What are your objects like. Are they connected to each other or disjoint? If they are disjoint, you can get away with a single levelset function. <br><br>Are there image features like image gradients that characterize the object boundaries. If so, you can use the GeodesicActiveContoursLevelSetImageFilter. Assuming the objects are connected, you can instantiate it inside the for loop and run it n times, each time giving you a different object. In each iteration, you will need to initialize a levelset function inside the n different objects successively.<br>
<br>The usage of the class is given as an example in the ITKSoftwareGuide. There are many other levelset classes too.<br><br>Kishore<br><br><div class="gmail_quote">On Tue, Sep 22, 2009 at 5:51 PM, Aditya Gupta <span dir="ltr"><<a href="mailto:adityargupta@gmail.com">adityargupta@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hey Kishore,<br><br>Thank you so much for your help. I derived a class from the itkSegmentationLevelSetImageFilter and now I'm not getting any errors. But I'm still stuck with a method to call LevelSet n times for a image where n would be the number of objects I need to segment using level set. Like from my code I want to give something like LevelSet->Start() and have a LevelSet->Run() within a for loop which iterates n times. Any help will be appreciated.<br>
<br>Thank you.<br><br>Regards,<br><font color="#888888">Aditya Gupta</font><div><div></div><div class="h5"><br><br><div class="gmail_quote">On Mon, Sep 21, 2009 at 9:20 PM, Kishore Mosaliganti <span dir="ltr"><<a href="mailto:kishoreraom@gmail.com" target="_blank">kishoreraom@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi Gupt,<br><br>You cannot instantiate that filter in your code and several virtual functions are pure in this class. This class will have to be derived before instantiation.<br>
<br>Since you are looking for level-set methods already implemented, you can look at classes inheriting from <span>itkSegmentationLevelSetImageFilter</span>. This can be seen in the very wide figure in:<br>
<a href="http://www.itk.org/Doxygen314/html/classitk_1_1SegmentationLevelSetImageFilter.html" target="_blank">http://www.itk.org/Doxygen314/html/classitk_1_1SegmentationLevelSetImageFilter.html</a><br><br><br>Kishore<br>
<br><br><br><div class="gmail_quote"><div><div></div><div>
On Mon, Sep 21, 2009 at 11:48 PM, Aditya Gupta <span dir="ltr"><<a href="mailto:adityargupta@gmail.com" target="_blank">adityargupta@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><div></div><div>
<div><span>Hello,
</span><br><br><span>I'm using Level Set Segmentation for my project <b>and</b> <b>am</b> trying <b>to</b> develop my own speed function. I've included the file itkSegmentationLevelSetImageFilter.h <b>and</b> then was <b>adding</b> some functions <b>to</b> this file <b>and</b> I realized that with the original header file I'm getting errors. Below is <b>a</b> very simple program where I'm creating <b>an</b> instance of <b>a</b> pointer <b>to</b> this filter <b>and</b> I'm getting the error that follows the program. I've tried changing data types but I'm unable <b>to</b> get rid of this error. Please help... Thank you.
</span><br><br><span>#include "itkImage.h"
</span><br><span>#include "itkImageFileReader.h"
</span><br><span>#include "itkImageFileWriter.h"
</span><br><span>#include "itkSegmentationLevelSetImageFilter.h"
</span><br><br><span>int main( int <b>argc</b>, char *<b>argv</b>[] )
</span><br><span>{
</span><br><span> typedef float InternalPixelType;
</span><br><span> const unsigned int Dimension = 2;
</span><br><span> typedef itk::Image< InternalPixelType, Dimension > InternalImageType;
</span><br><span>
</span><br><span> typedef itk::SegmentationLevelSetImageFilter<InternalImageType, InternalImageType> SLSfilter;
</span><br><span>
</span><br><span>// <b>ACTUAL</b> LEVEL SET starts
</span><br><br><span> SLSfilter::Pointer multipleLevelSet = SLSfilter::New();
</span><br><span>
</span><br><span> return 0;
</span><br><span>}
</span><br><br><span>ERROR:
</span><br><span>1>------ Build started: Project: cellSegmentation, Configuration: Debug Win32 ------
</span><br><span>1>Compiling...
