Patent ID: 6542628
Filing Date: 2003-04-01
Classification: G06T

Abstract:
A method of improved detection of elements of interest by means of a detection system in a digital radiographic image of an object, acquired on an acquisition chain, comprising the steps of:a) a calibration phase, in which: determining from a mathematical model of the acquisition chain and object a plurality of images corresponding to a plurality of gray input levels representing a set of parameters of the object and a set of parameters of the acquisition chain variable over a predetermined range of values; elaborating, from the system of detection and plurality of images, a mathematical model of detection giving a theoretical number of elements detected as a function of a set of parameters of the acquisition chain, a useful output signal of the detection system and a gray background level of the image considered, representing one of the sets of parameters of the object; b) a phase of use in which: the detection system is applied on the digital radiographic image; for each elementary zone of that image, one introduces as input data in the mathematical model of detection the useful output signal of the detection system, a set of parameters of the acquisition chain taken among the predetermined values and used to obtain said digital radiographic image, and a gray background level calculated on said digital radiographic image, so as to determine a theoretical number of elements detected; selecting among the elementary zones of the digital radiographic image acquired those whose theoretical number of detected elements satisfies a predetermined criterion.