Complementary-View Co-Interest Person Detection

Fast and accurate identification of the co-interest persons, who draw joint interest of the surrounding people, plays an important role in social scene understanding and surveillance. Previous study mainly focuses on detecting co-interest persons from a single-view video. In this paper, we study a much more realistic and challenging problem, namely co-interest person~(CIP) detection from multiple temporally-synchronized videos taken by the complementary and time-varying views. Specifically, we use a top-view camera, mounted on a flying drone at a high altitude to obtain a global view of the whole scene and all subjects on the ground, and multiple horizontal-view cameras, worn by selected subjects, to obtain a local view of their nearby persons and environment details. We present an efficient top- and horizontal-view data fusion strategy to map multiple horizontal views into the global top view. We then propose a spatial-temporal CIP potential energy function that jointly considers both intra-frame confidence and inter-frame consistency, thus leading to an effective Conditional Random Field~(CRF) formulation. We also construct a complementary-view video dataset, which provides a benchmark for the study of multi-view co-interest person detection. Extensive experiments validate the effectiveness and superiority of the proposed method.