Rank: 399 based on 283 downloads (last 30 days) and 4 files submitted
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Files Posted by natan View all
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25 Oct 2013 Screenshot Polar Onion Peeling Apply polar onion peeling method for analyzing velocity map imaging (VMI) data. Author: natan onion peeling, physics, chemistry, image processing 21 2
11 Oct 2013 Screenshot Fast 2D peak finder Find local maxima \ peak positions in noisy 2D arrays Author: natan peakfind, peak, local maxima, image processing, signal processing, centroid 187 12
  • 5.0
5.0 | 6 ratings
03 Dec 2012 Screenshot Gaussian beam propagation through a series of thin lenses Propagates a Gaussian beam through a series of thin lenses Author: natan gaussian optics, beam, propagation, optics, simulation 44 0
  • 5.0
5.0 | 1 rating
05 Jul 2012 Screenshot 1D Blaise filter for quick smoothing without Curve Fitting Toolbox Basic 1D smoothing of noisy data according to predetermined weights and window size. Author: natan smooth, filter, signal processing 31 0
Comments and Ratings by natan View all
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10 May 2014 Fast 2D peak finder Find local maxima \ peak positions in noisy 2D arrays Author: natan

The default filter matrix is a 7x7 Gaussian, and the smoothing is done via 2D convolution of the image with that filter. If you don't understand why this smooths the data you can refer to this simple demo (http://blogs.mathworks.com/videos/2012/04/17/using-convolution-to-smooth-data-with-a-moving-average-in-matlab/). The size of the filter was selected for typical PSF's, and what it does is to take the weighted average for each pixel with it's 7x7 pixels surrounding it (so it's a moving average), where the weights are normally distributed (hence a Gaussian). If you have more questions email me.

23 Apr 2014 Data space to figure units conversion A utility function to simplify use of annotation function Author: Michelle Hirsch

Please consider adding functionality for the case PlotBoxAspectRatio is not [1 1 1] (in case axis image for example)

07 Apr 2014 Scalable Vector Graphics (SVG) Export of Figures Converts 3D and 2D MATLAB plots to the scalable vector format (SVG). Author: Juerg Schwizer

Is there an easy way to use this function for figures where the colormap has more than 256 colors?

14 Oct 2013 Polar Onion Peeling Apply polar onion peeling method for analyzing velocity map imaging (VMI) data. Author: natan

@Luis, if you press "Download Submission" you'll get a zip file (pop.zip) that contains also delta_lut.mat ...

11 Oct 2013 Fast 2D peak finder Find local maxima \ peak positions in noisy 2D arrays Author: natan

@Dan, I've added a sub-pixel resolution centroid feature to the code...

Comments and Ratings on natan's Files View all
Updated File Comment by Comments Rating
10 May 2014 Fast 2D peak finder Find local maxima \ peak positions in noisy 2D arrays Author: natan natan

The default filter matrix is a 7x7 Gaussian, and the smoothing is done via 2D convolution of the image with that filter. If you don't understand why this smooths the data you can refer to this simple demo (http://blogs.mathworks.com/videos/2012/04/17/using-convolution-to-smooth-data-with-a-moving-average-in-matlab/). The size of the filter was selected for typical PSF's, and what it does is to take the weighted average for each pixel with it's 7x7 pixels surrounding it (so it's a moving average), where the weights are normally distributed (hence a Gaussian). If you have more questions email me.

09 May 2014 Fast 2D peak finder Find local maxima \ peak positions in noisy 2D arrays Author: natan Jochen

Thanks a lot for that brilliant function!
But I don't understand how the filter matrix is supposed to look like to smooth the image. Can you give me hint?
Thanks!

18 Apr 2014 Fast 2D peak finder Find local maxima \ peak positions in noisy 2D arrays Author: natan Andrey

14 Oct 2013 Polar Onion Peeling Apply polar onion peeling method for analyzing velocity map imaging (VMI) data. Author: natan natan

@Luis, if you press "Download Submission" you'll get a zip file (pop.zip) that contains also delta_lut.mat ...

14 Oct 2013 Polar Onion Peeling Apply polar onion peeling method for analyzing velocity map imaging (VMI) data. Author: natan Luis

Tried to test it but couldn't find delta_lut.mat, thanks

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