When line edges are linked with gradient phase and location information

linking result is easily affected by noise

which produces broken line segments. To improve the robustness of line extraction to noise

adaptive phase partitioning principle and location constraint principle for edge linking are proposed through analyzing the statistical characteristic of gradient phase and location of line edge. Based on above principles

a novel line extraction method is proposed. Firstly

the Canny method is used to detect edges. Secondly

short lines are extracted and used to estimate parameters for line linking. Finally

line edges are linked using “phase principle” and “position principle” alternatively. Experimental results show that the proposed method extracts lines completely and precisely.