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Dirk-Jan Kroon

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Focal Machine Vision en Optical Systems

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Files Posted by Dirk-Jan View all
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06 Jun 2013 Screenshot Kinect Matlab Microsoft Kinect, OpenNI wrapper, Skeleton, Depth Author: Dirk-Jan Kroon 2d, kinect, wrapper, nite, image processing, photo 283 105
  • 4.69231
4.7 | 26 ratings
12 Jul 2012 Matrix Inverse using LU factorization Example code LU decomposition with partial pivoting, also forward substitution, and Matrix inverse. Author: Dirk-Jan Kroon inverse, matrix inverse, lu decomposition, lu factorization, pivoting, lu 22 0
26 Jun 2012 Screenshot Polygon2Voxel Convert a triangulated mesh into a voxel volume Author: Dirk-Jan Kroon mesh, voxel volume, polygons, triangles, triangulated, voxels 36 12
  • 5.0
5.0 | 6 ratings
13 Jun 2012 Tiff Tag Reader A one file implementation of Tag-reader for complex Tiff files. Author: Dirk-Jan Kroon tiff, tif, tag, header, image file directory, ifd 14 0
14 May 2012 Screenshot Corresponding Points through MDL Minimum Description Length optimization of PCA model for 2D/3D ASM model building Author: Dirk-Jan Kroon mdl, minimum description l..., pca, principal, component, analysis 36 1
  • 4.0
4.0 | 1 rating
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11 Oct 2012 Web Server HTTP Matlab Web Server, allows m-files to be executed in a browser Author: Dirk-Jan Kroon

*Filipe S.
A Matlab GUI/Figure is user-interface thus client-side, this is a webserver thus server-side.
The only way to do client-side things like showing a GUI, is manually coding the GUI in javascript, html and css

31 May 2012 Biggest Connected Component This program is an example for image processing in order to obtain the biggest connected component Author: Gholamreza (Shahab) Anbarjafari

Can be done in 3 lines, without for loops with bwlabel, hist (or accumarray) and max
24 Apr 2012 Shape Context Based Corresponding Point Models Shape Context based nonrigid registration of 2D/3D objects, to build Active Shape Models Author: Dirk-Jan Kroon

*Birgit
Knnsearch is part of the "Statistics Toolbox" of Matlab. Maybe you can find a similar but free implementation on the File Exchange
19 Dec 2011 Polygon2Voxel Convert a triangulated mesh into a voxel volume Author: Dirk-Jan Kroon

*leo,
Only integer volume sizes are supported
24 Oct 2011 Kinect Microsoft SDK Video, Audio, Depth Stream and Skeleton tracking Author: Dirk-Jan Kroon

*Tim

The x,y coordinates are aligned with the depth image, which is twice as small as the video-stream. Thus this code : x=(Pos(1:20,5)-0.5)*2; transfers the coordinates from depth to photo image.
But this is only true if the depth image and photo image are aligned, and I don't know if that is always true.
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02 Jul 2013 Hessian based Frangi Vesselness filter Enhancement of Vessel/ridge like structures in 2D/3D image using hessian eigen values Author: Dirk-Jan Kroon feng

who can tell me why there's nothing in the file "eig3volume.m"
01 Jul 2013 B-spline Grid, Image and Point based Registration B-spline registration of two 2D / 3D images or corrsp. points, affine and with smooth b-spline grid. Author: Dirk-Jan Kroon Maurits

01 Jul 2013 B-spline Grid, Image and Point based Registration B-spline registration of two 2D / 3D images or corrsp. points, affine and with smooth b-spline grid. Author: Dirk-Jan Kroon curoch

Great toolbox.

One question: is it possible to add some regularisation to the point-based registration or is one forced to use the image_registration routine with the landmark option?
26 Jun 2013 Bias Field Corrected Fuzzy C-Means Estimates the illumination artifact in 2D (color) and 3D CT and MRI and segments into classes. Author: Dirk-Jan Kroon Wells, Jered

Update: I recently updated my machine, and after recompiling BCFCM3D, it appears to be working fine. I do, however, think the code would benefit from some free(*) statements within the mallocf and mallocd subfunctions. Although I am not a C-professional, I am pretty sure that this poses a significant memory leak that quickly becomes problematic when dealing with large volumes.

24 Jun 2013 Bias Field Corrected Fuzzy C-Means Estimates the illumination artifact in 2D (color) and 3D CT and MRI and segments into classes. Author: Dirk-Jan Kroon Wells, Jered

Hi. I have been having memory issues with this code. I have been segmenting large volumes (512x512x512) so I have been monitoring my RAM consumption using Windows task manager. When running the program, it slowly but steadily consumes more RAM up until about 7GB (out of 16GB). This takes only about 2 min, but then the program runs for about 10 min and finally crashes with an "Out of Memory" error when more memory clearly exists. What's worse is that MATLAB holds onto this ~6GB chunk of memory, and no manner of memory clearing or packing gets it back. I am not a mex expert, so maybe you could shed some light on this issue? Thanks in advance.
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Files Tagged by Dirk-Jan View all
  • 1 - 5 of
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
06 Jun 2013 Screenshot Kinect Matlab Microsoft Kinect, OpenNI wrapper, Skeleton, Depth Author: Dirk-Jan Kroon 2d, kinect, wrapper, nite, image processing, photo 283 105
  • 4.69231
4.7 | 26 ratings
12 Jul 2012 Matrix Inverse using LU factorization Example code LU decomposition with partial pivoting, also forward substitution, and Matrix inverse. Author: Dirk-Jan Kroon inverse, matrix inverse, lu decomposition, lu factorization, pivoting, lu 22 0
26 Jun 2012 Screenshot Polygon2Voxel Convert a triangulated mesh into a voxel volume Author: Dirk-Jan Kroon mesh, voxel volume, polygons, triangles, triangulated, voxels 36 12
  • 5.0
5.0 | 6 ratings
13 Jun 2012 Tiff Tag Reader A one file implementation of Tag-reader for complex Tiff files. Author: Dirk-Jan Kroon tiff, tif, tag, header, image file directory, ifd 14 0
14 May 2012 Screenshot Corresponding Points through MDL Minimum Description Length optimization of PCA model for 2D/3D ASM model building Author: Dirk-Jan Kroon mdl, minimum description l..., pca, principal, component, analysis 36 1
  • 4.0
4.0 | 1 rating

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