pgmfilt.m

这是一个基于MATLAB的机器视觉工具箱,里面用很多非常有价值的的程序

%PGMFILT	Pipe image through PGM utility
%
%	f = pgmfilt(im, cmd)
%
%	Pipe image through a Unix filter program.  Input and output image 
%	formats	are PGM.
%
% SEE ALSO: xv
%
%	Copyright (c) Peter Corke, 1999  Machine Vision Toolbox for Matlab

% 1996 Peter Corke

function im2 = pgmfilt(im, cmd)

	% MATLAB doesn't support pipes, so it all has to be done via temp files...

	% make up two file names
	fname = ['/tmp/xv' num2str(rand)];
	fname2 = ['/tmp/xv' num2str(rand)];

	savepgm(fname, im);
	unix([cmd ' < ' fname ' > ' fname2]);
	im2 = loadpgm(fname2);
	unix(['/bin/rm ' fname ' ' fname2]);