[Insight-users] ShapePriorMAPCostFunction and GeodesicActiveContourShapePriorLevelSetImageFilter

[Lucas Lorenzo]

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Hi all,

I'm using ShapePriorMAPCostFunction and  
GeodesicActiveContourShapePriorLevelSetImageFilter based on the test  
ITK/Testing/Code/Algorithms/ 
itkGeodesicActiveContourShapePriorLevelSetImageFilterTest_2.cxx
So, I have three questions:

1) when using ShapePriorMAPCostFunction what do SetShapeParameterMeans  
and SetShapeParameterStandardDeviations represent. In my case I'm  
working with 5 principal components so my understanding is that each of  
the arrays passed to both of these methods will be of length 5, but I  
can't understand where should I get these values from.

2) In the test file mentioned before an object (called filter) of class  
GeodesicActiveContourShapePriorLevelSetImageFilter is defined. At a  
certain point an array (called parameters) of type ParametersType is  
defined and then the following member function is called

	filter->SetInitialParameters( parameters );

I couldn't find the SetInitialParameters member function within the  
list of all members of  
GeodesicActiveContourShapePriorLevelSetImageFilter. So my doubt is what  
should be loaded into parameters ?

3) Finally, the following is done:

	  // Set up a translation transform
   	//
   	typedef itk::TranslationTransform<double,ImageDimension>  
TransformType;
   	TransformType::Pointer transform = TransformType::New();

and then the transform is passed to the object shape of class  
PCAShapeSignedDistanceFunction

   shape->SetTransform( transform );

What is this transform used for ?

Sorry for asking all these questions. I feel that most of them have  
more to do with the algorithm being implemented rather than ITK itself  
but when reading the reference paper many of these details are missing.
Cheers,


Lucas Lorenzo

University of Utah
Nora Eccles Harrison CardioVascular Research and Training Institute
Fellows Room
95 South 2000 East
Salt Lake City, UT 84112-5000

e-mail:  lucas at cvrti.utah.edu

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Hi all,


I'm using ShapePriorMAPCostFunction and
GeodesicActiveContourShapePriorLevelSetImageFilter based on the test
ITK/Testing/Code/Algorithms/itkGeodesicActiveContourShapePriorLevelSetImageFilterTest_2.cxx

So, I have three questions:


1) when using ShapePriorMAPCostFunction what do SetShapeParameterMeans
and
<color><param>0000,0000,0000</param>SetShapeParameterStandardDeviations</color>
represent. In my case I'm working with 5 principal components so my
understanding is that each of the arrays passed to both of these
methods will be of length 5, but I can't understand where should I get
these values from.


2) In the test file mentioned before an object (called filter) of
class GeodesicActiveContourShapePriorLevelSetImageFilter is defined.
At a certain point an array (called parameters) of type ParametersType
is defined and then the following member function is called


	filter->SetInitialParameters( parameters );


I couldn't find the SetInitialParameters member function within the
list of all members of
GeodesicActiveContourShapePriorLevelSetImageFilter. So my doubt is
what should be loaded into parameters ?


3) Finally, the following is done:


	  // Set up a translation transform

  	//

  	typedef itk::TranslationTransform<<double,ImageDimension>
TransformType;

  	TransformType::Pointer transform = TransformType::New();

 

and then the transform is passed to the object shape of class
PCAShapeSignedDistanceFunction


  shape->SetTransform( transform );


What is this transform used for ?


Sorry for asking all these questions. I feel that most of them have
more to do with the algorithm being implemented rather than ITK itself
but when reading the reference paper many of these details are missing.

Cheers,



Lucas Lorenzo


University of Utah

Nora Eccles Harrison CardioVascular Research and Training Institute

Fellows Room

95 South 2000 East

Salt Lake City, UT 84112-5000


e-mail:  lucas at cvrti.utah.edu


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