Image-adaptive quantization for JPEG compression
US7580579B2 · kind B2 · utility
7Cited by
7References
37Claims
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Key dates
| Filing date | Dec 20, 2004 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Jun 20, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a method of digital image compression, the spatial frequency content of a digital image is characterized using a relatively sparse sampling of data blocks from the image, and a quantization table is constructed based on the characterization of the spatial frequency content.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.