wcodemat
Extended pseudocolor matrix scaling
Syntax
Y = wcodemat(X)
Y = wcodemat(X,NBCODES)
Y = wcodemat(X,NBCODES,OPT)
Y = wcodemat(X,NBCODES,OPT,ABSOL)
Description
wcodemat rescales an input matrix to a
specified range for display. If the specified range is the full range
of the current colormap, wcodemat is similar
in behavior to imagesc.
Y = wcodemat(X) rescales the matrix X to
integers in the range [1,16].
Y = wcodemat(X,NBCODES) rescales the input X as
integers in the range [1,NBCODES] . The default
value of NBCODES is 16.
Y = wcodemat(X,NBCODES,OPT) rescales the matrix along the dimension
specified by OPT. OPT can be one of:
'column' (or 'c'), 'row'
(or 'r'), and 'mat' (or 'm').
'rows' scales X row-wise,
'column' scales X column-wise, and
'mat' scales X globally. The default value of
OPT is 'mat'.
Y = wcodemat(X,NBCODES,OPT,ABSOL) rescales
the input matrix X based on the absolute values
of the entries in X if ABSOL is
nonzero, or based on the signed values of X if ABSOL is
equal to zero. The default value of ABSOL is 1.
Examples
Extended Pseudocolor Matrix Scaling
Scale level-one approximation coefficients globally to the full range of the colormap.
Load an image.
load woman;Get the range of the colormap.
NBCOL = size(map,1);
Obtain the 2D dwt using the Haar wavelet.
[cA1,cH1,cV1,cD1] = dwt2(X,'db1');Display without scaling and with scaling.
image(cA1);
colormap(map);
title('Unscaled Image');
figure
image(wcodemat(cA1,NBCOL));
colormap(map);
title('Scaled Image');