Method and apparatus for converting a high definition image to a relatively lower definition image using wavelet transforms
US6275616A · kind A · utility
7Cited by
10References
3Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 31, 1997 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Dec 31, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/63
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and an apparatus for converting a high definition image to a relatively lower definition image is provided. Image data encoded with a discrete cosine transform (DCT) is decoded using an inverse wavelet transform (IDWT). A fast inverse discrete wavelet transform (FIDWT) is also provided that reduces the number of multiplication operations relative to the IDWT. Image data is also encoded using a discrete wavelet transform (DWT) and then decoded using an (IDWT).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.