Rank: 11 based on 5916 downloads (last 30 days) and 27 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 27
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
17 Nov 2009	Image Edge Enhancing Coherence Filter Toolbox Advanced 2D/3D noise removal and edge enhancing with anisotropic diffusion filtering ( Weickert ) Author: Dirk-Jan Kroon	ridge, image enhancement, 3d, enhancement, anisotro, weickert	650	6	5.0 5.0 \| 2 ratings
03 Nov 2009	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	mr, fcm, fuzzy cmeans, help, artifacts, light correction	142	3
27 Oct 2009	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	246	14	4.75 4.8 \| 8 ratings
01 Oct 2009	Viewer3D MIP, Color, Slice and Shaded 3D (shearwarp) Volume Rendering, interactive 3D view/measurement GUI Author: Dirk-Jan Kroon	3d, interactive, volume render, shearwarp, image, rays	347	14	4.83333 4.8 \| 6 ratings
01 Oct 2009	Polygon2Voxel Convert a triangulated mesh into a voxel volume Author: Dirk-Jan Kroon	voxel volume, voxels, triangles, polygons, voxel, mesh	141	2	5.0 5.0 \| 2 ratings

Comments and Ratings by Dirk-Jan		View all 1 - 5 of 32
Updated	File	Comments	Rating
09 Nov 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	Dear Hui, (1) Indeed 'p' doesn't exist, I will replace it with 'd' in the next update. (2) The scaling [1 1 1 0.1 0.1] is because the parameters are [translateX translateY rotate resizeX resizeY]. If you change the size of the image only a little bit it will produce large pixel movements. An optimizer produces the best result if all parameters have approximately the same influence on the image transformation, thus we introduced the scaling. Dirk-Jan Kroon
03 Nov 2009	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	*ciaiaia ccccccc The error is very clear it cannot find the file, probably you executed the MEX command from a different folder ? Otherwise try "mex -setup" to reset your compiler settings.
02 Oct 2009	Image Edge Enhancing Coherence Filter Toolbox Advanced 2D/3D noise removal and edge enhancing with anisotropic diffusion filtering ( Weickert ) Author: Dirk-Jan Kroon	I uploaded a new version with derivative boundary check bug fixed, probably tomorrow online. thnx Elmar.
02 Oct 2009	Image Edge Enhancing Coherence Filter Toolbox Advanced 2D/3D noise removal and edge enhancing with anisotropic diffusion filtering ( Weickert ) Author: Dirk-Jan Kroon	*Elmar Thank you for sharing the solution for your NaN problem. Now, I know it's probably caused by a boundary check problem. Dirk-Jan
01 Oct 2009	Image Edge Enhancing Coherence Filter Toolbox Advanced 2D/3D noise removal and edge enhancing with anisotropic diffusion filtering ( Weickert ) Author: Dirk-Jan Kroon	* Elmar, Thank you for your report, I never experienced NaN's my self. Maybe you can add a small value to rule out division by zero. If you still have problems, maybe you can share a part of the volume data with me? Thanx, Dirk-Jan

Comments and Ratings on Dirk-Jan's Files			View all 1 - 5 of 196
Updated	File	Comment by	Comments	Rating
17 Nov 2009	Hessian based Frangi Vesselness filter Enhancement of Vessel/ridge like structures in 2D/3D image using hessian eigen values Author: Dirk-Jan Kroon	Chiu, PX	This seriously looks like great stuff, unfortunately, I can't get the c file to compile.. icc: command line warning #10157: ignoring option '-w'; argument is of wrong type icc: error #10104: unable to open 'all' mex: compile of ' "eig3volume.c"' failed. Any help?? Thx in advance!
11 Nov 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	Li, Chao	Hi Dirk, excellent code. One trivial thing I'd like to report is that: in deciding max refinements steps (e.g., line 255 in 'register_image.m, Version18e'), its better to define the lower bound of MaxItt to account for small images.
09 Nov 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	Kroon, Dirk-Jan	Dear Hui, (1) Indeed 'p' doesn't exist, I will replace it with 'd' in the next update. (2) The scaling [1 1 1 0.1 0.1] is because the parameters are [translateX translateY rotate resizeX resizeY]. If you change the size of the image only a little bit it will produce large pixel movements. An optimizer produces the best result if all parameters have approximately the same influence on the image transformation, thus we introduced the scaling. Dirk-Jan Kroon
06 Nov 2009	Hessian based Frangi Vesselness filter Enhancement of Vessel/ridge like structures in 2D/3D image using hessian eigen values Author: Dirk-Jan Kroon	li	Thank u. It realy helps me a lot!
06 Nov 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	Hui	Hi, Dirk, Thanks for sharing the excellent codes. I have two questions about your version18e codes: 1. In image_difference.m, line 34, if(exist('type','var')==0), type='p'; end. should here type = 'd' as default? Because there is no type 'p' 2. In example_2d_affine.m, can you explain a little bit about why the scale = [1 1 1 0.1 0.1] needed here? I didn't figure out the purpose of scale here. Thanks very much. Hui

