Object-Oriented Video Captioning with Temporal Graph and Prior Knowledge Building

Traditional video captioning requests a holistic description of the video, yet the detailed descriptions of the specific objects may not be available. Besides, most methods adopt frame-level inter-object features and ambiguous descriptions during training, which is difficult for learning the vision-language relationships. Without associating the transition trajectories, these image-based methods cannot understand the activities with visual features. We propose a novel task, named object-oriented video captioning, which focuses on understanding the videos in object-level. We re-annotate the object-sentence pairs for more effective cross-modal learning. Thereafter, we design the video-based object-oriented video captioning (OVC)-Net to reliably analyze the activities along time with only visual features and capture the vision-language connections under small datasets stably. To demonstrate the effectiveness, we evaluate the method on the new dataset and compare it with the state-of-the-arts for video captioning. From the experimental results, the OVC-Net exhibits the ability of precisely describing the concurrent objects and their activities in details.