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A Sparse Optical Flow Field Calculation Method

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Author(s): Naigong Yu | Xiaogang Ruan | Li Xu

Journal: Transactions on Computer Science and Technology
ISSN 2327-090X

Volume: 2;
Issue: 3;
Start page: 49;
Date: 2013;
Original page

Keywords: Sparse Optical Flow | Shi-Tomasi Corner Detection | LK Algorithm

ABSTRACT
Optical flow depicts the instantaneous velocity of image pixels between successive images and plays an important part in many computer vision tasks. So, the calculation of optical flow = has been the focus of research. However, most optical flow algorithms need to compute velocity at every image points, which is time-consuming and difficult to meet real-time requirements. That greatly hinders the application of optical flow. Furthermore, in some specific tasks, such as motion tracking and mobile robot obstacle avoidance, it is unnecessary to calculate full velocity field. Based on the above mentioned, a sparse optical flow calculation method was proposed in this paper. First of all, Shi-Tomasi corner detection was applied to find corner points with large eigenvalues, then LK optical flow algorithm to calculate optical flow at these points. Experimental results show that not only the running time is greatly reduced but also the accuracy of the optical flow is improved.
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