  The head swapping task aims at flawlessly placing a source head onto a target
body, which is of great importance to various entertainment scenarios. While
face swapping has drawn much attention, the task of head swapping has rarely
been explored, particularly under the few-shot setting. It is inherently
challenging due to its unique needs in head modeling and background blending.
In this paper, we present the Head Swapper (HeSer), which achieves few-shot
head swapping in the wild through two delicately designed modules. Firstly, a
Head2Head Aligner is devised to holistically migrate pose and expression
information from the target to the source head by examining multi-scale
information. Secondly, to tackle the challenges of skin color variations and
head-background mismatches in the swapping procedure, a Head2Scene Blender is
introduced to simultaneously modify facial skin color and fill mismatched gaps
in the background around the head. Particularly, seamless blending is achieved
with the help of a Semantic-Guided Color Reference Creation procedure and a
Blending UNet. Extensive experiments demonstrate that the proposed method
produces superior head swapping results in a variety of scenes.
