Identification of Partitions in a Homogeneous Activity Group Using Mobile Devices

Abstract EN

People in public areas often appear in groups.

People with homogeneous coarse-grained activities may be further divided into subgroups depending on more fine-grained behavioral differences.

Automatically identifying these subgroups can benefit a variety of applications for group members.

In this work, we focus on identifying such subgroups in a homogeneous activity group (i.e., a group of people who perform the same coarse-grained activity at the same time).

We present a generic framework using sensors built in commodity mobile devices.

Specifically, we propose a two-stage process, sensing modality selection given a coarse-grained activity, followed by multimodal clustering to identify subgroups.

We develop one early fusion and one late fusion multimodal clustering algorithm.

We evaluate our approaches using multiple datasets; two of them are with the same activity while the other has a different activity.

The evaluation results show that the proposed multimodal-based approaches outperform existing work that uses only one single sensing modality and they also work in scenarios when manually selecting one sensing modality fails.