[Insight-developers] itkMetaDataObject::New

[Blezek, Daniel J (GE, Research)]

Good,  anything you can do to make GDCM / DICOM reading in ITK faster is a Good Thing(tm).
 
-dan

-----Original Message-----
From: insight-developers-bounces+blezek=crd.ge.com at itk.org [mailto:insight-developers-bounces+blezek=crd.ge.com at itk.org]On Behalf Of Jim Miller
Sent: Tuesday, April 04, 2006 12:30 PM
To: insight-developers at itk.org
Subject: [Insight-developers] itkMetaDataObject::New


Mathieu and I are tracking down performance issues reading DICOM.  In my test case of reading 50 images, my test program spends about 25% of its execution time populating the MetaDataDictionary with DICOM tags.  The MetaDataDictionary stores MetaDataObjects which are subclasses of LightObject.  MetaDataObject.h has a standard itkNewMacro() call which requires searching the list of factories for each instantiation of a MetaDataObject.

When I change the MetaDataObject to use an itkFactorylessNewMacro(), I reclaim approximately 20% of the overall process time. 

Does anyone have a use case that requires the items stored in a MetaDataDictionary to use a factor to instantiate a MetaDataObject?

Jim


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