Based on the analysis of traditional edge detection operator of mathematical morphology

a multi-structuring element edge detection operator of mathematical morphology is proposed

which can suppress noise as much as possible while preserving fine details.Threshold acquired by weighted average of gray levels is used to binarize the image

which has a better effect for improving image edge.Experiment results show that the multi-structuring element edge detection operator of mathematical morphology which suppresses noise effectively can detect the edges from the complex background.