Method for automatic detection of region of interest for digital x-ray detectors using a filtered histogram
US6118892A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1998 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | Nov 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30061
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for automatically forming a filtered subset of digital values from a first set of digital values corresponding to a plurality of picture elements representing a radiographic exposure of a subject for use in displaying a radiograph of said subject, the method comprising: (1) generating a first histogram of the first set of digital values; (2) generating an integral curve representing an integral of the first histogram; (3) identifying an inflection point and corresponding digital value V.sub.peak1 on the first histogram integral where the integral curve first changes slope in a direction decreasing from the highest digital value; (4) calculating a parameter V.sub.test =V.sub.peak1 -AR wherein AR represents an anatomical range of the subject; (5) spatially dividing the first set of digital values into multiple block subsets of digital values, each block subset comprising digital values from a neighborhood of pixels consisting of a predetermined number of picture elements; (6) constructing a subset histogram representing the frequency of occurrence of digital values within each block subset; (7) determining a low point of each block subset, BV.sub.low, corresponding to a pred…
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