关于DR检测图像拼接技术的探讨

Discussion on Image Mosaic Tested by DR

DR成像技术的众多优点令其在目前的工业检测中应用广泛。针对大型工件,由于成像板的尺寸限制,因此需要使用专用的图像拼接软件,以完成整个被检工件的完整射线检测图像显示。介绍了在使用多自由度射线检测系统时,当分别在水平与垂直方向逐步透照大型工件时,产生的图像拼接问题。检测发现,工件转台水平偏移透照方式对图像拼接质量没有影响,但是转台垂直偏移透照时会导致图像拼接质量不佳。分析出在两个方向上拼接效果不同的原因在于垂直方向上的影像放大倍数不同,提出为了实现对大型工件的有效检测,射线检测系统设计时应该采用面板探测器的水平和垂直运动,而非工件转台运动的建议。

DR imaging technology was used widely in modern industry for its many advantages. For large workpiece testing, due to the size restrictions of imaging plate, an image mosaic software was required to illustrate the whole radiographic testing image of the workpiece. When radiographic testing was carried out with a multi freedom degree system, an image mosaic problem was taken on the horizontal and vertical direction of the image. Testing on-site found that, the turntable moving direction on horizontal was no any effect to the switching image quality, but the vertical moving of turntable would lead to poor quality of image stitching. The analyzing results showed that it was caused by the magnification difference on the vertical direction. Therefore, in order to achieve an effective large-scale workpiece testing, the radiographic testing system should be designed with panel detector moving in horizontal and vertical direction, and not being the turntable movement.