A relevant subject of finding planar paths is called Active Contours and Snakes.
Active Contours, Deformable Models, and Gradient Vector Flow http://iacl.ece.jhu.edu/projects/gvf/ A.Blake, M.Isard, "Active Contours" (Introduction, p.17 has just what you ask) http://research.microsoft.com/~ablake/contours/ General http://www.google.com/search?q=active+contours+image http://www.google.com/search?q=active+contour+matlab http://www.google.com/search?hl=en&q=%22image+contour%22+tracking+filetype%3Apdf --- Oleg Kobchenko <[EMAIL PROTECTED]> wrote: > Here's something simple: > > For each plane, > - determine a non-self-intersecting closed path of largest > area that is the boundary between the inner and outer > regions of the body; > - find the center of the path (e.g. center of mass) and > place N points on the path where equiangular rays > from center intersect with it.* > Build OpenGL GL_QUAD_STRIP between each adjacent pairs > of planes matching their 0..N points. > > ______ > * This requires one intersection per ray. > Alternatively, without finding the center, break the > path into N equidistant segments, starting from e.g. (0,max{y}). > > > --- Bj�rn Helgason <[EMAIL PROTECTED]> wrote: > > > I have been working with images in a plane x and y coordinates. > > Thanks to members of this forum I have successfully been able to locate > > objects in that plane and do calculations related to it. > > > > Now I am interested in looking in the z direction. > > > > I have as an example 300 images which are slices through a head from a CT. > > Each slice is a x,y plane and there are objects to be investigated in each > > plane like a slice through the brain. > > > > The same object can then exist in several slices with variations. > > Each slice is interesting but it would be even more interesting to be able > > to put the x,y planes together and be able to look in the z direction and > > also be able to rotate the 3D object. > > > > Then make slices through the cube from various angles. > > > > Is there a tool available in J to do this already? > > > > I have seen various 3D demos but I am not sure if they have been using > > something like 300 BMP files for input. > > > > I do have a Dicom viewer that can look at the images in the way I am > > describing here above and there are a number of tools available to do parts > > of what I want. > > They are all lacking what I have in J in the form of giving a programming > > access to the information I am looking at to combine it with other things of > > interest. ____________________________________________________________________________________ Now that's room service! Choose from over 150,000 hotels in 45,000 destinations on Yahoo! Travel to find your fit. http://farechase.yahoo.com/promo-generic-14795097 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
