[Rtk-users] Input and output image buffer

[louie L]

Dear RTK users and developers,

I am writing a backprojection filter whose superclass is ImageToImageFilter. After allocating the output, I called 
this->GetInput()->GetBufferPointer() and 
this->GetOutput()->GetBufferPointer().
to get the address of the images in memory. However the two functions above return the same value. Why? If this is not the correct way to get the address of the input image, how can I get that address?
Thank you.

Best regards,
Louie