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ThinkMind // MMEDIA 2013, The Fifth International Conferences on Advances in Multimedia // View article mmedia_2013_4_30_40045


Video Object Detection by Classification Using String Kernels

Authors:
Wan-Hsuan Yu
Chi-Han Chuang
Shyi-Chyi Cheng

Keywords: video objects; string kernels; dynamic programming; video object modeling; SVM classification

Abstract:
Video object detection is one of the most important research problems for video event detection, indexing, and retrieval. For a variety of applications such as video surveillance and event annotation, the spatial-temporal boundaries between video objects are required for annotating visual content with high-level semantics. In this paper, we define spatial-temporal sampling as a unified process of extracting video objects and computing their spatial-temporal boundaries using a learnt video object model. We first provide a learning approach to build a class-specific video object model from a set of training video clips. Then the learnt model is used to locate the video objects with precise spatial-temporal boundaries from a test video clip using graph kernels. A frame sorting process as a preprocessing is also proposed to transform the graph, modeling the shot configuration of a video clip, into a string of shots. Thus, the computation of graph kernels is simplified to be string kernels. The string kernels for support vector machine (SVM) classification are finally adopted to train the SVM classifiers from a set of training samples and detect the video objects in a test video clip by classification. A human action detection and recognition system is finally constructed to verify the performance of the proposed method. Experimental results show that the proposed method gives good performance on several publicly available datasets in terms of detection accuracy and recognition rate.

Pages: 82 to 87

Copyright: Copyright (c) IARIA, 2013

Publication date: April 21, 2013

Published in: conference

ISSN: 2308-4448

ISBN: 978-1-61208-265-3

Location: Venice, Italy

Dates: from April 21, 2013 to April 26, 2013

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