Method and apparatus for edge detection
US6862368B1 · kind B1 · utility
10Cited by
11References
33Claims
0Family size
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Key dates
| Filing date | Aug 16, 2000 |
| Grant date | Mar 1, 2005 |
| Priority date | — |
| Expiry date | May 22, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20192
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An edge detection technique combines a low-pass second derivative of an image signal, a low-pass first derivative of the image signal, and an estimation of edge frequency. The edge frequency estimation is preferably based on a ratio of a third to a first low-pass derivative of image signal. The image signal is preferably a luminance signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.