Rank: 5 based on 3028 downloads (last 30 days) and 30 files submitted

Dirk-Jan Kroon

E-mail: Contact Author
Company/University: University of Twente

Personal Profile:
Professional Interests:

Files
Watch Lists

Files Posted by Dirk-Jan				View all 1 - 5 of 30
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
02 Mar 2010	Active Shape Model (ASM) Cootes Active Shape Model for automatic image object contour segmentation Author: Dirk-Jan Kroon	taylor, principal component a..., active shape, contour, active shape model, optimization	269	0
02 Mar 2010	Hessian based Frangi Vesselness filter Enhancement of Vessel/ridge like structures in 2D/3D image using hessian eigen values Author: Dirk-Jan Kroon	ridge detector, hessian filter, vessel detector, vessel, edge detector, vesselness filter	125	14	4.75 4.8 \| 8 ratings
16 Feb 2010	Smooth Triangulated Mesh Accurate smoothing of triangulated patch / mesh Author: Dirk-Jan Kroon	edge, triangle, vertices, mesh, curvature flow, laplacian	113	1	5.0 5.0 \| 1 rating
16 Feb 2010	Triangular Mesh Refinement This function will refine a triangular mesh with 4-split spline interpolation Author: Dirk-Jan Kroon	refinement, triangular, mesh, surface, spline, edges	105	5	4.0 4.0 \| 3 ratings
12 Feb 2010	Polygon2Voxel Convert a triangulated mesh into a voxel volume Author: Dirk-Jan Kroon	polygons, mesh, voxel, voxel volume, triangles, voxels	79	2	5.0 5.0 \| 2 ratings

Comments and Ratings by Dirk-Jan		View all 1 - 5 of 38
Updated	File	Comments	Rating
15 Feb 2010	multimodality non-rigid demon algorithm image registration non-rigid 2D and 3D image registration with demon (fluid) algorithm, extended with modality transf. Author: Dirk-Jan Kroon	*Vijay Denoising the data before registration is not really needed, but when done with an edge preserving filter, it will slightly improve the final results.
13 Jan 2010	non-rigid b-spline grid image registration Registration of two 2D/3D images, rigid and with smooth b-spline grid. Author: Dirk-Jan Kroon	Note: bug in manually_warp_images (will be fixed in next update). Replace line 279 with: [j,i]=ind2sub([size(data.Grid,2) size(data.Grid,1)],data.pointselected);
04 Jan 2010	Volume Render Volume Render GUI with mouse change able color and alpha maps Author: Dirk-Jan Kroon	*Jenny That only your real data works and not your synthetic is probably caused by the data-type of your volume and value-range of your data. Maybe you have to convert the data first to uint8 with a range of 0...255 before you can use the viewer.
05 Dec 2009	multimodality non-rigid demon algorithm image registration non-rigid 2D and 3D image registration with demon (fluid) algorithm, extended with modality transf. Author: Dirk-Jan Kroon	*gx, The equation "bins=round(numel(V)^(1/ndims(V)));" is not from literature. You can also use a fix bin size of 255, or so. - Mutual information only works if there are overlaps in the histogram bins. - More histogram bins will give better registration accuracy. Thus this equation gives a good trade-off based on the number of available pixels ...
05 Dec 2009	non-rigid b-spline grid image registration Registration of two 2D/3D images, rigid and with smooth b-spline grid. Author: Dirk-Jan Kroon	*Alex Kararg, The function maxNumCompThreads is a build-in function which returns the number of cores in the computer. If it doesn't exist in your Matlab you simply create the function your self like: function a=maxNumCompThreads() a=2;

