Visualization by P-flow: gradient- and feature-based optical flow and vector fields extracted from image analysis.
J Opt Soc Am A Opt Image Sci Vis
; 37(12): 1958-1964, 2020 Dec 01.
Article
em En
| MEDLINE
| ID: mdl-33362139
ABSTRACT
We proposed a method for extracting the optical flow suitable for visualization, pseudo-flow (P-flow), from a natural movie [Exp. Brain Res.237, 3321 (2019)EXBRAP0014-481910.1007/s00221-019-05674-0]. The P-flow algorithm comprises two stages (1) extraction of a local motion vector field from two successive frames and (2) tracking of vectors between two successive frame pairs. In this study, we show that while P-flow takes a feature (vector) tracking approach, it is also classified as a gradient-based approach that satisfies the brightness constancy constraint. We also incorporate interpolation and a corner detector to address the shortcomings associated with the two approaches.
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MEDLINE
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2020
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Article