perm filename 14[DOC,BGB] blob
sn#095876 filedate 1974-04-05 generic text, type T, neo UTF8
COMMENT ⊗ VALID 00002 PAGES
RECORD PAGE DESCRIPTION
00001 00001
00002 00002 ~λ13P14JUFA
00004 ENDMK
⊗;
~λ13;P14;JUFA
2.11 Video Derived Polyhedra.
~JU;FA The easiest way to make a polyhedron from a video image is to
sweep the silhouette of an intensity contour from the program
CRE (a video
contouring program). The CRE commands "T" for take, "C" for contour
and "αO" for output contoured image will yield a disk file suitable
for input to GEOMED. Using GEOMED commands: "βI" will input a CRE
file and create a face, edge, vertex data structure on the now camera
node that corresponds to the contoured image;
~JA;FA
0. TC10αOHAND.CRE CRE Commands to take, contour and output.
1. βIHAND.CRE GEOMED input from CRE file.
2. αC... Locate a suitable contour body node.
3. XSIL <ZMIN> <ZMAX> Sweep out silouhette polyhedron.
~L0,-200;JUFA
The CRE program is documented in Stanford A.I. Memo #199, titled
`Image Contouring and Comparing', written by Baumgart.
The more elaborate example of video assisted drawing is demonstrated by
the water pump below; the shape of the base and the holes in the
base were derived from a video image.
~L0,50;H2;X0.6;*HAND.PLT;
L0,-600;H2;X0.6;*PUMP.PLT;