addlift

Add lifting steps to lifting scheme

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Syntax

LSN = addlift(LS,ELS)
LSN = addlift(LS,ELS,'begin')
LSN = addlift(LS,ELS,'end')
addfilt(LS,ELS)

Description

LSN = addlift(LS,ELS) returns the new lifting scheme LSN obtained by appending the elementary lifting step ELS to the lifting scheme LS.

LSN = addlift(LS,ELS,'begin') prepends the specified elementary lifting step.

ELS is either a cell array (see lsinfo) 

{TYPEVAL, COEFS, MAX_DEG}

or a structure (see liftfilt) 

struct('type',TYPEVAL,'value',LPVAL)

with 

LPVAL = laurpoly(COEFS, MAX_DEG)

LSN = addlift(LS,ELS,'end') is equivalent to addfilt(LS,ELS).

If ELS is a sequence of elementary lifting steps, stored in a cell array or an array of structures, then each of the elementary lifting steps is added to LS.

For more information about lifting schemes, see lsinfo.

Examples

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Open Live Script

This example shows how to start with the Haar lifting scheme and add a primal lifting step.

LSbegin = liftwave('haar');

Display the lifting scheme.

displs(LSbegin);
LSbegin = {...                       
'd'             [ -1.00000000]  [0]  
'p'             [  0.50000000]  [0]  
[  1.41421356]  [  0.70710678]  []   
};

Create a primal lifting step.

pstep = { 'p', [-1 2 -1]/4 , 1 };

Add the primal lifting step.

LSend = addlift(LSbegin,pstep);

Display the final lifting scheme.

displs(LSend);
LSend = {...                                                 
'd'             [ -1.00000000]                          [0]  
'p'             [  0.50000000]                          [0]  
'p'             [ -0.25000000  0.50000000 -0.25000000]  [1]  
[  1.41421356]  [  0.70710678]                          []   
};

See Also

Introduced before R2006a

Wavelet Toolbox Documentation

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