Image coding method using visual optimization
US6658162B1 · kind B1 · utility
34Cited by
8References
10Claims
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Key dates
| Filing date | Oct 13, 1999 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Oct 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for compressing and decompressing image information. An encoder receives initial image information and transforms said initial information using a linear transform to produce coefficients. These are then locally normalized using a neighborhood masking weighting factor, quantized and coded to result in a compressed bit stream. The compressed bit stream is received at a decoder and an inverse process is applied to reconstruct said image data from the compressed bitstream. Alternatively, the neighborhood-masking factor can be applied after quantization in the rate-distortion optimization process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.