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appcoef2

Two Dimension Approximation Coefficent Reconstruction

Calling Sequence

A=appcoef(c,s,wname,[N])
A=appcoef(c,s,Lo_R,Hi_R,[N])

Parameters

wname
: wavelet name, haar( "haar"), daubechies ("db1" to "db20"), coiflets ("coif1" to "coif5"), symlets ("sym2" to "sym20"), legendre ("leg1" to "leg9"), bathlets("bath4.0" to "bath4.15" and "bath6.0" to "bath6.15"), dmey ("dmey"), beyklin ("beylkin"), vaidyanathan ("vaidyanathan"), biorthogonal B-spline wavelets ("bior1.1" to "bior6.8"), "rbior1.1" to "rbior6.8"
A
: reconstructed approximation coefficient
Lo_R
: lowpass synthesis filter
Hi_R
: highpass syntheis filter
c
: coefficent array
s
: size array
N
: restruction level

Description

appcoef2 is for extraction or reconstruction of approximation coeffient at different level after a multiple level decompostion. Extension mode is stored as a global variable and could be changed with dwtmode. If N is omitted, maximum level approximation will be obtained.

Examples

x=rand(100,100);
[C,S]=wavedec2(x,3,'db2');
A2=appcoef2(C,S,'db2',2);

Authors

Roger Liu and Isaac Zhi

See Also


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