Adaptive error diffusion with improved edge and sharpness perception
US6671068B1 · kind B1 · utility
93Cited by
23References
16Claims
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Key dates
| Filing date | Sep 30, 1999 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Sep 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4053
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for adaptive error diffusion. The method includes the steps of receiving input image data, detecting edges in the input image data, and then adding noise to the input image data depending upon results of said edge detection. The amount of noise is higher for pixels with higher edge content, unless the pixel is on an edge that is already sharp. Once the noise is added the method performs error diffusion on the noise-enhanced image data and it produces output image data. Alternatively, noise can be added to the thresholding portion of the error diffusion process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.