[Insight-users] parameter scaling for registration

[ilker hacıhaliloğlu]

Hi All

 I am working with affine transform image egistration usin mattesmutual
information image metrci. I did read all the email in the mailing list about
tunning the parameters for registration. Especially the ones which explain
parameter scaling.


If I have a 2D image  199*181 pixels and pixel spacing is 0.2084
mm.Whichgives me 42mm*38mm ( this are ultrasound images ). So then my
translationscaling should be
1/(10*sqt(42^2+38^2)=1/550 ? is that correct? If yes what happens if I use
1/1000? I think this will effect my allowed rotation and translations?



 double translationScale = 1.0 / 1000.0;
  if( argc > 8 )
    {
    translationScale = atof( argv[8] );
    }


  // Software Guide : BeginCodeSnippet
  typedef OptimizerType::ScalesType       OptimizerScalesType;
  OptimizerScalesType optimizerScales( transform->GetNumberOfParameters() );



  optimizerScales[0] = 20; ----------------------------------------------->is
this is for scaling? what happenes if I take them 20 instead of 1 . ? Which
was much better for my registration results.
  optimizerScales[1] =  20; --------------------------------------------->  is
this for rotation ?
  optimizerScales[2] =20; ------------------------------------------------->
X coordinate for rotation center?
  optimizerScales[3] = 20; ------------------------------------------------>
Y coordinate of roation center?
  optimizerScales[4] =  translationScale;
  optimizerScales[5] =  translationScale;

In order to scale the parameters of the registration are the optimizerscales
multiplied with them of devided? If this would be a 3D registration then I
should use 12 optimzierscales
What would be the order for them scaling rotation translation?
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