Hi When you use two or more wavelet for processing the image its called as Mutiwavelet transformation.Matlab Package for these transformation are available.Dr.Vasily Strela has created the package for it.Google for his name ,You can mail him to get the package.I think its has Matlab 4/5 version compatibility,not very sure of it. If you have any other questions..mail me at rrromeoranjan@gmail.com
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rigid transformation is for same modality(CT-CT) nad it can only perform translation, rotation and scaling translation. whereas non rigid for multimodality and it can do streching and shriking too. it use demon algorithm .
A rigid transformation is when a shape is moved with no changes to its shape whereas a size transformation is when a shape is moved with its shape becoming smaller or larger.
A figure resulting from a transformation is called an IMAGE
explain formula transformation
The answer depends on the nature of the transformation.