Rank: 300 based on 266 downloads (last 30 days) and 7 files submitted
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tudor dima

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Company/University
Universitat de Valencia
Lat/Long
39.508, -0.42095

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Professional Interests:
RF system, discrete and integrated circuit design and simulation, Medical Image Analysis, Finite Difference methods for PDE

 

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Files Posted by tudor View all
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19 Feb 2013 Screenshot Image segmentation - multiscale energy-based level sets Segmentation using active contour without edges and multi-scale acceleration. GUI included Author: tudor dima image segmentation, level set, active contours, multiscale, image processing 138 13
  • 5.0
5.0 | 6 ratings
12 Sep 2012 Screenshot input impedance converter : S11, Z, Y (1 complex value) reflection coef. converter: S11 -impedance -admittance -Return Loss -VSWR; graphical & text input Author: tudor dima impedance, vswr, wireless, admittance, z, y 28 2
  • 5.0
5.0 | 2 ratings
29 May 2012 S-parameter toolbox (+ Z, Y, H, G, ABCD, T) Convert between N-port representations of RF circuits. Read / Write industry-standard files. Author: tudor dima abcd, s2p, snp, wireless, s parameters, touchstone 73 20
  • 4.9375
4.9 | 16 ratings
30 Apr 2012 Screenshot bmorph - binary morphological transforms Fast binary erosion and dilation, with even faster iterative calls. Author: tudor dima image processing, morphology, erosion, dilation, binary, morphological transfo... 7 3
  • 5.0
5.0 | 1 rating
01 Sep 2011 Screenshot 2D histogram - 'exact' and 'fast' binning, 'crop' and 'stretch' grid adjustment 2D histogram of data pairs [x,y]; 'fast'/'exact' binning; 'stretch'/'crop' grid mode. Author: tudor dima statistics, probability, histogram, 2d, 2 d, box counting 8 2
  • 5.0
5.0 | 2 ratings
Comments and Ratings by tudor View all
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16 Nov 2012 Fifteens Goal is to arrange 15 numbered squares in the 4x4 field. Author: Kirill K. Pankratov

oldies by goldies ... thanks!
And pretty impressive for 10 year-old code, all I had to do in order to make it run in 2010b was to edit line 27 from:
if fnd~=[]
to:
if ~isempty(fnd)

The plastic "perspico" was a huge hit in Romania when I was a kid. Numbers came in two colours (blue/red for odd/even) and on the back it had 6 (or maybe 9?) different output solutions to reach. (the normal 1-15 was called "horizontal", then "vertical", "spiral", "random" (a jumble everyone avoided), "total 30" and "impossible" which was 15:-1:1 , of course unreachable due to its opposite parity.
Thanks, this made my day :-)
16 Nov 2012 Fifteen This is a Graphical User Interface for playing and solving the 15-Puzzle game. Author: Mihir Shah

It doesn't work in R2010b. (v.7.11)
25 Jun 2012 MULTIPLOT2 - Multiplot version for version prior to R2007a (do not use inputParser) 2D-line plots on several axes with common x-axis Author: Thomas Montagnon

Brilliant, thank you!
I've added 'FigNo' as an optional parameter, this way one can keep updating the same window.
25 Jun 2012 Image segmentation - multiscale energy-based level sets Segmentation using active contour without edges and multi-scale acceleration. GUI included Author: tudor dima

@Javier
While drawing the initial contour follow the messages in the command window.

At load time (whether from image or .mat file) keep scale depth at 0 if you want to start at the finest resolution. (I suspect you load a ~72x72 array and have kmax set at 3?)

Will look into adding capability to load an initial contour. What is in there already is the ability to save the level-set function and re-use it. (Say once you have input a complicated initialization, you don't want to go through it every time, so you can save it and load it over. However, the image data has to be of the same size.
25 May 2012 Image segmentation - multiscale energy-based level sets Segmentation using active contour without edges and multi-scale acceleration. GUI included Author: tudor dima

Hi, Marcos,

For starters, there is a very short description under Help | Buttons.

You can try the Chan-Vese paper I referenced higher in the abstract (no. [2])

The normalization you mention is done precisely in order to decouple the parameters value from the actual image values (which could come as uint8, uint16, 0-1, or any other data).
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25 Jun 2012 Image segmentation - multiscale energy-based level sets Segmentation using active contour without edges and multi-scale acceleration. GUI included Author: tudor dima dima, tudor

@Javier
While drawing the initial contour follow the messages in the command window.

