Last Updated:2022/12/23
Sentence
Such
symmetric
quincunx
tight
framelets
are
associated
with
quincunx
tight
framelet
filter
banks
a;b_1,b_2,b_3
having
increasing
orders
of
vanishing
moments
and
enjoying
the
additional
double
canonical
properties:
b_1(k_1,k_2)=(-1)a(1-k_1,-k_2),b_3(k_1,k_2)=(-1)b_2(1-k_1,-k_2).
For
a
low-pass
filter
a
which
is
not
a
quincunx
orthonormal
wavelet
filter,
we
show
that
a
quincunx
tight
framelet
filter
bank
a;b_1,…,b_L
with
b_1
taking
the
above
canonical
form
must
have
L>3
high-pass
filters.
Quizzes for review
Such symmetric quincunx tight framelets are associated with quincunx tight framelet filter banks a;b_1,b_2,b_3 having increasing orders of vanishing moments and enjoying the additional double canonical properties: b_1(k_1,k_2)=(-1)a(1-k_1,-k_2),b_3(k_1,k_2)=(-1)b_2(1-k_1,-k_2). For a low-pass filter a which is not a quincunx orthonormal wavelet filter, we show that a quincunx tight framelet filter bank a;b_1,…,b_L with b_1 taking the above canonical form must have L>3 high-pass filters.
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