This paper starts by describing what morphing means and
briefly discussing different 3d and 2d techniques that
can be used to accomplish image metamorphosis.
Its main contribution is introducing a method to do
image metamorphosis using pairs of line that specify
features on the source and target images.
It uses image deformation as reverse mapping which
is for each pixel in the dest image, finding the
coordinates of in the source image.
It describes how to do this under simple single line
pair situation and how to expand it into mutiple pairs
on line situations using weights that depend on the
distance from the line.
The main advantage of the method is easier to use
user interfaces due to less initial planning and
less control points that artists have to deal with.
Finding a way to implement this using shader and
making it real-time might be an interesting project.