A time-recursive implementation of threshold Boolean filters
Jaakko T. Astola, David Akopian · IEEE Transactions on Circuits and Systems II Analog and Digital Signal Processing · 1999
A time-recursive architecture for threshold Boolean filters (TBF) is presented. It is based on a certain kind of nearest neighbors calculation which is called "local sorting." This procedure is implemented efficiently in a bit-serial manner. An extension of TBF's, the homogeneous generalized TBF's are defined, They are represented as a linear combination of several homogeneous generalized stack filter outputs and as a threshold Boolean filter on the appended input signal window. The proposed "local sorting" architecture applies to this class of TBF's as well.