【作者】 徐小红； 梁宇劲； 刘厚诚； 朱同林；

【Author】 Xu Xiaohong~(1~2)),Liang Yujing~(1)),Liu Houcheng~(3)),Zhu Tonglin~(1+)) 1(Institution of Agricultural Multimedia Technology SCAU,Guangzhou,510642) 2(College of Science SCAU,Guangzhou 510642) 3(College of horticulture SCAU,Guangzhou 510642)

【机构】 华南农业大学农业多媒体技术研究所； 华南农业大学理学院； 华南农业大学园艺学院；

【摘要】 本文提出了一种不需要定标直接利用哈夫变换计算植物根系在介质不同层次和不同方向根长分布率计算方法。首先基于圆与椭圆是仿射等价图形原理,在线性摄像机模型下,固定在转台上的根系各点在旋转过程中形成的轨迹投影都为椭圆;然后拍摄根系旋转一周的300帧视频,进行二值化和细化,再从视频中等角度提取50帧图片,利用哈夫变换从中检测出根系各点对应椭圆;最后根据椭圆中心坐标计算根系在介质不同层次的分布率,根据椭圆短半轴上端顶点坐标来确定根系在介质不同方向的分布率,从而为进一步研究植物根系生长过程提供一定的理论依据。更多还原

【Abstract】 A new method based on Hough transform to compute the plant roots length distribution rate in different layer and in different direction in growth medium is presented in this paper,which does not require camera calibration.Due to the affine equivalence between circle and ellipse,the projection track of a rotated root point is an ellipse by the linear camera model. Our approach contains three steps:firstly,50 frames are uniformly extracted from the 300 video of the root rotation in one cycle;secondly,after binary transformation and refinement,the ellipses in the frames are detected by Hough transform;at last,the root length distribution in different layers of the growth medium is calculated according to the center coordinates of the ellipses,and the root length distribution in different directions of the growth medium is calculated according to the axis coordinates of the ellipses.Our method can be used as a tool for the studying of the plant root growth process.更多还原