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0006156

ITK

public

2007-12-13 03:54

2010-10-21 12:32

Reporter

lucantiga

Assigned To

lucantiga

Priority

normal

Severity

feature

Reproducibility

always

Status

closed

Resolution

fixed

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Target Version

Fixed in Version

Summary

0006156: Level sets filters should be extended to anisotropic spacings. Right now, concept checking should be added.

Description

The level sets framework, and in general any class derived from itk::SparseFieldLevelSetImageFilter, assumes spacing is isotropic.
The difficulty resides:
1) in the way the mutual location of the tracked zero-level set and the active layer in the sparse field is computed
2) in how upwind and centered gradients are computed internally (and in methods of related classes, like itk::SegmentationLevelSetFunction::AdvectionField)
This limitation should be removed, taking particular care at how layers in the sparse field are handled.

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Notes
(0009866) lucantiga (developer) 2007-12-13 04:00	Please ignore the second part of the subject (concept checking should be added), as I inadvertently submitted the bug before I was done with it. I meant "add more control on isotropic spacing", but it clearly can't be done compile-time.

(0010194) Luis Ibanez (manager) 2008-01-18 13:31	1) Document this behavior 2) In order to fix it we will have to add a run-time flag so that backward compatibility is ensured. 3) Concept checking can't help here, since spacing is only known at run-time

(0010202) Luis Ibanez (manager) 2008-01-21 08:48	Luca volunteered to fix this problem.

(0010692) lucantiga (developer) 2008-03-03 09:03	The issue has been fixed. Support for isotropic and anisotropic image spacings has been added to all level sets functions and filters, including serial and parallel sparse field level sets and CurvatureFlowFunction. The new functionality can be activated with UseImageSpacingOn. A fudge factor used for surface interpolation in SparseFieldLevelSetImageFilter has been removed. The baseline image for VectorThresholdSegmentationLevelSetImageFilterTest has been replaced, as the baseline result was influenced by the fudge factor.

Issue History
Date Modified	Username	Field	Change
2007-12-13 03:54	lucantiga	New Issue
2007-12-13 04:00	lucantiga	Note Added: 0009866
2008-01-18 13:31	Luis Ibanez	Note Added: 0010194
2008-01-21 08:48	Luis Ibanez	Note Added: 0010202
2008-01-21 09:56	Luis Ibanez	Status	new => assigned
2008-01-21 09:56	Luis Ibanez	Assigned To	=> lucantiga
2008-03-03 09:03	lucantiga	Note Added: 0010692
2008-03-03 09:03	lucantiga	Status	assigned => resolved
2008-03-03 09:03	lucantiga	Resolution	open => fixed
2010-10-21 12:32	Gabe Hart	Status	resolved => closed