Full 3-D versus rotated 2-D filters

David G. Schieck, Robert R. Stewart

This paper demonstrates that a cylindrically symmetric filter in the 3-D frequency domain gives rise to a cylindrically symmetric operator in the 3-D time domain. We also show that a 2-D vertical slice of this symmetric 3-D time-domain operator is not equivalent to the 2-D operator realized from a vertical panel filter in the frequency domain: That is, the 3-D operator is not a rotated version of the 2-D operator.