imagehist.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 imagehist
%IMAGEHISH  Display the image Histogram

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

global Handleimg
  

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

cmap=colormap;

[flag, fig]=figflag('Image Histogram',0);

if ~flag
  fig=figure('position', [600 300 560 420], 'NumberTitle', 'off', 'name', 'Image Histogram');
else
  set(fig, 'nextplot', 'replace');
end

c=get(Handleimg, 'cdata');

cmin=min(min(c));
if cmin<1
  c=c-cmin+1;
end

j=find(c>size(cmap,1));
if ~isempty(j)
  c(j)=c(j)*0 + size(cmap,1);
end

imhist(c, cmap);
zoom on
set(fig,  'nextplot', 'new');

return