Colour-sensitive edge detection using hypercomplex filters
Carolyn J. Evans, Stephen J. Sangwine, Todd A. Ell · European Signal Processing Conference · 2000
Colour edge detection procedures usually aim to find significant discontinuities between all adjacent homogeneous image regions, no matter what the colour. In this paper we present a colour edge detection procedure designed to find edges between homogeneous regions of particular colours. Initially the three-dimensional RGB colour space is modelled as the imaginary subspace of a four-dimensional, hypercomplex space. A hypercomplex filter is then used to highlight edges between a region of colour C 1 to a region of colour C 2 . A 4-D, thresholding criterion is derived to identify the image pixels belonging to these edges. We demonstrate that this procedure can successfully find particular coloured edges in both synthetic and natural images.