为了能有效解决H ough 变换的计算量大的问题，文中提出了一种基于直线局部结构特征的H ough 变换改进的直

线检测算法。该算法根据F reem an 准则分析了直线上基元的特征信息，通过图像上邻近的同类基元的倾斜角约束基元上

像素点的极角范围，减少每个点的计算次数，在保持精度的同时，提高直线检测的速度，在有噪声的情况下，该算法相对标

准H ough 变换算法可以提高到6 到7 倍。

-In o rder to effectively solve the pro blem of decreasing com putation in the process of using H ough T ransform (w r ) to extract

str aigh t line ．an im p ro v ed H T algo ri th m m etho d is p res en ted b ased O n-th e loc al ch aracteri stics o f the straig h t lin e ．A cc ord ing to F ree m a n

C ri te ria ，th e im p rov ed m eth o d an a lyzes e lem en tary line seg m e n ts s tru ctu re o f th e stra ig h t lin e ，an d d efine s th e sco p e of t3o lar an g le o f th e

points on elem entary line segm ents by com putin g the tilt ang le of the straight line d eterm ined by the tw o adjacent an d cong eneri c elem en —

tary sin e seg m en ts ，an d th en d ec rea se s th e c om p uting tim es o f ev ery po in t ．P o in ting to th e im a g e co n tain ing n o ise ，th e tes ting da ta sh o w s

th a t v elo c ity o f th e im p ro v ed a lg o rithm is 6- 7 tim es as fas t aS th e stan d ~ d o n e ，w h ile th e prec ision is k e p t．