[vtkusers] Memory from a vtkImageData after a Delete not being freed

[Marcelino Rodriguez Cancio]

Hello everyone:

We are working ITK (with a wrapper written by us and seems to be working fine) + VTK with TCL.

We have a little problem in our application with an reference counting not allowing memory to be freed.

I do as follow:

1. Read an ITK image with our ITK wrapper.
2. Create a vtkImageImport
3. Create a new image
4. Do a shallow copy of the vtkImageImport Output to the new image. (Reference counts "jumps" from 1 to 3 in the new image)
5. Delete the vtkImageImport
6. Delete the new imagen

And the memory is not being freed because of the reference counting > 1.

 I have reproduced the situation in the following snippet of code:

#itktcl is a package developed by ourselves.
package require itktcl

package require vtk

set infile "D:/data/vtks/smoothing.vtk"
puts "reading image file $infile"

#Read the image with our ITK wrapper.
set reader [ Image3DReader ]
$reader SetFileName $infile
$reader Update

set img [ $reader GetOutput ]
$img DisconnectPipeline

#Destroy the reader
rename $reader ""

#Create a itk exporter
set itkExporter [ VTKScalarImageExport ]
$itkExporter SetInput $img

#Import to VTK
set vtkImporter [ vtkImageImport New ]
$itkExporter Connect2VTK $vtkImporter
$vtkImporter Update

#Do a shallow copy
set cpyImg [vtkImageData New]
$cpyImg ShallowCopy [$vtkImporter GetOutput]

#At this point [$cpyImg GetReferenceCount] == 3!!!
puts "cpyImg->RefCount is: [$cpyImg GetReferenceCount]"

#The follwing crashes!!!:
# $cpyImg UnRegister $ vtkImporter

#The follwing also crashes!!!!:
#$vtkImporter UnRegister $cpyImg


#Cleanup
$vtkImporter Delete
#Destroy the itk exporter
$itkExporter SetInput ""
rename $itkExporter ""

#At this point [$cpyImg GetReferenceCount] is ALSO == 3!!!
puts "cpyImg->RefCount Should be 1 but it is: [$cpyImg GetReferenceCount]"

#Memory it's not being freed!!!
$cpyImg Delete

exit


________________________________
Universidad Central "Marta Abreu" de Las Villas. http://www.uclv.edu.cu

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