EflUtlUl~ operations within a run-lengt h en~ode d data structure are di scuss ed , inc ludIng area access , reg ion growing, edge follow ing, and corner identification. I DD I ~~~~~~ 1473 EDITION OF I NOV 41 iS OSSOLE1' E
It is often important to obtain descriptions of existing objects for computer graphics data bases. A system to aid interactive modeling (in three dimensions) of a physical object is" described. The system allows a user to fit a hi-cubic parametric spline surface to an object by superimposing stereoscopic views of the computer surface with stereoscopic television views of the object. A 3-D joystick is used to manipulate surface control points while the user views the computed surface as isoparametric contours.A raster scan display polarization stereoscope is used.The left eye and right eye surface views are computed using a unique display processor designed and constructed for the evaluation of raster scan graphics techniques.The display processor consists of multiple non-pipelined concurrently operating microprogrammed modules.The computation of the two reasonably complex images (>500 vectors each) takes less than 33 msec allowing real time display at standard television rates.
It is often important to obtain descriptions of existing objects for computer graphics data bases. A system to aid interactive modeling (in three dimensions) of a physical object is described. The system allows a user to fit a bi-cubic parametric spline surface to an object by superimposing stereoscopic views of the computer surface with stereoscopic television views of the object. A 3-D joystick is used to manipulate surface control points while the user views the computed surface as isoparametric contours.
A raster scan display polarization stereoscope is used.
The left eye and right eye surface views are computed using a unique display processor designed and constructed for the evaluation of raster scan graphics techniques. The display processor consists of multiple non-pipelined concurrently operating microprogrammed modules. The computation of the two reasonably complex images (>500 vectors each) takes less than 33 msec allowing real time display at standard television rates.
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