getzoom.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 [z, pos]=getzoom(h)
%GETZOOM Get the actual zoom.
%
%	[Z, CPOS]=GETZOOM(AX)
%
%	AX is the axes handle.
%	Z is the number of zooming
%	CPOS is the x,y coordinate of the center.
%
%	See also IMZOOM

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

global H


if nargin > 1
  error('Too many input arguments.');
end

if nargin == 0
  h=gca;
end

axes(h);

ax=axis;
ss=scansize(H);
z=log(ss/(ax(2)-ax(1)))/log(2);
pos=[ax(1)+(ax(2)-ax(1))/2  ax(3)+(ax(4)-ax(3))/2];