Design and Performance Analysis of Linear Phase Para-UnitaryMBand Filter Banks for Image Coding
✍ Scribed by Chang Woo Lee; Jong Won Kim; Sang Uk Lee
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 190 KB
- Volume
- 10
- Category
- Article
- ISSN
- 1047-3203
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✦ Synopsis
This paper presents the optimal design and performance analysis of the linear phase paraunitary (LPPU) M band filter banks in the frame of vector quantized image coding. First, by maximizing the unified coding gain, which is a function of intra-band correlation, as well as inter-band energy compaction, the LPPU M band filter banks for the general factorization form are designed. Then, the image coding performances of the LPPU M band filter banks, such as the inter-band energy compaction, the intraband correlation, and the average entropy are discussed. It is shown asymptotically that, as the filter length increases, the unified coding gain for the LPPU M band filter bank improves and the unified coding gain of the LPPU 4 band filter bank approaches very closely that of the LPPU 8 band filter bank. This observation is also verified by extensive computer simulation on the real images. In addition, the benefit of the direct M band decomposition, based on the LPPU M band filter bank, over the tree structure decomposition is discussed, by showing the comparable coding performance and the reduced computational complexity.