appcoef

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

l

: length array

N

: restruction level

Description

appcoef 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(1,100); [c,l]=wavedec(x,3,'db2'); A2=appcoef(c,l,'db2',2);

Authors

Roger Liu and Isaac Zhi

See Also

• wavedec
• waverec
• detcoef