Patent ID: 8594436
Filing Date: 2013-11-26
Classification: G06K

Abstract:
1. A method for detecting an edge of a fixed pattern, comprising: receiving a current input image; receiving a history image and a corresponding history edge information; adding the current input image and the history image according to a weight ratio to obtain a current analyzing image; calculating an edge strength value of each pixel of the current analyzing image, wherein the edge strength value is calculated based on a predetermined condition of edge characteristic, and when the edge strength value is greater than a predetermined value, the pixel is a possible edge pixel, the current analyzing image is taken as the history image for next edge detection and analysis, and the edge pixel and the edge strength are recorded in the history edge information; calculating a consistent pixel number that meets a predetermined consistent condition and an inconsistent pixel number that meets a predetermined inconsistent condition for the edge pixel of the current analyzing image and the edge pixel of the history image; and when the consistent pixel number is greater than a first predetermined value and meanwhile the inconsistent pixel number is less than a second predetermined value, detecting the current input image having a fixed pattern with a fixed edge.