Exposure compensation for digital radiography systems using spatial look-up tables
US6205198A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1998 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Sep 16, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/583
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A digital x-ray image (600) is divided (802) into regions (602), (604) according to a selected (800) exposure compensation profile. Each region (602),(604) includes pixel values indicative of gray-scale levels in that region. The pixel values are used to index entries in one of a plurality of spatial LUTs (312a-n) assigned (804) to that region. Entries in the selected spatial LUT (312a-n) contain new pixel values indicative of a transform (806) on the original pixel values used to index the spatial LUT (312a-n). Original pixel values are replaced (808) with corresponding pixel values from the spatial LUT (312a-n). Each region of the x-ray image (600) needing compensation is transformed (806), in turn, until the entire image (600) is processed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.