1 The Gray-Code Filter Kernels Gil Ben-Artzi, Hagit Hel-Or, Member, IEEE, and Yacov Hel-Or, Member, IEEE, Manuscript Submitted September, 2005. G. Ben-Artzi is with the Dept of Computer Science at Bar-Ilan University, Ramat-Gan, Israel. H. Hel-Or is with the Dept of Computer Science at The University of Haifa, Haifa, Israel. Y. Hel-Or is with the School of Computer Science at The Interdisciplinary Center, Herzeliya, Israel. May 14, 2006 DRAFT