EventNet: A Large Scale Structured Concept Library for Complex Event Detection in Video

Event-specific concepts are the semantic concepts specifically designed for the events of interest, which can be used as a mid-level representation of complex events in videos. Existing methods only focus on defining event-specific concepts for a small number of pre-defined events, but cannot handle novel unseen events. This motivates us to build a large scale event-specific concept library that covers as many real-world events and their concepts as possible. Specifically, we choose WikiHow, an online forum containing a large number of how-to articles on human daily life events. We perform a coarse-to-fine event discovery process and discover 500 events from WikiHow articles. Then we use each event name as query to search YouTube and discover event-specific concepts from the tags of returned videos. After an automatic filter process, we end up with 95, 321 videos and 4, 490 concepts. We train a Convolutional Neural Network (CNN) model on the 95, 321 videos over the 500 event...

• Type: Journal
• Year: 2015
• Where: MM
• Authors: Guangnan Ye, Yitong Li, Hongliang Xu, Dong Liu, Shih-Fu Chang
• Keywords: MM 2015, Multimedia