【摘要】 提出了Hough变换的投影观点,从全局的观点来看待(ρ,θ)空间中的所有投票点,研究了直线段在(ρ,θ)空间中对应的一簇正弦曲线.通过对正弦曲线簇,特别是与峰值点偏移π/2相位位置上的研究,提出了π/2线的概念.利用π/2线的性质实现了图像中线段长度及线段是否间断等信息的提取,并构造了一个从(ρ,θ)空间恢复图像线段的算法.研究了通过2个峰值点的一条正弦曲线的特性,得到了图像中多条线段间的相交情况、交点坐标等信息.最后给出利用交点和峰值点直接重建物体轮廓线的算法.更多还原

【Abstract】 An image line segment is transformed by the Hough transform into a set of sinusoidal curves in the(ρ,θ) parameter space.By carefully investigating the positions of π?2 phase deviation from peak points in the parameter space,the π?2-line concept is introduced,by which segment lengths and continuity information in the image space are derived.In addition,an algorithm is proposed to recover the image line segments directly from the(ρ,θ) space.By studying the properties of sinusoids going through two peak points,the information,such as whether segments intersect and their intersecting coordinates,is obtained.Finally,an algorithm of reconstructing object contours by means of peak points and intersecting points is also proposed.更多还原