Author: Li, Junxian
Title: Accumulated effective optical flow feature for micro-expression recognition
Degree: M.Sc.
Year: 2019
Subject: Hong Kong Polytechnic University -- Dissertations
Human face recognition (Computer science)
Image analysis -- Data processing
Image processing -- Digital techniques
Department: Faculty of Engineering
Pages: iv, 33 pages : color illustrations
Language: English
Abstract: Micro-expressions are very brief facial expressions which have short duration, and low intensity and arise at small, partial and irregular region of a face. Compared to the basic facial expression recognition, micro-expression is more complex and harder to be detected and recognized by human's eyes and computer-vision methods. This dissertation proposes an Accumulated Effective Optical flow (AEOF) feature for micro-expression recognition. Firstly, the integrated optical flow fields between every two adjacent frames are computed. Then, 68 facial landmarks of a face subject in a video sequence are detected and located. Based on the landmarks, eleven regions of interest (ROIs) are partitioned according to the Facial Action Coding System (FACS). At the same time, the onset frames and apex frames of all micro-expression video samples are spotted, based on the mean optical-flow magnitude (MOFM) feature in the eleven ROIs. Next, the AEOF features, which have a dimension of 11×8=88, are extracted from onset frame to apex frame. Finally, Support Vector Machine (SVM) classifiers with the AEOF features are applied for micro-expression recognition. Evaluating on the spontaneous micro-expression database CASME II, experiment results show the AEOF can recognize micro-expressions accurately, and achieve an improvement in comparison with an optical-flow baseline feature, called Histogram of Optical-Flow (HOOF), and a state-of-the-art method, Main Directional Mean Optical-Flow (MDMO).
Access: restricted access

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