Ever since the assassination of U.S. President Kennedy, numerous
theories have circulated purporting that Lee Harvey Oswald, the
accused assassin, acted as part of a larger criminal conspiracy. It
has been suggested, for example, that incriminating photographs of
Oswald were manipulated, and hence evidence of a broader plot.
Specifically, it has been argued that the lighting and shadows in
these photos are physically impossible. Because the visual system is
often unable to reliably judge 3-D geometry and lighting, we performed
a detailed 3-D analysis of the Oswald photos to determine if claims of
tampering are warranted.