2 EDGE ORIENTATION FOR SECOND DERIVATIVE EDGE DETECTION METHODS

摘要

An improved edge detection algorithm is provided that utilizes a second derivative of the intensity distribution function of the image to provide edge orientation information for the detected edge. An exemplary embodiment of the improved algorithm includes obtaining a second derivative of an intensity distribution function, identifying a zero crossing in the horizontal and vertical directions, assigning angle information to the zero crossing identified in the horizontal and vertical directions, And identifying the edge orientation based on the assigned angle information for the horizontal and vertical zero crossings of the edge and the adjacent edge.;