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3. PREVIOUS WORK AT STANFORD.
This proposal is based on work by Bruce G. Baumgart as a
graduate student. Mr. Baumgart expects to complete his dissertation
entitled "Geometric Vision" in early 1974 and will continue as a
research associate on receiving his degree.
This work includes GEOMED, a Geometric Editor, which would
be the prototype of the mechanical drawing system we propose to
build. GEOMED is a 3D drawing program (controled mostly by
keyboard); that can construct arbitrary polyhedral objects and
display them with hidden lines eliminated. GEOMED also accepts TV
images and can form polyhedron models consistent with such images.
The subroutines and data structures of GEOMED have been
embedded in LISP and SAIL (Stanford Algol) to provide geometric
languages for physical world modeling and physical action
simulation. The current embedded versions of GEOMED fall short in
that adequate error recovery and memory allocation is currently
lacking.
The image processing part of Mr. Baumgart's work lies in a
program named CRE, standing for Contour, Region, Edge image
representation. CRE converts a sequence of digital television
images into a contour edge data structure for interpretation by
other programs. Finally, there is TVFONT, which is a version of CRE
for making type font bit arrays from television images, or for
rescaling existing fonts.