Rank: 288 based on 213 downloads (last 30 days) and 7 files submitted
photo

tudor dima

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

Personal Profile:

football and more :)

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

 

Watch this Author's files

 

Files Posted by tudor View all
  • 1 - 5 of
  • 7
Updated   File Tags Downloads
(last 30 days) 		Comments Rating
30 Sep 2011 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 s2p, abcd, snp, wireless, s parameters, rf 67 18
  • 4.9375
4.9 | 16 ratings
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 19 2
  • 5.0
5.0 | 2 ratings
16 Aug 2011 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 87 3
05 Jul 2011 Screenshot HTML Indexer automated multi-language html index, index for print, batch image scaling Author: tudor dima gui, html gallery, annotation, html, image scale, index print 7 3
  • 5.0
5.0 | 3 ratings
02 Mar 2010 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 17 2
  • 5.0
5.0 | 2 ratings
Comments and Ratings by tudor View all
  • 1 - 5 of
  • 6
Updated File Comments Rating
08 Nov 2011 Inpaint over missing data in N-D arrays Y = INPAINTN(X) replaces the missing data in X by extra/interpolating the non-missing elements. Author: Damien Garcia

Great work, extremely useful, it works out of the box.
Thanks a lot for posting it!

Would there be a simple way to restrict calculations inside a "gating mask"?
02 Nov 2011 3D Euclidean Distance Transform for Variable Data Aspect Ratio Implementation of 3D Euclidean distance transform for data with non-trivial aspect ratio. Author: Yuriy Mishchenko
30 Sep 2011 Image segmentation - multiscale energy-based level sets Segmentation using active contour without edges and multi-scale acceleration. GUI included Author: tudor dima

@Qwuasi Moore - I am not sure I understand what you mean. The evolution rule is solved discreetly using an FD method, I suppose (and this is just a wild guess) that it would be possible to write an FEM solution. I assume you'd encounter similar issues (mainly execution speed, and the infamous convergence issues)

@Pooja
Depending on how your images look like you might want to choose your segmentation method. This one in particular is powerful when dealing with fuzzy and/or incomplete contours, low gradients, etc. (f.i. environments with noise and jitter)
21 Dec 2010 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

@Matthew
Great to hear that!

Sure, please send the files over and I'll have a look; it was about time I did a revision of the whole box.
12 Jul 2010 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

@Chris
Yes, that's absolutely right.
One note: in case your data is closer to a singularity (for instance during calibrations when data exhibits extremely low or high return losses) then it's a good practice to doublecheck the above using :

a1 = s2a(s1);
a2 = s2a(s2);
s_12_a = a2s(a1*a2);

and then compare the results; (it was not your case, here the maximum delta is 2.2215e-016 -- using max(abs(s_12_a(:)-s(:)))

Comments and Ratings on tudor's Files View all
  • 1 - 5 of
  • 35
Updated File Comment by Comments Rating
12 Jan 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 Lee, Tao Yi

I suggest a minor modification in SXPParse.m for robustness.

At line 55.

% --- find out matrix order ---
    [~, NoOfPorts] = strtok(DataFileName, '.');
    NoOfPorts = strtok(NoOfPorts, 'p');
    NoOfPorts = str2double(NoOfPorts(3:end));
12 Jan 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 Lee, Tao Yi
08 Dec 2011 bmorph - binary morphological transforms Fast binary erosion and dilation, with even faster iterative calls. Author: tudor dima Alexander

Great code! Very useful if you don't have the Image Processing Toolbox.

One question: how do you set up the 'circular' structuring element? This seems to be where you get the speed advantage, but I'm not sure how you implement. Thanks.
07 Nov 2011 bmorph - binary morphological transforms Fast binary erosion and dilation, with even faster iterative calls. Author: tudor dima Sklios, ssklios

much faster! This is exactly what I am looking for to use in my image processing code. However, it did not give the same results as imerode for me. Help please?
26 Oct 2011 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 Wu, David Yu-Ting

Thank you for saving me from having to write an S2P parser! Truly appreciate it!
Top Tags Applied by tudor
  • 1 - 5 of
  • 69
image processing, 2d, s parameters, sparameters, wireless
Files Tagged by tudor View all
  • 1 - 5 of
  • 7
Updated   File Tags Downloads
(last 30 days) 		Comments Rating
30 Sep 2011 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 s2p, abcd, snp, wireless, s parameters, rf 67 18
  • 4.9375
4.9 | 16 ratings
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 19 2
  • 5.0
5.0 | 2 ratings
16 Aug 2011 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 87 3
05 Jul 2011 Screenshot HTML Indexer automated multi-language html index, index for print, batch image scaling Author: tudor dima gui, html gallery, annotation, html, image scale, index print 7 3
  • 5.0
5.0 | 3 ratings
02 Mar 2010 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 17 2
  • 5.0
5.0 | 2 ratings

Contact us at files@mathworks.com