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       Image (c) is obtained by a rigid transformation (translation).  | 
  
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       Image (c) is obtained by a rigid transformation (rotation).  | 
  
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       Image (c) is obtained by an affin transformation (dilatation).  | 
  
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       Image (c) is obtained by an affin transformation.  | 
  
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       Image (c) is transformed by an affin transformation.  |