Description of sl2dpca_construct

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sl2dpca_construct

PURPOSE

SL2DPCA_CONSTRUCT Constructs the matrix from 2D feature

SYNOPSIS

function X = sl2dpca_construct(Mm, PL, PR, Y)

DESCRIPTION

SL2DPCA_CONSTRUCT Constructs the matrix from 2D feature

 $ Syntax $
   - X = sl2dpca_construct(Mm, PL, PR, Y)

 $ Arguments $
   - Mm:       the mean matrix
   - PL:       the left projection matrix
   - PR:       the right projection matrix
   - Y:        the extracted 2D features
   - X:        the constructed matrices

 $ Description $
   - X = sl2dpca_construct(Mm, PL, PR, Y) constructs the matrices in
     original size using a 2D PCA model characterized by mean matrix and
     the left and right projection matrices. 

 $ History $
   - Created by Dahua Lin, on Jul 31st, 2006

CROSS-REFERENCE INFORMATION

This function calls:

This function is called by:

SOURCE CODE

0001 function X = sl2dpca_construct(Mm, PL, PR, Y)
0002 %SL2DPCA_CONSTRUCT Constructs the matrix from 2D feature
0003 %
0004 % $ Syntax $
0005 %   - X = sl2dpca_construct(Mm, PL, PR, Y)
0006 %
0007 % $ Arguments $
0008 %   - Mm:       the mean matrix
0009 %   - PL:       the left projection matrix
0010 %   - PR:       the right projection matrix
0011 %   - Y:        the extracted 2D features
0012 %   - X:        the constructed matrices
0013 %
0014 % $ Description $
0015 %   - X = sl2dpca_construct(Mm, PL, PR, Y) constructs the matrices in
0016 %     original size using a 2D PCA model characterized by mean matrix and
0017 %     the left and right projection matrices.
0018 %
0019 % $ History $
0020 %   - Created by Dahua Lin, on Jul 31st, 2006
0021 %
0022 
0023 %% Parse and verify input arguments
0024 
0025 if ndims(Mm) ~= 2
0026     error('sltoolbox:invalidarg', ...
0027         'Mm should be a 2D matrix');
0028 end
0029 [d1, d2] = size(Mm);
0030 if size(PL, 1) ~= d1 || size(PR, 1) ~= d2
0031     error('sltoolbox:sizmismatch', ...
0032         'Inconsistent size for 2D PCA model');
0033 end
0034 k1 = size(PL, 2);
0035 k2 = size(PR, 2);
0036 if size(Y, 1) ~= k1 || size(Y, 2) ~= k2
0037     error('sltoolbox:sizmismatch', ...
0038         'The feature size is inconsistent with the 2D PCA model');
0039 end
0040 
0041 %% Construct
0042 
0043 n = size(Y, 3);
0044 X = zeros(d1, d2, n);
0045 PRT = PR';
0046 
0047 for i = 1 : n
0048     X(:,:,i) = PL * Y(:,:,i) * PRT + Mm;
0049 end
0050 
0051

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