We propose a deep learning-based framework for instance-level object segmentation. Our method mainly consists of three steps. First, We train a generic model based on ResNet-101 for foreground/background segmentations. Second, based on this generic model, we fine-tune it to learn instance-level models and segment individual objects by using augmented object annotations in first frames of test videos. To distinguish different instances in the same video, we compute a pixel-level score map for each object from these instance-level models. Each score map indicates the objectness likelihood and is only computed within the foreground mask obtained in the first step. To further refine this per frame score map, we learn a spatial propagation network. This network aims to learn how to propagate a coarse segmentation mask spatially based on the pairwise similarities in each frame. In addition, we apply a filter on the refined score map that aims to recognize the best connected region using spatial and temporal consistencies in the video. Finally, we decide the instance-level object segmentation in each video by comparing score maps of different instances.

本文提出了一种基于深度学习的实例级对象分割框架，其中包括使用ResNet-101进行前景/背景分割的通用模型训练，基于该通用模型接受带标注对象的训练数据，通过迭代学习实例级模型的方法以及使用空间传播网络和滤波器对分割结果进行进一步优化，以实现不同视频中的实例级对象分割。

使用空间传播网络在视频中学习实例分割