由于利用边缘的梯度相位和位置提取直线容易受到噪声干扰，从而导致直线断裂。为了增强直线提取算法的抗噪性能，首先通过定量分析直线边缘梯度相位和位置分布的统计特性，建立了边缘连接的自适应相位分区和位置约束准则；然后基于两类新准则，提出了一种直线提取新方法。该方法首先采用Canny算子检测边缘；然后初步连接短直线，并估计边缘连接的约束准则参数；最后通过“相位准则连接”与“位置准则连接”模式并行交互执行来提取直线。实验结果表明，该方法提取的直线完整、断裂少、准确度高。

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.