Measuring 3-D plant growth using optical flow

J L Barron, A Liptay
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Abstract

A method is presented for measuring 3-D plant growth using the optical flow computed on an image sequence of a growing corn seedling. Each image in the sequence consists of two views of the same seedling; one view of the corn seedling is front-on while the second view is a orthogonal view (at 90°) of the seedling made by projecting the plant's orthogonal image onto a mirror oriented at 45° with respect to the camera. We compute 3-D velocity (motion) of the corn seedling's tip by using a simple extension of the 2-D motion constraint equation used in optical flow analysis. This method is an extension of the work presented by Barron and Liptay where optical flow was used to measure the 2-D growth (in the vertical plane) of a corn seedling.

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利用光流测量三维植物生长
提出了一种利用玉米幼苗生长图像序列计算光流来测量三维植物生长的方法。序列中的每张图像由同一株幼苗的两个视图组成;玉米幼苗的一个视图是正面的,而第二个视图是幼苗的正交视图(90°),通过将植物的正交图像投射到相对于相机的45°方向的镜子上。本文利用光流分析中二维运动约束方程的简单推广,计算了玉米幼苗尖端的三维速度(运动)。这种方法是Barron和Liptay提出的工作的延伸,他们使用光流来测量玉米幼苗的二维生长(在垂直平面上)。
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