loc_im_display.m

显示一个黑白图像。去掉matlab的边框。

function loc_im_display(varargin)
% displays image in a window whose position, scaling and colormap can be specified
% if parameters are omitted then default values are used
% 
% Arguments: im    - matrix (array) of values
%            sf    - scale factor (default is 2)
%            xpos  - x position on screen (default is 100)
%            ypos  - y position on screen (default is same as xpos)
%            cmap  - colormap (default is 256 linear grayscale)
%
% Usage: loc_im_display(im,sf,xpos,ypos,cmap);
%
% Author: D.Renshaw 
%

%define defaults
sf=2; xpos=100; ypos=100;

%create a linear 256 grayscale colormap
for i=1:256
    for j=1:3
        gscmap256(i,j) = (i-1)/255;
    end
end

cmap=gscmap256;

%check number of input arguments and overwrite defaults as required
if (nargin < 1)
    error('not enough input arguments')
end
im = varargin{1};
if (nargin > 1)
    sf = round(varargin{2}(1)); %redefine the colormap
end
if (nargin > 2)
    xpos = round(varargin{3}(1));
    ypos = xpos;
end
if (nargin > 3)
    ypos = round(varargin{4}(1));
end
if (nargin > 4)
    cmap = varargin{5};
end

%get and check array size
m = size(im,1);
n = size(im,2);
if m==0 || n==0
    error('Degenerate array.')
end

%display the image 
figure('Position',[xpos ypos sf*size(im,2) sf*size(im,1)]); 
image(im); colormap(cmap)
set(gca,'Position',[0 0 1 1])