Improving X-Ray Assessment of Internal Defects Using Filters for Digital Image Processing

Non-destructive testing (NDT) is an essential solution for assessing the integrity of industrial parts without compromising their utility.In this study, the use of X-ray radiographic technique for the evaluation of internal defects in lightweight alloys was investigated, with emphasis on the application of image processing filters.In particular, the performance of the Flash!Filter, a tool integrated into the Rhythm Review software designed to reduce noise and improve contrast was implicated.The study focused on AlSi12(Cu) alloy die-casting parts with wall thicknesses between 3.5 and 13.0 mm.The results showed that the use of the Flash!Filter allows more accurate detection of porosity and cold fill defects, ensuring correct classification according to ASTM E-505.The images processed with this filter showed a significant reduction in background noise and an increase in contrast compared to the raw images, contributing to a more detailed assessment of discontinuities.In addition, the application of the Laplacian filter highlighted the boundaries of the defects by analyzing sudden density changes.