Sharpness estimation in document and scene images
US9087262B2 · kind B2 · utility
2Cited by
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15Claims
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Key dates
| Filing date | Nov 10, 2011 |
| Grant date | Jul 21, 2015 |
| Priority date | — |
| Expiry date | May 11, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Systems and methods described herein are directed to estimating the sharpness of images or photos such as document pages or scenes. The systems and methods are based on calculating a difference in grayscale values between pixels at an edge of an image. The differences may be accomplished by taking a slope of grayscale values between two pixels at an edge window, and estimating the edge sharpness based on the slope, multiple slopes, or differences in the slopes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.