</span><br><span>1>cellSegmentation.cxx
</span><br><span>1>.\cellSegmentation.cxx(32) : error C2440: 'initializing' : cannot convert from 'itk::SmartPointer<<b>TObjectType</b>>' <b>to</b> 'itk::SmartPointer<<b>TObjectType</b>>'
</span><br><span>1> with
</span><br><span>1> [
</span><br><span>1> <b>TObjectType</b>=itk::SparseFieldLevelSetImageFilter<InternalImageType, itk::Image<InternalPixelType,2>>
</span><br><span>1> ]
</span><br><span>1> <b>and</b>
</span><br><span>1> [
</span><br><span>1> <b>TObjectType</b>=itk::SegmentationLevelSetImageFilter<InternalImageType,InternalImageType>
</span><br><span>1> ]
</span><br><span>1> No constructor could take the source type, or constructor overload resolution was <b>ambiguous</b>
</span><br><span>1>Build log was saved <b>at</b> "file://c:\Documents <b>and</b> Settings\USER\My Documents\Visual Studio 2008\Projects\CellSegm01\cellSegmentation.dir\Debug\BuildLog.htm"
</span><br><span>1>cellSegmentation - 1 error(s), 0 warning(s)
</span><br><span>2>------ Skipped Build: Project: <b>ALL_BUILD</b>, Configuration: Debug Win32 ------
</span><br><br><br><br><span>Originally I had <b>a</b> longer program with the speed function <b>and</b> I was landing into the error below. Then I reduced the program <b>to</b> the very basic (<b>above</b>) <b>and</b> still I get the error.
</span><br><br><span>1>------ Build started: Project: cellSegmentation, Configuration: Debug Win32 ------
</span><br><span>1>Compiling...
</span><br><span>1>cellSegmentation.cxx
</span><br><span>1>c:\documents <b>and</b>
settings\user\my documents\visual studio
2008\projects\cellsegm01\itkSNAPLevelSetFunction.txx(347) : error
C2664:
'itk::VectorLinearInterpolateImageFunction<TInputImage,TCoordRep>::EvaluateAtContinuousIndex'
: cannot convert parameter 1 from
'itk::ContinuousIndex<TCoordRep,VIndexDimension>' <b>to</b> 'const itk::ContinuousIndex<TCoordRep,VIndexDimension> &'
</span><br><span>1> with
</span><br><span>1> [
</span><br><span>1> TInputImage=itk::Image<itk::FixedArray<float,2>,2>,
</span><br><span>1> TCoordRep=float
</span><br><span>1> ]
</span><br><span>1> <b>and</b>
</span><br><span>1> [
</span><br><span>1> TCoordRep=double,
</span><br><span>1> VIndexDimension=2
</span><br><span>1> ]
</span><br><span>1> <b>and</b>
</span><br><span>1> [
</span><br><span>1> TCoordRep=float,
</span><br><span>1> VIndexDimension=2
</span><br><span>1> ]
</span><br><span>1> Reason: cannot convert from 'itk::ContinuousIndex<TCoordRep,VIndexDimension>' <b>to</b> 'const itk::ContinuousIndex<TCoordRep,VIndexDimension>'
</span><br><span>1> with
</span><br><span>1> [
</span><br><span>1> TCoordRep=double,
</span><br><span>1> VIndexDimension=2
</span><br><span>1> ]
</span><br><span>1> <b>and</b>
</span><br><span>1> [
</span><br><span>1> TCoordRep=float,
</span><br><span>1> VIndexDimension=2
</span><br><span>1> ]
</span><br><span>1> No user-defined-conversion operator <b>available</b> that can perform this conversion, or the operator cannot be called
</span><br><br><br><span>Thank you for your help...
</span><br><br><span>Gupt</span></div>
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