Method for contrast-enhancement of digital portal images
US6836570B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2001 |
| Grant date | Dec 28, 2004 |
| Priority date | — |
| Expiry date | Jun 24, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30004
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for enhancing the image contrast of digital portal images for presentation on an output medium comprising: providing an input digital portal image having radiation and collimation fields; locating and labeling said radiation and collimation fields to produce labeled radiation and labeled collimation field images; designing a tone scale curve to display the image inside the radiation field using the full dynamic range of the output medium; applying said tone scale curve to the input digital portal image to produce a tone-scaled radiation field image; designing a tone scale curve to display the image outside the radiation field using the full dynamic range of said output medium; applying said tone scale curve to the input digital portal image to produce a tone-scaled collimation field image; enhancing the image contrast of said tone-scaled radiation field image and said tone-scaled collimation field image; combining said enhanced images using the labeled radiation and collimation field images; and black-surrounding the collimation field to produce a contrast enhancement output image which can be presented on said output medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.