Our target is to learn visual correspondence from unlabeled videos. We
develop LIIR, a locality-aware inter-and intra-video reconstruction framework
that fills in three missing pieces, i.e., instance discrimination, location
awareness, and spatial compactness, of self-supervised correspondence learning
puzzle. First, instead of most existing efforts focusing on intra-video
self-supervision only, we exploit cross video affinities as extra negative
samples within a unified, inter-and intra-video reconstruction scheme. This
enables instance discriminative representation learning by contrasting desired
intra-video pixel association against negative inter-video correspondence.
Second, we merge position information into correspondence matching, and design
a position shifting strategy to remove the side-effect of position encoding
during inter-video affinity computation, making our LIIR location-sensitive.
Third, to make full use of the spatial continuity nature of video data, we
impose a compactness-based constraint on correspondence matching, yielding more
sparse and reliable solutions. The learned representation surpasses
self-supervised state-of-the-arts on label propagation tasks including objects,
semantic parts, and keypoints.

利用 LIIR，一种局部感知的交叉和内部视频重建框架，填补了自监督一致性学习中的三个缺失部分，即实例区分、位置感知和空间紧凑性，从而学习视觉对应关系。