  Our brain can effortlessly recognize objects even when partially hidden from
view. Seeing the visible of the hidden is called amodal completion; however,
this task remains a challenge for generative AI despite rapid progress. We
propose to sidestep many of the difficulties of existing approaches, which
typically involve a two-step process of predicting amodal masks and then
generating pixels. Our method involves thinking outside the box, literally! We
go outside the object bounding box to use its context to guide a pre-trained
diffusion inpainting model, and then progressively grow the occluded object and
trim the extra background. We overcome two technical challenges: 1) how to be
free of unwanted co-occurrence bias, which tends to regenerate similar
occluders, and 2) how to judge if an amodal completion has succeeded. Our
amodal completion method exhibits improved photorealistic completion results
compared to existing approaches in numerous successful completion cases. And
the best part? It doesn't require any special training or fine-tuning of
models.
