Quad-tree embedded image compression and decompression method and apparatus
US6356665B1 · kind B1 · utility
43Cited by
17References
25Claims
0Family size
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Key dates
| Filing date | Dec 9, 1998 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Dec 9, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/96
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A quad-tree embedded image coding technique is used in combination with a bit-plane encoding technique to provide an efficient and low complexity embedded image coding system. A simple quad-tree method identifies coefficients as significant, insignificant, or refinement at each successive quantization level. The quad-tree technique is used instead of the zero-tree or hierarchical tree used in previous encoders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.