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 |
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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 |
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Country/Territory | Indonesia |
City | Denpasar, Bali |
Period | 02/10/28 → 02/10/31 |
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