Abstract
In this paper, we present a design of M-channel linear-phase paraunitary filter banks (LPPUFB), with filters of unequal lengths and same center of symmetry, (ULPPUFB) without using non-linear optimization algorithms. ULPPUFB can be viewed as generalized lapped orthogonal transforms (GenLOTs) with variable-length basis functions and are used in block transform-based image coding. ULPPUFB has long basis functions in order to avoid blocking artifacts, whereas it reserves short basis functions for high-frequency signal components like edges, thereby limiting ringing artifacts. The design of ULPPUFB has already been shown and can be expressed completely using a lattice structure. However, when it is used in image coding, the coding gain must be maximization, and then we must use non-linear optimization algorithms. When filter length or channel numbers are increased, non-linear optimization algorithms would necessitate an enormous amount of calculation. In this paper, we design each filter without using non-linear optimization, directly based on the compaction problem and implement ULPPUFB by changing these filters into lattice structures. Then, we show their validity.
| Original language | English |
|---|---|
| Title of host publication | IEEE Asia-Pacific Conference on Circuits and Systems, Proceedings, APCCAS |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Pages | 73-78 |
| Number of pages | 6 |
| Volume | 1 |
| ISBN (Print) | 0780376900 |
| DOIs | |
| Publication status | Published - 2002 |
| Event | Asia-Pacific Conference on Circuits and Systems, APCCAS 2002 - Denpasar, Bali, Indonesia Duration: 2002 Oct 28 → 2002 Oct 31 |
Other
| Other | Asia-Pacific Conference on Circuits and Systems, APCCAS 2002 |
|---|---|
| Country | Indonesia |
| City | Denpasar, Bali |
| Period | 02/10/28 → 02/10/31 |
Fingerprint
Keywords
- Algorithm design and analysis
- Band pass filters
- Channel bank filters
- Compaction
- Design optimization
- Discrete cosine transforms
- Filter bank
- Image coding
- Lattices
- Low pass filters
ASJC Scopus subject areas
- Electrical and Electronic Engineering
Cite this
Design of linear phase with unequal length paraunitary filter banks with suboptimal coding gain. / Ochi, A.; Kobayashi, Y.; Ikehara, Masaaki.
IEEE Asia-Pacific Conference on Circuits and Systems, Proceedings, APCCAS. Vol. 1 Institute of Electrical and Electronics Engineers Inc., 2002. p. 73-78 1114911.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Design of linear phase with unequal length paraunitary filter banks with suboptimal coding gain
AU - Ochi, A.
AU - Kobayashi, Y.
AU - Ikehara, Masaaki
PY - 2002
Y1 - 2002
N2 - In this paper, we present a design of M-channel linear-phase paraunitary filter banks (LPPUFB), with filters of unequal lengths and same center of symmetry, (ULPPUFB) without using non-linear optimization algorithms. ULPPUFB can be viewed as generalized lapped orthogonal transforms (GenLOTs) with variable-length basis functions and are used in block transform-based image coding. ULPPUFB has long basis functions in order to avoid blocking artifacts, whereas it reserves short basis functions for high-frequency signal components like edges, thereby limiting ringing artifacts. The design of ULPPUFB has already been shown and can be expressed completely using a lattice structure. However, when it is used in image coding, the coding gain must be maximization, and then we must use non-linear optimization algorithms. When filter length or channel numbers are increased, non-linear optimization algorithms would necessitate an enormous amount of calculation. In this paper, we design each filter without using non-linear optimization, directly based on the compaction problem and implement ULPPUFB by changing these filters into lattice structures. Then, we show their validity.
AB - In this paper, we present a design of M-channel linear-phase paraunitary filter banks (LPPUFB), with filters of unequal lengths and same center of symmetry, (ULPPUFB) without using non-linear optimization algorithms. ULPPUFB can be viewed as generalized lapped orthogonal transforms (GenLOTs) with variable-length basis functions and are used in block transform-based image coding. ULPPUFB has long basis functions in order to avoid blocking artifacts, whereas it reserves short basis functions for high-frequency signal components like edges, thereby limiting ringing artifacts. The design of ULPPUFB has already been shown and can be expressed completely using a lattice structure. However, when it is used in image coding, the coding gain must be maximization, and then we must use non-linear optimization algorithms. When filter length or channel numbers are increased, non-linear optimization algorithms would necessitate an enormous amount of calculation. In this paper, we design each filter without using non-linear optimization, directly based on the compaction problem and implement ULPPUFB by changing these filters into lattice structures. Then, we show their validity.
KW - Algorithm design and analysis
KW - Band pass filters
KW - Channel bank filters
KW - Compaction
KW - Design optimization
KW - Discrete cosine transforms
KW - Filter bank
KW - Image coding
KW - Lattices
KW - Low pass filters
UR - http://www.scopus.com/inward/record.url?scp=84948959210&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84948959210&partnerID=8YFLogxK
U2 - 10.1109/APCCAS.2002.1114911
DO - 10.1109/APCCAS.2002.1114911
M3 - Conference contribution
AN - SCOPUS:84948959210
SN - 0780376900
VL - 1
SP - 73
EP - 78
BT - IEEE Asia-Pacific Conference on Circuits and Systems, Proceedings, APCCAS
PB - Institute of Electrical and Electronics Engineers Inc.
ER -