Method for detection of elements of interest in a digital radiographic image
First Claim
1. 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.
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Abstract
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 a first calibration phase in which the performances of the detection system are established. For such purpose, a calibration curve with several dimensions is determined by means of a mathematical model of the acquisition chain and object, in order to express a false positive probability as a function of a set of parameters corresponding to the acquisition chain and object. In the course of a second phase of use, a false positive probability value is determined for each pixel of the image. One then selects among the pixels of the digital radiographic image acquired those whose probability value obtained satisfies a predetermined criterion.
34 Citations
42 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification