[Insight-users] RecursiveGaussianImageFilter

[Mathieu Malaterre]

Luis Ibanez wrote:
> 
> Hi Silvano,
> 
> You are right, the results of the derivative shouldn't
> change when you add a constant value to the input image.

Except if you are overflow. Are you working on char / unsigned char 
image ? Then you have great chance to be overflow even if you only add a 
small constant. BTW if you are unsigned don't add any negative value or 
check first the scalar range (=min/max) of your image.


Mathieu