Image scaling in the compressed domain
US7050656B2 · kind B2 · utility
19Cited by
7References
16Claims
0Family size
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Key dates
| Filing date | Dec 11, 2002 |
| Grant date | May 23, 2006 |
| Priority date | — |
| Expiry date | Nov 12, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T3/4023
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An efficient compressed-domain-based algorithm that works by combining the IDCT and pixel-domain averaging into a single compressed domain operation, where a part of the cost of even this simplified operation can be absorbed into the de-quantization process. The original image need not be decompressed fully, only to the point of extracting the transform coefficients. Compressed-domain scaling for all scales k/8 for 1≦k≦8, including ⅜, ⅝, ¾, ⅞, is provided. By chaining multiple operations, any scale factors of the form k1k2 . . . kl/8l for integers ki's in the range [1,7] can be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.