TY - GEN
T1 - A generalized lapped transform with unequal length filters based on first-order linear-phase filter banks
AU - Yoshida, Taichi
AU - Tanaka, Yuichi
AU - Ikehara, Masaaki
PY - 2007/12/1
Y1 - 2007/12/1
N2 - In this paper, we propose design methods for biorthogonal linear-phase filter banks (BOLPFBs) which have unequal length filters in their synthesis banks or in their both (analysis and synthesis) banks based on first-order linear-phase filter banks (FOLPFBs). First, we indicate that the building blocks in FOLPFBs can be used as those in variable-order LPFBs (VOLPFBs). Second, we propose a VOLPFB which have unequal length filters in its synthesis bank (UVLPFB). Long highpass filters of a synthesis bank often generate the ringing artifacts. Ringing artifacts are a main disadvantage in image coding based on FOLPFBs. Since UVLPFBs have long lowpass filters and short highpass filters in their synthesis bank, they can reduce the ringing artifacts as well as approximate smooth regions well.
AB - In this paper, we propose design methods for biorthogonal linear-phase filter banks (BOLPFBs) which have unequal length filters in their synthesis banks or in their both (analysis and synthesis) banks based on first-order linear-phase filter banks (FOLPFBs). First, we indicate that the building blocks in FOLPFBs can be used as those in variable-order LPFBs (VOLPFBs). Second, we propose a VOLPFB which have unequal length filters in its synthesis bank (UVLPFB). Long highpass filters of a synthesis bank often generate the ringing artifacts. Ringing artifacts are a main disadvantage in image coding based on FOLPFBs. Since UVLPFBs have long lowpass filters and short highpass filters in their synthesis bank, they can reduce the ringing artifacts as well as approximate smooth regions well.
KW - Biorthogonal filter banks
KW - First-order linear-phase filter banks
KW - Image coding
KW - Unequal length filter banks
UR - http://www.scopus.com/inward/record.url?scp=50249098107&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=50249098107&partnerID=8YFLogxK
U2 - 10.1109/ACSSC.2007.4487389
DO - 10.1109/ACSSC.2007.4487389
M3 - Conference contribution
AN - SCOPUS:50249098107
SN - 9781424421107
T3 - Conference Record - Asilomar Conference on Signals, Systems and Computers
SP - 1083
EP - 1087
BT - Conference Record of the 41st Asilomar Conference on Signals, Systems and Computers, ACSSC
T2 - 41st Asilomar Conference on Signals, Systems and Computers, ACSSC
Y2 - 4 November 2007 through 7 November 2007
ER -