Rank: 197 based on 471 downloads (last 30 days) and 13 files submitted
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Tolga Birdal

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Gravi Information Technologies and Consultancy Ltd

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Check out my company Gravi: www.gravi.com.tr/en

Check out my personal website: www.tbirdal.me


 

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Files Posted by Tolga Birdal View all
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(last 30 days)
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29 Oct 2014 tolgabirdal/averaging_quaternions This function computes the average (mean) quaternion. Author: Tolga Birdal rotation, mean, average, quaternion, mean rotation, mean quaternion 10 1
  • 5.0
5.0 | 2 ratings
28 Aug 2014 Screenshot ICP Registration using Efficient Variants and Multi-Resolution Scheme A fast, robust ICP, which is designed to work in hard scenarios e.g. clutter or bad initializations Author: Tolga Birdal iterative closest poi..., icp, registration, pose estimation, 3d, correspondence 49 0
  • 5.0
5.0 | 1 rating
07 Jul 2014 Screenshot Stable Sampling of Point Clouds for ICP Registration The function implements the sampling strategy of Geometrically Stable Sampling for the ICP Algorithm Author: Tolga Birdal icp, iterative closest poi..., point cloud, sampling, eigenvector, covariance 33 0
31 May 2012 Fast Noise Estimation in Images Estimate the standard deviation of the noise in a gray-scale image. Author: Tolga Birdal image processing, statistics, computer vision, noise estimation, fast, variance 52 0
  • 4.0
4.0 | 1 rating
26 Feb 2012 Screenshot Simple Edge Detection Using Classical Haralick Method Implementation of the well known Haralick Edge Detector. Author: Tolga Birdal edge detection, haralick, image processing, features, low level computer vi... 20 0
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05 Mar 2014 Hausdorff Distance Hausdorff Distance Author: Baba Dash

04 Nov 2013 Smoothing 2D Contours Using Local Regression Lines This submission contains both the implementation and the test function for 2D contour smoothing. Author: Tolga Birdal

Dear Adil,

Normally, the binary region is assumed to be filled, so that MATLAB's trace methods would work. However, it occurs to me that the problem is not in tracing, but MATLAB cannot locate the initial point to begin trace. This might be due to the mis-selection of initial direction. Can you send me your data?

30 Sep 2013 tolgabirdal/averaging_quaternions This function computes the average (mean) quaternion. Author: Tolga Birdal

Note that on 2001 Claus Gramkow showed that the naive mean is in fact a fair approximation of rotations:
http://www.soest.hawaii.edu/wessel/courses/gg711/pdf/Gramkow_2001_JMIV.pdf

I think re-orthagonalization using SVD after a standard averaging would suffice most applications.

19 Aug 2012 fitcircle.m Fits circles to 2D data using nonlinear least squares to minimise geometric error Author: Richard Brown

Richard,

I appreciate your effort and this great function. I would just want to remind that (and I am sure you already know) for the nonlinear part it is also possible to use:

options = optimset('Jacobian','on', 'Algorithm','levenberg-marquardt');
u = lsqnonlin(@sys,u,[],[],options);

Did you do any comparisons of accuracy? (Because Walter states that Gauss-Newton performed similarly, while being more efficient)

Cheers,

22 Apr 2012 m-sequence generation program Generates multiple binary, ternary, and five level m-sequences Author: Giedrius Buracas

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24 Nov 2014 ICP Registration using Efficient Variants and Multi-Resolution Scheme A fast, robust ICP, which is designed to work in hard scenarios e.g. clutter or bad initializations Author: Tolga Birdal John

29 Oct 2014 Fast Inpolygon in MEX Fast inpolygon function implemented in MEX. So far one of the fastest. Author: Tolga Birdal Roger GALLOU

Tolga

I have made few tests with erractic errors. Comportment of DLL is very perturbated, ie :
x = 0.5;
y = 0.5;
xv = [0 1 1 0];
yv = [0 0 1 1];
[IN ON] = inpolygon_fast(x, y, [xv xv(1)], [yv yv(1)]);

Results could be sometimes 0 or 1 for the same MatLab session !!!
I do not have time to look further, but this feature requires substantial improvements.

02 Jun 2014 tolgabirdal/averaging_quaternions This function computes the average (mean) quaternion. Author: Tolga Birdal Mosong Cheng

17 Feb 2014 Simple Face Detection Implementation of A SIMPLE AND ACCURATE COLOR FACE DETECTION ALGORITHM IN COMPLEX BACKGROUND Author: Tolga Birdal haem

30 Jan 2014 tolgabirdal/averaging_quaternions This function computes the average (mean) quaternion. Author: Tolga Birdal sathish

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