Joseph Modayil, Tongxin Bai, and Henry Kautz. 2008.
Improving the recognition of interleaved activities.
Tenth International Conference on Ubiquitous Computing (Ubicomp 2008), pages 40--43.


We introduce Interleaved Hidden Markov Models for recognizing multitasked activities. The model captures both inter-activity and intra-activity dynamics. Although the state space is intractably large, we describe an approximation that is both effective and efficient. This method significantly reduces the error rate when compared with previously proposed methods. The algorithm is suitable for mobile platforms where computational resources may be limited.