Similarity colour morphology

Mathematical morphology was developed for binary images and extended to grey-level images. To date there is no widely accepted extension of mathematical morphology to colour. We present a unifying concept for binary, grey-level and colour morphology introducing similarity measures to form classes of colour morphological operators. We define similarity criteria as the basis for mathematical morphology with flat and non-flat structuring elements. Results for dilation, erosion and hit-or-miss transforms on binary, grey-level and colour images are presented.