getview.m

matlab处理图像的一些基本方法。其中有一部分mex程序需要安装编译

function [M, coord]=getview(c)
%	GETVIEW - returns the image submatrix corresponding to the current view.
%
%	[M, COORD] = GETVIEW(C)
%
%		inputs:
%			C - the current view, a vector of [xmin xmax ymin ymax].
%		outputs:
%			M - 	the returned submatrix of I, the image matrix
%			COORD - the returned  current view.
%
%	Claudio  spring of 1995

%
% Copyright (c) 1995 by Claudio Rivetti and Mark Young
% [e-mail],    [e-mail]
%

global I H Handleimgax


if nargin==0 
c=[];
end

if isempty(c)
  axes(Handleimgax);
  c=axis;
  ss=scansize(H);
  sl=size(I,1);
  xoff = xoffset(H);
  yoff = yoffset(H);
  c(1:2) = c(1:2) - xoff; c(3:4) = c(3:4) - yoff;  
  c=round(c*sl/ss);
end

if c(3)<1, c(3)=1;end
if c(1)<1, c(1)=1;end
if c(4)>sl, c(4)=sl;end
if c(2)>sl, c(2)=sl;end

M=I(c(3):c(4), c(1):c(2));
coord=c;

return