Realization of a recursive 3-D cone filter for video processing applications

In this paper a realization of a recursive 3-D cone filter applicable for low cost hardware like FPGAs, for instance, is presented. Based on the filter design method proposed by Bolle, multidimensional wave digital filters are used to approximate a cone-shaped frequency response. Focus is not set on filter design but on filter implementation and problems arising in that context. In detail, the impact of signal size, chosen processing scheme and shift operators on hardware implementation is illuminated and a suitable solution is proposed. For verification, an example of a filtered video sequence showing moving objects is given.