ldimgff.m

等高线拟合源代码（matlab源码）

function [img] = ldmimgff(name);

% LDIMGFF: Load image from file (Part of GUI)

% All the software included in this package is presented as is.
% It may be distributed freely. The author can, however, not be
% held responsible for any problems whatever.
% 
% Designed by Johan Baeten.
% Last updated: 22-03-2000
% [e-mail]

global XSIZE;
global YSIZE;
global IMAGENAME
global MAINFIG
global NEWIMAGENAME
global MAP

%nargs= nargin;

if nargin == 0,
  [filename, PATHNAME]= uigetfile('*.pgm','Select Image');
else
   filename = name;
end

len = length(filename);
if (len < 4),      % probally cancel in uigetfile
  seterror([' ... cancelled']);
  return;
end

filename = lower(filename);
ext = filename(len-3:len);
if ~((strcmp(ext,'.gry'))|(strcmp(ext,'.pgm'))),
   seterror(' ... Only ''.gry'' and ''.pgm'' supported.');      
   return;
end


fid = fopen(filename);
if (fid == -1),
   seterror(' ... Can''t load file. File doesn''t exist');
   % this can/should never happen
else

   if strcmp(filename(len-2:len),'gry'),
      seterror([' ... Opening ',filename,' with set image sizes.']);
      watchon;
      drawnow;
      [a]=fscanf(fid,'%c',[XSIZE YSIZE]);
      fclose(fid);
   else
      seterror([' ... Opening ',filename]);
      watchon;
      drawnow;      
      format = fscanf(fid,'%s',1);
      XSIZE = fscanf(fid,'%d',1);
      YSIZE = fscanf(fid,'%d',1);
      grayvalues = fscanf(fid,'%d',1);
      dummy = fscanf(fid,'%c',1);
      [a]=fscanf(fid,'%c',[XSIZE YSIZE]);
      fclose(fid);
      MAP = gray(255);
   end

   IMAGENAME = filename;

   if (XSIZE <= 64) & (YSIZE <= 64),
      setting('imagesize64');
   elseif (XSIZE <= 128) & (YSIZE <= 128),
      setting('imagesize128');
   elseif (XSIZE <= 256) & (YSIZE <= 256),
      setting('imagesize256');
   elseif (XSIZE <= 512) & (YSIZE <= 512),
      setting('imagesize512');
   else
      setting('imagesizenn');
   end


   set(MAINFIG,'userdata',(abs(a)'));

	if nargout == 0,
   	set(findobj(gca,'type','image'),'cdata',(abs(a)'));  
      setting ('showimage');
      setting('drawaxes');
   	setting('saveimageenableon');
	   drawnow;
	else
	   img = (abs(a)') ;
	end
   watchoff;
end