function image_edge
%IMAGE_EDGE Find the edges of the image.
%
%		IMAGE_EDGE
%
%

%
% Copyright (c) 1995 by Claudio Rivetti and Mark Young
% claudio@alice.uoregon.edu,    mark@alice.uoregon.edu
%

global I Oldzrange Oldcontrast Oldoffset Oldmap Undofun 

if isempty(I)
  return;
end

if ~isimage
  setviewmode('TOPVIEW');
  showimage;
end

statusbar('Finding image edges...');
Oldzrange=zrange;
Oldcontrast=getcontrast;
Oldoffset=getoffset;
Oldmap=getmap;

zrange([0 1]);
setcontrast(0);
setoffset(0);
setmap(30);
setimage(edge(I));
Undofun=['global Oldzrange Oldcontrast Oldoffset Oldmap;zrange(Oldzrange);',...
                'setimage(getclipboard,inf,0);setcontrast(Oldcontrast);',...
                'setoffset(Oldoffset);setmap(Oldmap);setclipboard([]);'];

clearstatusbar;

return