Strategies for producing quantized image information
US7308151B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2006 |
| Grant date | Dec 11, 2007 |
| Priority date | — |
| Expiry date | Mar 14, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4053
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Strategies are set forth herein for quantizing and dithering original image information to produce quantized image information. According to one exemplary implementation, the strategies involve: quantizing a sum that combines an original value taken from the original image information, a noise value, and an error term, to produce a quantized value; and calculating an error term for a subsequent quantizing operation by computing a difference between the quantized value and the original value. By virtue of his process, the strategies essentially add noise information to the quantization process, not the original image information, which results in quantized image information having reduced artifacts. The strategies can be used in conjunction with the Floyd-Steinberg error dispersion algorithm. According to another feature, the noise value is computed using a random number generator having a long repeat period, which further reduces artifacts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.