Phase-grouping Lines Extraction Method Based on Edges Detection

The paper presents a new phase-grouping lines extraction method based on edges detection, which improves the traditional phase-grouping lines extraction method greatly. The method can make full use of the gradient orientation information and the magnitude information in the image, so it can extract the objects' straight edges accurately. While the traditional phase-grouping lines extraction method cann't utilize gradient and magnitude information efficiently, so it often extracts lines inaccurately and incorrectly and even produces multi-edges. Using the method presented in this paper, we can overcome such shortcomings and help the task of extracting buildings from large scale urban images.