  Affordance grounding, a task to ground (i.e., localize) action possibility
region in objects, which faces the challenge of establishing an explicit link
with object parts due to the diversity of interactive affordance. Human has the
ability that transform the various exocentric interactions to invariant
egocentric affordance so as to counter the impact of interactive diversity. To
empower an agent with such ability, this paper proposes a task of affordance
grounding from exocentric view, i.e., given exocentric human-object interaction
and egocentric object images, learning the affordance knowledge of the object
and transferring it to the egocentric image using only the affordance label as
supervision. To this end, we devise a cross-view knowledge transfer framework
that extracts affordance-specific features from exocentric interactions and
enhances the perception of affordance regions by preserving affordance
correlation. Specifically, an Affordance Invariance Mining module is devised to
extract specific clues by minimizing the intra-class differences originated
from interaction habits in exocentric images. Besides, an Affordance
Co-relation Preserving strategy is presented to perceive and localize
affordance by aligning the co-relation matrix of predicted results between the
two views. Particularly, an affordance grounding dataset named AGD20K is
constructed by collecting and labeling over 20K images from 36 affordance
categories. Experimental results demonstrate that our method outperforms the
representative models in terms of objective metrics and visual quality. Code:
github.com/lhc1224/Cross-View-AG.
