Author: Gong, Chenhui
Title: Action recognition : improvements for spatio-temporal laplacian pyramid coding
Advisors: Lam, Kin Man (EIE)
Degree: M.Sc.
Year: 2019
Subject: Hong Kong Polytechnic University -- Dissertations
Computer vision
Pattern recognition systems
Image processing -- Digital techniques
Department: Faculty of Engineering
Pages: vi, 66 pages : color illustrations
Language: English
Abstract: In computer vision research, human action analysis in videos has attracted more and more attention. Many recognition algorithms have been reported recently. This dissertation focuses on a study of the holistic representation: spatio-temporal Laplacian pyramid coding (STLPC), and improves its shortcomings. Compared with sparse representation which detects local interest points, this method can encode more visual information. STLPC considers a video sequence as a 3-D volume, which is called a video volume, and the spatio-temporal features are extracted from it. Through the establishment of pyramid model and the use of 3-D Gabor filters, the information which comes from different scales and orientations is obtained. The max pooling method is then applied to preserve useful information. STLPC can generate a representation with action information and the structure is also included. However, holistic representations also have some shortcomings. They are sensitive to occlusions and background variations. These problems can be overcome and the final result can be improved through a background subtraction method, which is called ViBe+, to segment out human body from a video sequence. ViBe+ is a pixel-level model. It can be used to extract background and detect foreground. This segmentation method is better than several well-known algorithms. The proposed method is evaluated on the KTH and UCF datasets. Experiment results show that the recognition rates of the proposed method are better than many other methods.
Rights: All rights reserved
Access: restricted access

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