Name
Abstract | ||
|---|---|---|
It has been well established that critically sampled boundary pre-/postfiltering operators can improve the coding efficiency and mitigate blocking artifacts in traditional discrete cosine transform-based block coders at low bit rates. In these systems, both the prefilter and the postfilter are square matrices. This paper proposes to use undersampled boundary pre- and postfiltering modules, where the pre-/postfilters are rectangular matrices. Specifically, the prefilter is a "fat" matrix, while the postfilter is a "tall" one. In this way, the size of the prefiltered image is smaller than that of the original input image, which leads to improved compression performance and reduced computational complexities at low bit rates. The design and VLSI-friendly implementation of the undersampled pre-/postfilters are derived. Their relations to lapped transforms and filter banks are also presented. Two design examples are also included to demonstrate the validity of the theory. Furthermore, image coding results indicate that the proposed undersampled pre-/postfiltering systems yield excellent and stable performance in low bit-rate image coding. |
Year | DOI | Venue |
|---|---|---|
2007 | 10.1109/TIP.2006.888344 | IEEE Transactions on Image Processing |
Keywords | Field | DocType |
coding efficiency,prefiltered image,low bit-rate image coding,interpolation,postfiltering module,index terms—discrete cosine transform dct,downsampling,undersampled pre,low bit-rate dct-based block,pre-/postfiltering,undersampled boundary pre,boundary pre,low bit rate,low bit-rate coding,undersampled.,original input image,pre-/postpro- cessing,proposed undersampled pre,indexing terms,discrete cosine transform,computational complexity,block codes,lapped transform,transform coding,filter bank,square matrices | Signal processing,Algorithmic efficiency,Pattern recognition,Filter bank,Discrete cosine transform,Block code,Transform coding,Image processing,Artificial intelligence,Upsampling,Mathematics | Journal |
Volume | Issue | ISSN |
16 | 2 | 1057-7149 |
Citations | PageRank | References |
7 | 0.67 | 18 |
Authors | ||
5 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Lu Gan | 1 | 324 | 25.46 |
| Chengjie Tu | 2 | 76 | 8.46 |
| Jie Liang | 3 | 707 | 80.89 |
| T. D. Tran | 4 | 179 | 20.04 |
| Kai-Kuang Ma | 5 | 2309 | 180.29 |