Comments and Ratings on Dirk-Jan's Files			View all 1 - 5 of 234
Updated	File	Comment by	Comments	Rating
11 Mar 2010	non-rigid b-spline grid image registration Registration of two 2D/3D images, rigid and with smooth b-spline grid. Author: Dirk-Jan Kroon	Ibrahim, medical imaging	I have used this implementation as a step in one of my analysis systems, could you please tell me the paper that I should reference for this work ?
05 Mar 2010	Accurate Fast Marching Multistencils second order Fast Marching 2D and 3D including rk4 shortest path tracing Author: Dirk-Jan Kroon	Daniela	The code is easy to understand, but the speed function must be between [1e-8,1], otherwise you get a complex number to value of T, where T is arrival time - this is not correct. Anybody observe/solve that? Notice that such a constraint for F is theoretically wrong.
17 Feb 2010	Smooth Triangulated Mesh Accurate smoothing of triangulated patch / mesh Author: Dirk-Jan Kroon	Deng, Siyi	very helpful. Excellent code with great documentation.
15 Feb 2010	multimodality non-rigid demon algorithm image registration non-rigid 2D and 3D image registration with demon (fluid) algorithm, extended with modality transf. Author: Dirk-Jan Kroon	Kroon, Dirk-Jan	*Vijay Denoising the data before registration is not really needed, but when done with an edge preserving filter, it will slightly improve the final results.
14 Feb 2010	FMINLBFGS: Fast Limited Memory Optimizer Quasi newton limited memory BFGS and Steepest decent optimizer for large amount of unknowns Author: Dirk-Jan Kroon	Tomonori	I encountered an occasion which potentially indicates bug. When the initial parameter sets gives the minimum value of the optimization function, the return values (at least x and fval) of fminlbfgs are empty, which could halt applications utilizing this subfunction. I'm not familiar with the internal process of this subfunction and could not figure out which line needs to be modified, but from the observed input-output relationship, I guess zero repetition results in empty output. If you have references for this optimization methods, would you mind letting us know?

Top Tags Applied by Dirk-Jan	1 - 5 of 274
3d, 2d, color, image, mesh

Files Tagged by Dirk-Jan				View all 1 - 5 of 30
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
02 Mar 2010	Active Shape Model (ASM) Cootes Active Shape Model for automatic image object contour segmentation Author: Dirk-Jan Kroon	taylor, principal component a..., active shape, contour, active shape model, optimization	269	0
02 Mar 2010	Hessian based Frangi Vesselness filter Enhancement of Vessel/ridge like structures in 2D/3D image using hessian eigen values Author: Dirk-Jan Kroon	ridge detector, hessian filter, vessel detector, vessel, edge detector, vesselness filter	125	14	4.75 4.8 \| 8 ratings
16 Feb 2010	Smooth Triangulated Mesh Accurate smoothing of triangulated patch / mesh Author: Dirk-Jan Kroon	edge, triangle, vertices, mesh, curvature flow, laplacian	113	1	5.0 5.0 \| 1 rating
16 Feb 2010	Triangular Mesh Refinement This function will refine a triangular mesh with 4-split spline interpolation Author: Dirk-Jan Kroon	refinement, triangular, mesh, surface, spline, edges	105	5	4.0 4.0 \| 3 ratings
12 Feb 2010	Polygon2Voxel Convert a triangulated mesh into a voxel volume Author: Dirk-Jan Kroon	polygons, mesh, voxel, voxel volume, triangles, voxels	79	2	5.0 5.0 \| 2 ratings

Currently Watching
Type	Description
File	multimodality non-rigid demon algorithm image registration
File	Viewer3D
File	Pinch and Spherize Filter
File	non-rigid b-spline grid image registration
File	FMINLBFGS: Fast Limited Memory Optimizer
File	Polygon2Voxel

