论文标题
从稀疏的顺序X射线测量木材原木的重建和分割
Reconstruction and segmentation from sparse sequential X-ray measurements of wood logs
论文作者
论文摘要
在工业应用中,通常在移动输送带上扫描对象。如果获得移动对象的切片2D计算机断层扫描(CT)测量值,我们称其为顺序扫描几何形状。在这种情况下,每个切片本身都没有足够的信息来重建有用的层析成像图像。因此,在这里,我们建议使用尺寸降低的卡尔曼过滤器来积累切片之间的信息,并允许足够准确的重建以进一步评估对象。此外,我们建议使用称为密度峰值的无监督聚类方法,以在重建对象的内部结构中执行分割和点密度异常。我们在概念研究证明中评估了该方法,用于将木材记录扫描应用于工业锯工艺,该过程的目标是在木材数目中发现异常,以允许最佳的锯切模式。从实验测量数据中评估了重建和分割质量,以实验性测量数据严重采样X测量。结果清楚地表明,通过使用降低尺寸的卡尔曼过滤器允许可靠地获取分段日志,可以改善重建质量。
In industrial applications, it is common to scan objects on a moving conveyor belt. If slice-wise 2D computed tomography (CT) measurements of the moving object are obtained we call it a sequential scanning geometry. In this case, each slice on its own does not carry sufficient information to reconstruct a useful tomographic image. Thus, here we propose the use of a Dimension reduced Kalman Filter to accumulate information between slices and allow for sufficiently accurate reconstructions for further assessment of the object. Additionally, we propose to use an unsupervised clustering approach known as Density Peak Advanced, to perform a segmentation and spot density anomalies in the internal structure of the reconstructed objects. We evaluate the method in a proof of concept study for the application of wood log scanning for the industrial sawing process, where the goal is to spot anomalies within the wood log to allow for optimal sawing patterns. Reconstruction and segmentation quality are evaluated from experimental measurement data for various scenarios of severely undersampled X-measurements. Results show clearly that an improvement in reconstruction quality can be obtained by employing the Dimension reduced Kalman Filter allowing to robustly obtain the segmented logs.