arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2204.03331cs.CV
收藏

基于稀疏光流的直线特征跟踪

Sparse Optical Flow-Based Line Feature Tracking

Hunan University(湖南大学);University of Alberta(阿尔伯塔大学)

Qiang Fu, Hongshan Yu, Islam Ali, Hong Zhang

摘要:

本文提出了一种基于稀疏光流(SOF)的线特征跟踪方法来解决摄像机姿态估计问题。该方法受基于点的SOF算法的启发,基于时变图像序列中相邻两幅图像满足亮度不变性的观察而发展。在此基础上,我们重新定义了线特征跟踪的目标:基于灰度值匹配而不是描述符匹配跟踪线特征的两个端点而不是整条线。为了实现这一目标,提出了一种有效的两端点跟踪方法:首先,用两个端点描述给定的线特征;然后,基于SOF跟踪这两个端点,通过最小化像素级灰度残差函数得到两个新的被跟踪端点;最后,连接这两个被跟踪端点生成一个新的线特征。在给定的线特征和新的线特征之间建立对应关系。与现有的基于特征提取的方法相比,本文提出的TET方法不需要重复计算描述子和检测线特征。当然,它比计算有明显的优势。在几个公共基准数据集上的实验表明,该方法具有很高的准确性,在速度上具有明显的优势。

英文摘要:

In this paper we propose a novel sparse optical flow (SOF)-based line feature tracking method for the camera pose estimation problem. This method is inspired by the point-based SOF algorithm and developed based on an observation that two adjacent images in time-varying image sequences satisfy brightness invariant. Based on this observation, we re-define the goal of line feature tracking: track two endpoints of a line feature instead of the entire line based on gray value matching instead of descriptor matching. To achieve this goal, an efficient two endpoint tracking (TET) method is presented: first, describe a given line feature with its two endpoints; next, track the two endpoints based on SOF to obtain two new tracked endpoints by minimizing a pixel-level grayscale residual function; finally, connect the two tracked endpoints to generate a new line feature. The correspondence is established between the given and the new line feature. Compared with current descriptor-based methods, our TET method needs not to compute descriptors and detect line features repeatedly. Naturally, it has an obvious advantage over computation. Experiments in several public benchmark datasets show our method yields highly competitive accuracy with an obvious advantage over speed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