Object trajectory proposal

We propose a novel method for video object proposal to generate sequences of bounding boxes for each object candidate in videos, namely object trajectory proposals. Unlike the image-based methods that produce object proposals independently in each video frame, our method generates temporally consistent proposals in the form of object trajectories, which is crucial for subsequent analysis of object appearance and motion characteristics. Given a video, we extract motion seeds through estimating the outliers of global motion, and generate moving object trajectory proposals from the seeds. By ignoring the motion outliers, we consistently sample bounding boxes with pruning to form static object trajectory proposals. Finally, we rank both the moving and static object trajectory proposals under a unified scoring mechanism. The experimental results show that our method can effectively generate object trajectory proposals and outperform the state-of-the-art methods.