Since these numbers are deposited onto the film material, approximately 10,000 characters needed to be trained and saved to an OCR database using Halcon.Īfter the film is identified, the system must also detect which type of dosimeter cassette has been used to house the film. The optical density is converted into a photon dose using a linear algebraic function to calculate the x-ray dose to which the film was exposed.Įvery film reading must be correlated with the unique specimen number associated with each badge. Any lens vignetting and variations caused by pixel-to-pixel sensitivity variation is eliminated by flat-field correction. Because the background lighting is not homogenous, shading correction is performed to eliminate any lighting variation. To increase the dynamic range of the gray-level image of the film, two images with different exposure times are computed and combined into a high-dynamic-range image. The densitometer measures the brightness at each of seven points on the film in high precision and is used to calibrate the camera measurement for every film image. As each film moves under the camera system's field of view, this presence and orientation task is computed using Halcon's shape-based matching algorithm.īoth the camera and a densitometer are used to measure the optical density of the film. Resulting high-dynamic-range images are then displayed using an ATIFire GL V3600 graphic board from AMD (Sunnyvale, CA, USA) on a FlexScan MX 190 S display from Eizo (Ishikawa, Japan).īefore the optical density of the film is measured, its presence and orientation must be determined.
#Xray vision pictures software#
Data from this camera is then transferred to a PC and processed using Halcon 9.0 from MVTec Software (Munich, Germany). To analyze each film, a DX4 285 FireWire camera from Kappa optronics (Gleichen, Germany) is mounted on a bellows stage above the film reel. This coil is then mounted on the vision system so that each film element can be inspected automatically. To analyze the x-ray exposure of film badges, the film from each dosimeter badge is first mounted on a plastic adhesive foil, which is wound into a coil.
This coil is then mounted on the vision system so that each film element can be inspected automatically (see figure). The film from each dosimeter badge is first mounted on a plastic adhesive foil, which is wound into a coil. To speed this inspection and increase reliability, the Helmholtz-Zentrum has developed a machine-vision system to automatically inspect these films. Previously these 120,000 film badges were evaluated manually. One of which, the Helmholtz-Zentrum (Munich, Germany) is responsible for the analysis of approximately 120,000 film badge dosimeters a month. Only a handful of institutions are qualified to perform such tasks. In Germany, the inspection of x-ray dosimeters worn by people who may be exposed to radiation is a governmental responsibility.
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