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Wavelab Toolbox >> Wavelab Toolbox > 2-d Wavelet- and Cosine- Packet Tools > DownQuad

DownQuad

Split 2-d image into 4 subbands

Calling Sequence

q = DownQuad(Quad,qmf,xbit,ybit)

Parameters

Inputs:

Quad :

Quadlet to be split into four subbands

qmf :

orthogonal quadrature mirror filter

xbit :

x-position of quadlet in 2-d freq plane

ybit :

y-position of quadlet in 2-d freq plane

Outputs:

q :

quadlet after splitting

Description

A 2-d signal is split into four subbands: (Lo_x,Lo_y), (Lo_x,Hi_y), (Hi_x,Lo_y), (Hi_x,Hi_y).

This routine is called by other, higher-level WaveLab functions and may not be useful for many users.

See also

Authors

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