Research on improved Canny algorithm based on thinning operator of mathematical morphology

Edge detection is an important part in the field of image processing.In this paper,a new edge detection method was put forward by improving the Canny operator based on mathematical morphology.The method filtered the image by Canny operator,and then nonmaxima suppression technology was applied for fitting the edges of strong edge image and weak edge image together.Finally,thinning operator of mathematical morphology was introduced to thin the edge of result image.Different effects on edge detection could be achieved by different images using corresponding threshold ratios.With three evaluation indexes such as PSNR,MSE,MAE,the results showed that proposed approach was obviously superior to Sobel operator,Roberts operator,Log operator and Canny operator.