[PDF][PDF] A study of feature extraction algorithms for optical flow tracking

N Nourani-Vatani, PVK Borges… - … Conference on Robotics …, 2012 - researchgate.net
Australasian Conference on Robotics and Automation, 2012researchgate.net
Sparse optical flow algorithms, such as the Lucas-Kanade approach, provide more
robustness to noise than dense optical flow algorithms and are the preferred approach in
many scenarios. Sparse optical flow algorithms estimate the displacement for a selected
number of pixels in the image. These pixels can be chosen randomly. However, pixels in
regions with more variance between the neighbors will produce more reliable displacement
estimates. The selected pixel locations should therefore be chosen wisely. In this study, the …
Abstract
Sparse optical flow algorithms, such as the Lucas-Kanade approach, provide more robustness to noise than dense optical flow algorithms and are the preferred approach in many scenarios. Sparse optical flow algorithms estimate the displacement for a selected number of pixels in the image. These pixels can be chosen randomly. However, pixels in regions with more variance between the neighbors will produce more reliable displacement estimates. The selected pixel locations should therefore be chosen wisely. In this study, the suitability of Harris corners, Shi-Tomasi’s “Good features to track”, SIFT and SURF interest point extractors, Canny edges, and random pixel selection for the purpose of frame-by-frame tracking using a pyramidical Lucas-Kanade algorithm is investigated. The evaluation considers the important factors of processing time, feature count, and feature trackability in indoor and outdoor scenarios using ground vehicles and unmanned areal vehicles, and for the purpose of visual odometry estimation.
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