3D Inspection by Registration of CT and Dual X-ray Images

Recently, computed tomography (CT) has been used for non-destructive inspection. The rapid development of CT scanning hardware and software, CT became one of the major inspection solutions for non-destructive inspection. Because non-destructive inspection does not damage the product, it is beneficial in time and money in product quality testing. Most of all, this non-destructive inspection is important if the prod-uct should be preserved the original condition. CT scanning can detect porosities, voids, flaws, inclusions, and inside cast-ings in three-dimension. However, because 3D CT scanning takes much time, it can be used for only the inspection of sam-ples. To overcome this problem, we propose a new method to inspect all the products by using dual X-ray imaging. The dual X-ray or stereo X-ray imaging uses two X-ray images from the orthogonal views. Accurate calibration of 2D-3D registration is also required. Once the 3D CT scan of a master is registered to the dual X-ray images of a sample, the matching score is com-puted to inspect the sample.