Multiview Co-segmentation for Wide Baseline Images using Cross-view Supervision

This paper presents a method to co-segment an object from wide baseline multiview images using cross-view self-supervision. A key challenge in the wide baseline images lies in the fragility of photometric matching. Inspired by shape-from-silhouette that does not require photometric matching, we formulate a new theory of shape belief transfer---the segmentation belief in one image can be used to predict that of the other image through epipolar geometry. This formulation is differentiable, and therefore, an end-to-end training is possible. We analyze the shape belief transfer to identify the theoretical upper and lower bounds of the unlabeled data segmentation, which characterizes the degenerate cases of co-segmentation. We design a novel triple network that embeds this shape belief transfer, which is agnostic to visual appearance and baseline. The resulting network is validated by recognizing a target object from realworld visual data including non-human species and a subject of interest in social videos where attaining large-scale annotated data is challenging.