At load time (whether from image or .mat file) keep scale depth at 0 if you want to start at the finest resolution. (I suspect you load a ~72x72 array and have kmax set at 3?)

Will look into adding capability to load an initial contour. What is in there already is the ability to save the level-set function and re-use it. (Say once you have input a complicated initialization, you don't want to go through it every time, so you can save it and load it over. However, the image data has to be of the same size.
19 Jun 2012 Image segmentation - multiscale energy-based level sets Segmentation using active contour without edges and multi-scale acceleration. GUI included Author: tudor dima Javier

Hi,

another question: when I load a .mat with a double image (the variable is g0 as commented in the code) and then I press "DO Iter" I only see 9 pixels of my image. What can I do?

Thanks

18 Jun 2012 Image segmentation - multiscale energy-based level sets Segmentation using active contour without edges and multi-scale acceleration. GUI included Author: tudor dima Javier

Hi,

thanks for sharing the code. I'm having troubles to create a manual initial contour. I select the option Ini. Method "draw" and then I press the button "DO Iter!" but I can't select points with the mouse. What am I doing wrong?

Another question: If I have already the initial contour as a binary mask, can I avoid the function "iniMembrane"?

Thank you very much
25 May 2012 Image segmentation - multiscale energy-based level sets Segmentation using active contour without edges and multi-scale acceleration. GUI included Author: tudor dima dima, tudor

Hi, Marcos,

For starters, there is a very short description under Help | Buttons.

You can try the Chan-Vese paper I referenced higher in the abstract (no. [2])

The normalization you mention is done precisely in order to decouple the parameters value from the actual image values (which could come as uint8, uint16, 0-1, or any other data).
24 May 2012 Image segmentation - multiscale energy-based level sets Segmentation using active contour without edges and multi-scale acceleration. GUI included Author: tudor dima Belmonte, Marcos

Hi,I'm doing my final project of the degree and I haven't a lot of experience so, it's hard for me to follow so much lines of code. I was wondering if you had a paper explaining this guide: the differential equations you employed for the method or something like this. I have proved your method and I really like the results but I want to understand how the parameters affect in order to get better results.

By the way, my images are double and of 16 bits and
approx at lines 840-841 I see:
MaxGVal = max(g(:));
g = g * (255/MaxGVal);

Does it affect my intensity values? It is necessary? Thank you very much!
Top Tags Applied by tudor
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image processing, 2d, s parameters, sparameters, wireless
Files Tagged by tudor View all
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
19 Feb 2013 Screenshot Image segmentation - multiscale energy-based level sets Segmentation using active contour without edges and multi-scale acceleration. GUI included Author: tudor dima image segmentation, level set, active contours, multiscale, image processing 138 13
  • 5.0
5.0 | 6 ratings
12 Sep 2012 Screenshot input impedance converter : S11, Z, Y (1 complex value) reflection coef. converter: S11 -impedance -admittance -Return Loss -VSWR; graphical & text input Author: tudor dima impedance, vswr, wireless, admittance, z, y 28 2
  • 5.0
5.0 | 2 ratings
29 May 2012 S-parameter toolbox (+ Z, Y, H, G, ABCD, T) Convert between N-port representations of RF circuits. Read / Write industry-standard files. Author: tudor dima abcd, s2p, snp, wireless, s parameters, touchstone 73 20
  • 4.9375
4.9 | 16 ratings
30 Apr 2012 Screenshot bmorph - binary morphological transforms Fast binary erosion and dilation, with even faster iterative calls. Author: tudor dima image processing, morphology, erosion, dilation, binary, morphological transfo... 7 3
  • 5.0
5.0 | 1 rating
01 Sep 2011 Screenshot 2D histogram - 'exact' and 'fast' binning, 'crop' and 'stretch' grid adjustment 2D histogram of data pairs [x,y]; 'fast'/'exact' binning; 'stretch'/'crop' grid mode. Author: tudor dima statistics, probability, histogram, 2d, 2 d, box counting 8 2
  • 5.0
5.0 | 2 ratings

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