@TechReport{buelowTR9903, author = {T. B{"u}low}, title = {Hypercomplex Spectral Signal Representations for the Processing and Analysis of Images}, institution = {Christian-Albrechts-Universit{"a}t zu Kiel, Institut f{"u}r Informatik und Praktische Mathematik}, type = {Technical Report}, number = {Number 9903}, month = {August}, year = 1999, }