ppmfilt.m

machine vision 工具箱

%PPMFILT	Pipe image through PPM utility
%
%	f = ppmfilt(r, g, b, cmd)
%
%	Pipe color image through a Unix filter program.  Input and output 
%	image formats are PPM.
%
% SEE ALSO: xv loadppm saveppm
%
%	Copyright (c) Peter Corke, 1999  Machine Vision Toolbox for Matlab

% 1999 Peter Corke

function [r, g, b] = ppmfilt(r, g, b, 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)];

	saveppm(fname, r, g, b);
	unix([cmd ' < ' fname ' > ' fname2]);
	[r, g, b] = loadppm(fname2);
	unix(['/bin/rm ' fname ' ' fname2]);