Files Matching Dirk-Jan's Watch List				View all 1 - 5 of 6
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
12 Feb 2010	Polygon2Voxel Convert a triangulated mesh into a voxel volume Author: Dirk-Jan Kroon	polygons, mesh, voxel, voxel volume, triangles, voxels	79	2	5.0 5.0 \| 2 ratings
11 Jan 2010	non-rigid b-spline grid image registration Registration of two 2D/3D images, rigid and with smooth b-spline grid. Author: Dirk-Jan Kroon	registration, 2d, nonrigid, bspline, 3d, c mex	214	77	4.75 4.8 \| 12 ratings
01 Oct 2009	Viewer3D MIP, Color, Slice and Shaded 3D (shearwarp) Volume Rendering, interactive 3D view/measurement GUI Author: Dirk-Jan Kroon	3d, image, shearwarp, interactive, isosurface render, rays	120	14	4.83333 4.8 \| 6 ratings
01 Oct 2009	multimodality non-rigid demon algorithm image registration non-rigid 2D and 3D image registration with demon (fluid) algorithm, extended with modality transf. Author: Dirk-Jan Kroon	3d, 2d, fluid, registration, multiple modalities, demon	166	31	4.8 4.8 \| 12 ratings
13 Mar 2009	FMINLBFGS: Fast Limited Memory Optimizer Quasi newton limited memory BFGS and Steepest decent optimizer for large amount of unknowns Author: Dirk-Jan Kroon	bfgs, quasi newton, steepest descent, optimizers, l bfgs, optimization	59	5	4.8 4.8 \| 5 ratings

Comments and Ratings Matching Dirk-Jan's Watch List			1-5 of 133
Date	File	Comment by	Comments	Rating
11 Mar 2010	non-rigid b-spline grid image registration Registration of two 2D/3D images, rigid and with smooth b-spline grid.	medical imaging Ibrahim	I have used this implementation as a step in one of my analysis systems, could you please tell me the paper that I should reference for this work ?	Comment only
15 Feb 2010	multimodality non-rigid demon algorithm image registration non-rigid 2D and 3D image registration with demon (fluid) algorithm, extended with modality transf.	Dirk-Jan Kroon	*Vijay Denoising the data before registration is not really needed, but when done with an edge preserving filter, it will slightly improve the final results.	Comment only
14 Feb 2010	FMINLBFGS: Fast Limited Memory Optimizer Quasi newton limited memory BFGS and Steepest decent optimizer for large amount of unknowns	Tomonori	I encountered an occasion which potentially indicates bug. When the initial parameter sets gives the minimum value of the optimization function, the return values (at least x and fval) of fminlbfgs are empty, which could halt applications utilizing this subfunction. I'm not familiar with the internal process of this subfunction and could not figure out which line needs to be modified, but from the observed input-output relationship, I guess zero repetition results in empty output. If you have references for this optimization methods, would you mind letting us know?	5
13 Feb 2010	multimodality non-rigid demon algorithm image registration non-rigid 2D and 3D image registration with demon (fluid) algorithm, extended with modality transf.	Vijay	This is an excellent algorithm... I have a quick question. Is this algorithm affected by noise in the image? Will it make sense to denoise image before doing image registration? Thanks, VIjay	5
10 Feb 2010	multimodality non-rigid demon algorithm image registration non-rigid 2D and 3D image registration with demon (fluid) algorithm, extended with modality transf.	Toni	Just a quick question please! So the pixel value from the moving image is transformed into the deformed moving one and the new position is e.g. x + Tx(x) , y + Ty(y), right? Does this mean that the old image is just updated with these values? what happens to the old pixel values where the pixel was transformed from and is the 'transformed to' pixel value the new value + the old one which was there already? And where does the interpolation take place? Too much confusion....	Comment only

MATLAB Central Terms of Use

NOTICE: Any content you submit to MATLAB Central, including personal information, is not subject to the protections which may be afforded information collected under other sections of The MathWorks, Inc. Web site. You are entirely responsible for all content that you upload, post, e-mail, transmit or otherwise make available via MATLAB Central. The MathWorks does not control the content posted by visitors to MATLAB Central and, does not guarantee the accuracy, integrity, or quality of such content. Under no circumstances will The MathWorks be liable in any way for any content not authored by The MathWorks, or any loss or damage of any kind incurred as a result of the use of any content posted, e-mailed, transmitted or otherwise made available via MATLAB Central. Read the complete Terms prior to use.