applylut.m

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function B = applylut(A,LUT)
%APPLYLUT Perform neighborhood operations using lookup tables.
%   A = APPLYLUT(BW,LUT) performs a 2-by-2 or 3-by-3
%   neighborhood operation on binary image BW by using a lookup
%   table (LUT).  LUT is either a 16-element or 512-element
%   vector returned by MAKELUT.  The vector consists of the
%   output values for all possible 2-by-2 or 3-by-3
%   neighborhoods.
%
%   The values returned in A depend on the values in LUT. For
%   example, if LUT consists of all 1's and 0's, A is a binary
%   image.
%
%   Class Support
%   -------------
%   BW and LUT can be of class uint8 or double.  If the class of
%   LUT is uint8, or if the elements of LUT are all integer
%   values between 0 and 255, then the class of A is uint8;
%   otherwise, the class of A is double.
%
%   Example
%   -------
%   In this example, you perform erosion using a 2-by-2
%   neighborhood. An output pixel is "on" only if all four of the
%   input pixel's neighborhood pixels are "on."
%
%       lut = makelut('sum(x(:)) == 4', 2);
%       BW1 = imread('text.tif');
%       BW2 = applylut(BW1,lut);
%       imshow(BW1)
%       figure, imshow(BW2)
%
%   See also MAKELUT.

%   Steve Eddins, March 1996
%   Copyright 1993-1998 The MathWorks, Inc.  All Rights Reserved.
%   $Revision: 1.7 $  $Date: 1997/11/24 15:33:54 $

error('Missing MEX-file APPLYLUT');