When　automatic　patrol　robots　trying　to　identify　road　boundaries　through　edge　detection,　road　marking　lines　on　the　road　may　cause　errors.　In　this　regard,　this　paper　proposes　a　method　to　process　images　base　on　edge　detection　results,　and　builds　a　system　based　on　the　method　for　experiments.　The　experimental　results　show　that　the　proposed　method　can　effectively　reduce　the　edge　features　of　road　markings　lines　while　preserving　the　edge　features　of　real　boundaries,　so　that　robots　can　identify　real　road　boundaries.　©　2019　Association　for　Computing　Machinery.