  In this paper, we address a novel problem of cloning a patch of the source
spherical panoramic image to the target spherical panoramic image, which we
call 360 panorama cloning. Considering the sphere geometry constraint embedded
in spherical panoramic images, we develop a coordinate-based method that
directly clones in the spherical domain. Our method neither differentiates the
polar regions and equatorial regions, nor identifies the boundaries in the
unrolled planar-formatted panorama. We discuss in depth two unique issues in
panorama cloning, i.e. preserving the patch's orientation, and handling the
large-patch cloning (covering over 180 field of view) which may suffer from
discoloration artifacts. As experimental results demonstrate, our method is
able to get visually pleasing cloning results and achieve real time cloning
performance.
