noise ratio, orientationselective 60 0
03 Jan 2014 Screenshot Trainable COSFIRE filters for keypoint detection and pattern recognition A COSFIRE filter detects features or patterns of interest, e.g. traffic signs in complex scenes. Author: George Azzopardi cosfire, keypoint, feature, detection, keypoint detection, feature detection 36 0
04 Dec 2013 Screenshot Contour detection by CORF operator The CORF contour operator is based on a computational model of a simple cell in visual cortex. Author: George Azzopardi edge detection, contour detection, visual cortex, simple cell, gabor, signal processing 20 6
21 Jan 2013 Screenshot Self-Organizing Map - Simple demonstration A simple and neat implementation of a self-organizing map algorithm Author: George Azzopardi selforganizing map, som, neural networks, vector quantization, prototypes, machine learning 57 8
  • 4.0
4.0 | 1 rating
Comments and Ratings by George View all
Updated File Comments Rating
19 Jul 2014 Self-Organizing Map - Simple demonstration A simple and neat implementation of a self-organizing map algorithm Author: George Azzopardi

I guess the problem is with the imagesc function. It expects the values to be between 0 and 1. You can try to divide with the maximum value before calling the imagesc function.

13 Jan 2014 Contour detection by CORF operator The CORF contour operator is based on a computational model of a simple cell in visual cortex. Author: George Azzopardi

Hi Hemo, could you kindly provide the statement that you are running and send me (email: geazzo<at>gmail<dot>com) the image file that you are trying to process?

17 Oct 2013 Contour detection by CORF operator The CORF contour operator is based on a computational model of a simple cell in visual cortex. Author: George Azzopardi

Thanks Richard. I will update the script.

25 Jun 2013 Self-Organizing Map - Simple demonstration A simple and neat implementation of a self-organizing map algorithm Author: George Azzopardi

Could you write the Matlab command that you are using to call the SOMSImple function?

I suggest that you read the article called "Self-Organizing Map-Based Color Image Segmentation with k-Means Clustering and Saliency Map" which you can find in http://www.hindawi.com/isrn/sp/2011/393891/

24 Jun 2013 Self-Organizing Map - Simple demonstration A simple and neat implementation of a self-organizing map algorithm Author: George Azzopardi

Hi Lim, could you kindly elaborate further on your question? An SOM is a unsupervised clustering method which can be used for dimensionality reduction. In thsi simple example I am initializing a matrix of 3D neurons such that I can show them as RGB values. I wish you can be more specific such that I can help you better.

Comments and Ratings on George's Files View all
Updated File Comment by Comments Rating
19 Jul 2014 Self-Organizing Map - Simple demonstration A simple and neat implementation of a self-organizing map algorithm Author: George Azzopardi Azzopardi, George

I guess the problem is with the imagesc function. It expects the values to be between 0 and 1. You can try to divide with the maximum value before calling the imagesc function.

19 Jul 2014 Self-Organizing Map - Simple demonstration A simple and neat implementation of a self-organizing map algorithm Author: George Azzopardi sam

I have question : if I want to feed the SOM with my input and the input are integer.

% Generate random training data
trainingData = rand(ntrainingvectors,nfeatures) * 10 ; <----- int values

it does not accept that and complain.

************************************************************
Error using image
TrueColor CData contains element out of range 0.0 <= value <= 1.0

Error in imagesc (line 19)
hh = image(varargin{1},'CDataMapping','scaled');

Error in SOMSimple>displaySOMmap (line 127)
imagesc(sommap(:,:,1:3));

Error in SOMSimple (line 100)
displaySOMmap(fig, 2, ['Epoch: ',num2str(t),'/',num2str(nepochs),', Training
Vector: ',num2str(ntraining),'/',num2str(ntrainingvectors)], som, nfeatures);

Error in SOMSimpleMain (line 36)
SOMSimple(3,60,10,100,0.1,0.05,20,0.05,2)
**********************************************************
what is the solution?

13 Jan 2014 Contour detection by CORF operator The CORF contour operator is based on a computational model of a simple cell in visual cortex. Author: George Azzopardi Azzopardi, George

Hi Hemo, could you kindly provide the statement that you are running and send me (email: geazzo<at>gmail<dot>com) the image file that you are trying to process?

13 Jan 2014 Contour detection by CORF operator The CORF contour operator is based on a computational model of a simple cell in visual cortex. Author: George Azzopardi khalifa, Hemo

can you please tell me why it doesn't work with me when I run it, it gives me an error (undefined function)]

06 Dec 2013 Contour detection by CORF operator The CORF contour operator is based on a computational model of a simple cell in visual cortex. Author: George Azzopardi Gore, Akshay

Please send me paper

"Contour Detection by CORF Operator"
George Azzopardi, Nicolai Petkov
Artificial Neural Networks and Machine Learning – ICANN 2012

Akshay Gore
akshaygore@gmail.com

Contact us