Processing of digital images
US7110604B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 2002 |
| Grant date | Sep 19, 2006 |
| Priority date | — |
| Expiry date | Jun 9, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/19
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatuses for identifying objects in a digital image include a thresholding unit and a threshold calculation unit. The thresholding unit is designed to receive the digital image and compare the luminance values of the digital image with threshold values of a threshold matrix in order to create a binary image on the basis of the comparison. The threshold calculation unit is designed to estimate, on the basis of a first and second division of a reference image which corresponds to the digital image into first and second subareas, a background luminance value for each first subarea and an object luminance value for each second subarea. The apparatuses and the methods permit quick and memory-efficient identification of the individual objects, even if the digital image contains variation in the luminance and/or sharpness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.