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@pagefooting(immediate, left "@c<Technical Report 1996>",
center "@c<Computer Science>",
right "@c<Carnegie Mellon>")
@heading(3D Shape and Reflectance Morphing)
@heading(CMU-CS-96-168)
@center(@b(Yoichi Sato, Imari Sato, Katsushi Ikeuchi))
@center(September 1996)
@center(FTP: Unavailable)
@blankspace(1)
@begin(text)

Image morphing techniques can create a smooth transition between two
images.  However, one of the main weaknesses of the image morphing
technique is that intermediate images in the transition often have
physically incorrect shading such as highlights and shadows.  Moreover,
we cannot alter viewing and lighting conditions when creating the 
intermediate images.  That is because those images are obtained by
simply interpolating pixel intensities of the two 2D images without knowledge
of 3D object shape and reflectance properties. In this context, 3D shape
morphing techniques have a definite advantage in that arbitrary viewing
and illumination conditions can be used for creating new images.

Unfortunately, previous 3D morphing techniques do not account for object
surface reflectance properties or reflection models when generating
intermediate images.  This often results in undesired shading artifacts.
In this paper, we consider a new approach for 3D shape and reflectance
morphing of two real 3D objects.  Our morphing method consists of two
components: shape and reflectance property measurement, and smooth
interpolation of those measured properties.  The measured shape and
reflectance parameters are stored in a 2D image, each of whose image pixel
has reflectance parameters and an @i<(X, Y, Z)> location of the coresponding
surface point. The 2D image is referred to as the @i(object image) in this
paper.  A range image and color image sequence of an object are used to
create an object image for each of the two real objects.  Then, those two
object images are used to create an intermediate object image by
interpolating the shape and reflectance parameters.  Finally, the newly
created intermediate object image is used to render the intermediate
image of the two objects.





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@b(Keywords:@ )@c<Computer vision, computer graphics, reflectance measurement,
shape morphing>
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@end(text)
@flushright(@b[(26 pages)])