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• W2895768235 abstract "Video-based facial expression recognition has received substantial attention over the past decade, while early expression detection (EED) is still a relatively new and challenging problem. The goal of EED is to identify an expression as quickly as possible after the expression starts and before it ends. This timely ability has many potential applications, ranging from human-computer interaction to security. The max-margin early event detector (MMED) is a well-known ranking model for early event detection. It can achieve competitive EED performance but suffers from several critical limitations: 1) MMED lacks flexibility in extracting useful information for segment comparison, which leads to poor performance in exploring the ranking relation between segment pairs; 2) the training process is slow due to the large number of constraints, and the memory requirement is also usually hard to satisfy; and 3) MMED is linear in nature, and hence may not be appropriate for data in a nonlinear feature space. To overcome these limitations, we propose an online multi-instance learning (MIL) framework for EED. In particular, the MIL technique is first introduced to generalize MMED, resulting in the proposed MIL-based EED (MIED), which is more general and flexible than MMED, since various instance construction and combination strategies can be adopted. To accelerate the training process, we reformulate MIED in the online setting and develop online multi-instance learning framework for EED (OMIED). To further exploit the nonlinear structure of the data distribution, we incorporate the kernel methods in OMIED, which results in the proposed online kernel multi-instance learning for early expression detection. Experiments on two popular and one challenging video-based expression data sets demonstrate both the efficiency and effectiveness of the proposed methods." @default.
• W2895768235 created "2018-10-12" @default.
• W2895768235 creator A5001819736 @default.
• W2895768235 creator A5010039524 @default.
• W2895768235 creator A5051266803 @default.
• W2895768235 date "2019-05-01" @default.
• W2895768235 modified "2023-10-14" @default.
• W2895768235 title "Early Expression Detection via Online Multi-Instance Learning With Nonlinear Extension" @default.
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• W2895768235 doi "https://doi.org/10.1109/tnnls.2018.2869891" @default.
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• W2895768235 hasPublicationYear "2019" @default.
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