A rigid transformation is a geometrical term for the pre-image and the image both having the exact same size and shape.
A rigid transformation means it has the same size and shape so it would be a dilation
Flexing is one such transformation.
isometry
dilation (APEX)
Stretch
A rigid transformation means it has the same size and shape so it would be a dilation
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.
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 .
Flexing is one such transformation.
A transformation is said to be rigid if it preserves relative distances.
isometry
dilation (APEX)
Stretch
Rigid motion
inflating a balloon.
It is called an image.
Itself