Nonlinear edge-enhancement filter
US6873741B2 · kind B2 · utility
55Cited by
9References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 10, 2002 |
| Grant date | Mar 29, 2005 |
| Priority date | — |
| Expiry date | Sep 18, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20192
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for digital data array edge enhancement are disclosed. A local data window containing a data sample s is selected. Minimum and maximum sample values, max and min, are located within the window, and an edge deflection value ed is defined to have a value between max and min. A diffusion quantity is then calculated to move the value of s towards max, if s is greater than ed, or towards min, if s is smaller than ed. This approach has advantages over gradient-based edge-enhancement, including simplicity, convergence speed, and stability.
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