ITK/Release 4/Enhancing Image Registration Framework/Proposal for Revised Framework/Composite Transform

Overview

• CompositeTransform abstracts a concatenation of transform
  • Deriving from TransformBase (non-templated)
  • Contain a list of pointers to TransformBase
  • Enable the use of mixed dimensionalities ? (e.g. Perspective Transform)

IO

• The TransformFileReader and TransformFileWriter must be modified to manage composite transform.

Writing

• The TransformFileWriter can dynamic_cast to CompositeTransform
  • Then extract its internal transforms

Reading

• The TransformFileReader will create the CompositeTransform directly by using the standard Factories.
• Conditional code will deal with reading the N Transform components.

Changes

• Refactor GetJacobians() to manage sparse matrices OR
  • Make them obsolete and add to the Transforms the method that provide the service of mapping a point through the Jacobian on the transform. In this way they don't have to be represented explicitly.