The key to edge detection is to filter more noises while obtaining more edge details. A new multi-scale morphological method of edge detection based on contour structuring elements is proposed in this paper. This method realizes a modified morphological transform through regrouping the priorities of several morphological transforms based on contour structuring elements firstly. And then a new edge detector is defined by using the multi-scale operation of the modified morphological transform. Comparative study with other morphological methods reveals its superiority over de-noising capacity

edge detail protection and un-sensitivity to the shape of the structuring elements.