Rank: 446 based on 172 downloads (last 30 days) and 4 files submitted
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Daniel Lopes

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Professional Interests:
Medical Image Processing, Geometric Modeling, Computer Vision, Computer Graphics, Scientific Visualization

 

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03 Jan 2013 Screenshot Are Two Ellipsoids in Contact? Algebraic Separation Condition for Ellipsoids An algebraic expression for characterizing the 3-D spatial configurations formed by two ellipsoids. Author: Daniel Lopes collision detection, contact detection, ellipsoid, proximity query 10 0
06 Nov 2007 drawline Draws line segments on a image matrix. Author: Daniel Lopes annotation, line, draw, customization, image, label 16 7
  • 4.28571
4.3 | 7 ratings
16 May 2007 Anisotropic Diffusion (Perona & Malik) A set of filters that perform 1D, 2D and 3D conventional anisotropic diffusion (gray scale data). Author: Daniel Lopes anisotropic, filtering, diffusion, scalespace, perona, malik 142 25
  • 4.33333
4.3 | 18 ratings
08 May 2007 beepbeep Creates sound composed by OS beeps. Author: Daniel Lopes beep, audio, alarm, warning, sound 4 1
  • 2.0
2.0 | 1 rating
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18 Mar 2013 Determination of the minimum distance between two SuperEllipsoids surfaces. Using Optimization Optimization method to determine the minimum distance (or max overlap) between two SuperEllipsoids? Author: Ricardo Portal

Nice job! The code looks very tidy and neat.
28 Feb 2013 boundedline: line plots with shaded error/confidence intervals Plot one or more lines with a shaded boundary (can represent error, confidence intervals, etc). Author: Kelly Kearney

Works like a charm! Great code.
27 Aug 2012 Ellipsoid fit Fits an ellipsoid to data using linear least squares. Author: Yury Petrov

Well done!
27 Aug 2012 Sphere Fit (least squared) Fits a sphere to a set of noisy data. Does not require a wide arc or many points. Author: Alan Jennings

Great piece of code!
25 Sep 2011 NURBS Toolbox by D.M. Spink NURBS Toolbox by D.M. Spink re-uploaded. The previous link has broken. Author: Paul Zhang

There are bugs that make this toolbox uncompatible with the Nurbs2IGES
(http://www.mathworks.com/matlabcentral/fileexchange/12087-nurbs2iges).
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08 Feb 2013 Anisotropic Diffusion (Perona & Malik) A set of filters that perform 1D, 2D and 3D conventional anisotropic diffusion (gray scale data). Author: Daniel Lopes Przem

the code here: http://www.mathworks.com/matlabcentral/fileexchange/31204-anisodiff-in-matlab/content/anisodiff.m

makes more sense. it is the actual 4 point PDE as propsed in the perona-malik paper
03 Dec 2012 Anisotropic Diffusion (Perona & Malik) A set of filters that perform 1D, 2D and 3D conventional anisotropic diffusion (gray scale data). Author: Daniel Lopes Singh, Reena Singh

thanx fr the code it is easy to understand bt in the perona-malik paper divergence is taken for the diffusion process nd in dis code diff-image is calculated in some different way. can u plz explain m dis?
07 Aug 2012 Anisotropic Diffusion (Perona & Malik) A set of filters that perform 1D, 2D and 3D conventional anisotropic diffusion (gray scale data). Author: Daniel Lopes Andre

Arif Harmanci, if you input a column vector as required by the code you should get the expected behaviour. (in your example, just changing a_n to a_n' in the function call is sufficient).
11 Jul 2012 Anisotropic Diffusion (Perona & Malik) A set of filters that perform 1D, 2D and 3D conventional anisotropic diffusion (gray scale data). Author: Daniel Lopes Ntokas, George

I have a question:at the example in Anisodiff2D you wrote this line: s = phantom(512) + randn(512).The number 512 is about memory wright?But what exactly?And how i can use another image?Thank you in advance.
04 Jun 2012 Anisotropic Diffusion (Perona & Malik) A set of filters that perform 1D, 2D and 3D conventional anisotropic diffusion (gray scale data). Author: Daniel Lopes Nie, Jiucheng

for the 2D case: why all the flux from 8 directions are summed up? The paper suggests to use flus(north)-flus(south) and so on. There at least is 'minus' instead 'plus' all the way around. Could you explain me why?
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anisotropic, annotation, collision detection, contact detection, customization
Files Tagged by Daniel View all
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
03 Jan 2013 Screenshot Are Two Ellipsoids in Contact? Algebraic Separation Condition for Ellipsoids An algebraic expression for characterizing the 3-D spatial configurations formed by two ellipsoids. Author: Daniel Lopes collision detection, contact detection, ellipsoid, proximity query 10 0
06 Nov 2007 drawline Draws line segments on a image matrix. Author: Daniel Lopes annotation, line, draw, customization, image, label 16 7
  • 4.28571
4.3 | 7 ratings
16 May 2007 Anisotropic Diffusion (Perona & Malik) A set of filters that perform 1D, 2D and 3D conventional anisotropic diffusion (gray scale data). Author: Daniel Lopes anisotropic, filtering, diffusion, scalespace, perona, malik 142 25
  • 4.33333
4.3 | 18 ratings

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