Method and apparatus for processing a high definition image to provide a relatively lower definition image using both discrete cosine transforms and wavelet transforms
US6141457A · kind A · utility
6Cited by
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21Claims
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Key dates
| Filing date | Dec 31, 1997 |
| Grant date | Oct 31, 2000 |
| 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 processing a high definition image using both an inverse discrete cosine transform (IDCT) and an inverse discrete wavelet transform (IDWT) to provide a relatively lower definition image is provided. Image data encoded with a discrete cosine transform (DCT) is decoded using both an IDCT and an IDWT to generate IDCT processed image data and IDWT reduced image data. The IDCT processed image data and the IDWT reduced image data are combined to generate reduced image data that has a relatively lower definition than the image data and a relatively higher definition than the IDWT reduced image data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.