[Insight-users] Speed Image for Level Set Filters

[neha k]

Hello,

For Shape Detection Level Set Filter and other Level Set filters, speed image is obtained from Gradient Magnitude.  Then the speed is calculated from Speed Image which is obtained from Sigmoid filter.  How is speed calculated from it?  It looks like output of sigmoid is obtained by inverting gradient magnitude ouput. Is it possible to use gradient magnitude output as a speed image? I am not clear on real advantages and purpose of using sigmoid filter.   Any input of this is appreciated. 

Thanks, 

Neha

 

 

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