Top Tags Applied by Dirk-Jan	1 - 5 of 243
3d, 2d, color, affine, filtering

Files Tagged by Dirk-Jan				View all 1 - 5 of 27
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
17 Nov 2009	Image Edge Enhancing Coherence Filter Toolbox Advanced 2D/3D noise removal and edge enhancing with anisotropic diffusion filtering ( Weickert ) Author: Dirk-Jan Kroon	ridge, image enhancement, 3d, enhancement, anisotro, weickert	650	6	5.0 5.0 \| 2 ratings
03 Nov 2009	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	mr, fcm, fuzzy cmeans, help, artifacts, light correction	142	3
27 Oct 2009	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	246	14	4.75 4.8 \| 8 ratings
01 Oct 2009	Viewer3D MIP, Color, Slice and Shaded 3D (shearwarp) Volume Rendering, interactive 3D view/measurement GUI Author: Dirk-Jan Kroon	3d, interactive, volume render, shearwarp, image, rays	347	14	4.83333 4.8 \| 6 ratings
01 Oct 2009	Polygon2Voxel Convert a triangulated mesh into a voxel volume Author: Dirk-Jan Kroon	voxel volume, voxels, triangles, polygons, voxel, mesh	141	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
01 Oct 2009	Viewer3D MIP, Color, Slice and Shaded 3D (shearwarp) Volume Rendering, interactive 3D view/measurement GUI Author: Dirk-Jan Kroon	3d, interactive, volume render, shearwarp, image, rays	347	14	4.83333 4.8 \| 6 ratings
01 Oct 2009	Polygon2Voxel Convert a triangulated mesh into a voxel volume Author: Dirk-Jan Kroon	voxel volume, voxels, triangles, polygons, voxel, mesh	141	2	5.0 5.0 \| 2 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	2d, 3d, fluid, registration, multiple modalities, demon	254	21	4.66667 4.7 \| 7 ratings
30 Sep 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	registration, 2d, nonrigid, bspline, 3d, c mex	333	68	4.75 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	208	4	4.66667 4.7 \| 3 ratings

Comments and Ratings Matching Dirk-Jan's Watch List			1-5 of 110
Date	File	Comment by	Comments	Rating
11 Nov 2009	non-rigid b-spline grid image registration Registration of two 2D/3D images, rigid and with smooth b-spline grid.	Chao Li	Hi Dirk, excellent code. One trivial thing I'd like to report is that: in deciding max refinements steps (e.g., line 255 in 'register_image.m, Version18e'), its better to define the lower bound of MaxItt to account for small images.	Comment only
09 Nov 2009	non-rigid b-spline grid image registration Registration of two 2D/3D images, rigid and with smooth b-spline grid.	Dirk-Jan Kroon	Dear Hui, (1) Indeed 'p' doesn't exist, I will replace it with 'd' in the next update. (2) The scaling [1 1 1 0.1 0.1] is because the parameters are [translateX translateY rotate resizeX resizeY]. If you change the size of the image only a little bit it will produce large pixel movements. An optimizer produces the best result if all parameters have approximately the same influence on the image transformation, thus we introduced the scaling. Dirk-Jan Kroon	Comment only
06 Nov 2009	non-rigid b-spline grid image registration Registration of two 2D/3D images, rigid and with smooth b-spline grid.	Hui	Hi, Dirk, Thanks for sharing the excellent codes. I have two questions about your version18e codes: 1. In image_difference.m, line 34, if(exist('type','var')==0), type='p'; end. should here type = 'd' as default? Because there is no type 'p' 2. In example_2d_affine.m, can you explain a little bit about why the scale = [1 1 1 0.1 0.1] needed here? I didn't figure out the purpose of scale here. Thanks very much. Hui	Comment only
21 Oct 2009	Viewer3D MIP, Color, Slice and Shaded 3D (shearwarp) Volume Rendering, interactive 3D view/measurement GUI	Ted Teng	excellent work. thanks for sharing!	5
06 Oct 2009	non-rigid b-spline grid image registration Registration of two 2D/3D images, rigid and with smooth b-spline grid.	Xi Liang	Dear Dirk, The volume I want to show is very noisy, and by using the function of "showcs3", the images appear to be much less noisy. I assume there are certain kind of filter used. Would you please roughly point out where it is in the code?	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.