what is primal ELS in lifting scheme?what does this commands do

% Add a primal ELS to the lifting scheme. els = {'p',[-0.125 0.125],0}; lsnew = addlift(lshaar,els);

 % Perform LWT at level 1 of a simple image.
 x = reshape(1:16,4,4);
 [cA1,cH1,cV1,cD1] = lwt2(double(I),lsnew);

Answer 1

[Wayne King]

This is essentially the same question you asked here and I answered:

http://www.mathworks.com/matlabcentral/answers/73763-how-lifting-wavelet-transform-used-to-enhance-the-spatial-resolution-of-the-image-explain-the-basic

By adding a primal step or dual step you are simply changing the wavelet transform.

Lifting enables you to start with a very simple wavelet transform and then lift the wavelet and scaling filters to obtain a transform with the properties you desire.