Abstract: This paper introduces a new approach of improvedCanny operator for edge detection. The filter operator constructed with the first order partial derivative of twodimensional Gaussian function is employed to compute gradient. Then the edge was located via the edge detection and localization method with four threshold values. And finally, edge thin operation was conducted by introducing a morphological operator. The improved algorithm can enhance the capability of suppressing noise, delete false edges and obtain exact edges. Experimental results indicate the feasibility and validity of the improved algorithm.

Key words: Canny operator, edge extraction, image processing