Device and method for transforming digital signal
US6944349B1 · kind B1 · utility
23Cited by
9References
18Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 14, 2000 |
| Grant date | Sep 13, 2005 |
| Priority date | — |
| Expiry date | Apr 14, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F17/148
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a digital filtering device adopting wavelet transformation, a memory occupancy level of processed data is decreased. An image is divided into a plurality of first blocks each consisting of W pixels by H pixels. Wavelet transformation is performed on each of the first blocks in order to produce sub-frequency band blocks LL, LH, HL, an HH. Sub-frequency band blocks LL produced from the first blocks are grouped in order to produce second blocks having the same size as the first blocks. Wavelet transformation is performed again on the second blocks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.