Method and apparatus for thresholding images in pipeline fashion utilizing aging functions
US5553167A · kind A · utility
5Cited by
17References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 3, 1994 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | May 3, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10851
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An adaptive thresholding filter generates multiple threshold values for use in thresholding the multi-bit pixels of a gray-scale input image. Each threshold value is based on a current white reference value and a current black reference value. The current white reference value is selected based on a comparison of the current image pixel to a white reference comparator value generated by applying a white reference aging function to a prior white reference value. The current black reference value is selected analogously using a black reference comparator value and a black reference aging function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.