Differential pulse code modulation image compression with varying levels of quantizers
US6771830B2 · kind B2 · utility
38Cited by
11References
8Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 12, 2001 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Jun 4, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for encoding a digital image is disclosed. A difference is calculated between a first sample from a current scan line and a corresponding second sample from a previous scan line. A quantization table level is selected from a quantization table that includes at least one level, and information identifying the selected level is placed into an information stream. A quantizer is selected from the quantization table level based on the calculated difference and information corresponding to the selected quantizer is place into the information stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.