Method of automatic determination of the contrast and brightness of a digital radiographic image
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United States of America Patent
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Apr 6, 2004
Grant Date -
N/A
app pub date -
Nov 29, 1999
filing date -
Nov 27, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The method comprises a histogram of the radiographed image, i.e., a real histogram, a mathematical model of the image chain and the object obtained by calibration. The mathematical model of the image chain and the object and a set of parameters of acquisition, of the detector, of the positioner and of the object are used to determine two values of gray level, gray min and gray max, delimiting a useful zone and the part below gray min and the part above gray max are suppressed in the real histogram, i.e., a limited histogram. A set of rules is applied to the limited histogram in order to determine the level of brightness (WL) and the contrast (WW) is obtained from the brightness and possibly from one or more parameters selected by the user or fixed a priori.
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