[Insight-users] WatershedImageFilter Crashed.

[=?GB2312?B?/Yj9iA==?=]

Dear All.

I'm using Watershed filter on my work about segmentation. But it often
crashed and i can not find the reason. Please Help~

Error message is : "list iterator not dereferencable"

Try my best to explain the problem.

This is the part of my program

.....
//A SigmoidImageFilter executed.

typedef  itk::WatershedImageFilter< InternalImageType >
WatershedFilterType; // InternalImageType--> image<float, 2>;
WatershedFilterType::Pointer watershedFilter = WatershedFilterType::New();
watershedFilter->SetInput( sigmoidFilter->GetOutput() );
watershedFilter->SetThreshold( _threshold );
watershedFilter->SetLevel( _level );  //both threshold and  level is
between 0~1
watershedFilter->Update();

When going to this
step: SegmentTreeGenerator<TScalarType>::CompileMergeList(SegmentTableTypePointer
segments,
SegmentTreeTypePointer mergeList)
{
   //.....

   for (segment_ptr = segments->Begin(); segment_ptr != segments->End();
       ++segment_ptr)
    {
    labelFROM = (*segment_ptr).first;

    labelTO
      =
m_MergedSegmentsTable->RecursiveLookup((*segment_ptr).second.edge_list.front().label);

   //.....
}

then I found that the segment_ptr -> hash_table only have one element. Thus
the list crashed.
the variable segment is copy of the input which is defined "  typename
SegmentTableType::Pointer input = this->GetInputSegmentTable(); " in
the SegmentTreeGenerator::GenerateData() part.

I'm not clear about the internal implement of this function. Therefore i
can't find the reason why it crashed.
Please HELP!
THANKS.


-- 
Nothing but a MADAO！
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