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. 2018 Mar 8;9(3):118. doi: 10.3390/mi9030118

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Evaluation of optical flow algorithm based Baker’s test template. (a) The rotation amplitude of the ball in different image sequences. In the legend, ‘Time = n’ represents how many times the rotation amplitude of the image sequence is that between two adjacent images, and n is the difference between the frame numbers; and (b) the comparison between the ground truth and the calculated rotation velocity on different testing sequences. The calculated rotation velocity is the average value of the same sequence.