Science Daily 9/25/06:

"Computer Hunt For Rock Carvings"

"A new imaging technique is helping archaeologists to find, interpret and
conserve rock carvings in digital format.

The technology that archaeologists and ICT researchers have recently adopted
is called 'structured light'. It is a method that quickly and easily reads
off the three-dimensional shape of an object with the aid of a camera and a
video projector. The images are transferred to a computer, which constructs
a detailed three-dimensional model of the object. The method is normally
used in reverse engineering, the process of making a 3D computer model of an
existing physical object."

More:

http://www.sciencedaily.com/releases/2006/09/060925084617.htm