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Gaze- and Spacing-flow Unveil Intentions: Hidden Follower Discovery

We raise a new and challenging multimedia application in video surveillance system, i.e., Hidden Follower Discovery (HFD). In contrast to the common abnormal behaviors that are occurring, hidden following is not an ongoing activity, but a preparatory action. Hidden following behavior does not have salient features, making it hard to be discovered. Fortunately, from a socio-cognitive perspective, we found and verified the phenomena that the gaze-flow pattern and the spacing-flow pattern between hidden and normal followers are different. To promote HFD research, we construct two pioneering datasets and devise an HFD baseline network based on the recognition of both gaze-flow and spacing-flow patterns from surveillance videos. Extensive experiments demonstrate their effectiveness.