Autofocus based on differential measurements
US9832365B2 · kind B2 · utility
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10References
16Claims
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Key dates
| Filing date | Jan 24, 2017 |
| Grant date | Nov 28, 2017 |
| Priority date | — |
| Expiry date | Jan 24, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to the field of digital pathology and in particular to whole slide scanners. A tilted autofocus image sensor images an oblique cross-section of the slide. For focusing multiple sequential overlapping images, which have been taken by the tilted sensor, are compared. The axial position of the tissue layer can be determined from the polar error signal resulting from this differential measurement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.