Combined reconstruction and edge detection in dimensioning

Combined reconstruction and edge detection in dimensioning
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尺寸标注中的组合重建和边缘检测

DOI:
10.1088/0957-0233/24/12/125601
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发表时间:
2013
影响因子:
2.4
通讯作者:
Schorr
Schorr
中科院分区:
工程技术3区
文献类型:
--
作者:
Schorr

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断层扫描检查的结果是一系列二维(2D)或三维(3D)图像,这是诊断的基础。这些图像的自动评估在无损检测中是相当普遍的,在医学分析中,这可能在未来的部分情况下。通常,图像重建和图像评价这两个任务是分开处理的。本文描述了一种将这两个步骤结合在一起的方法。正如Louis (2008 SIAM J. Imaging Sci. 1 188-208)的比较所示,通过联合优化这两个步骤,结果远优于单独处理这两个任务。通过构造相应的重构滤波器,算法属于滤波后的反向投影类型,因此计算时间与密度本身的重构基本相同。研究了扇形几何图形的x射线层析成像中使用平面检测器和边缘检测的重建问题。然后将该方法扩展到具有feldkamp型核的滤波反投影,用于三维锥束情况。我们计算了一些特殊的重构核,这些核也适用于非常嘈杂的实际数据,并给出了实测数据的数值例子。
The result of tomographic examination is a series of two-dimensional (2D) or three-dimensional (3D) images, on which a diagnosis is based. Automatic evaluations of these images are rather common in nondestructive testing, in medical analysis this may partially be the case in the future. Typically the two tasks, image reconstruction and image evaluation, are treated separately. This paper describes an approach where the two steps are combined in just one method. By joint optimization of the two steps, the results are much superior to the separate treatment of the two tasks, as the comparisons in Louis (2008 SIAM J. Imaging Sci. 1 188–208) show. By constructing corresponding reconstruction filters, the algorithms are of filtered backprojection type, hence the computing time essentially remains the same as for the reconstruction of the density itself. We consider the reconstruction problem in x-ray tomography for the fan-beam geometry with flat detectors and edge detection. This method is then extended to filtered backprojection with Feldkamp-type kernels for the 3D cone-beam case. We calculate special reconstruction kernels which work also in the case of very noisy real data, and we present numerical examples from the measured data.
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发表时间: 2008-01-01
影响因子: 1.9
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DOI: --
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期刊: Inverse Problems
影响因子: 2.1
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DOI: --
发表时间: 2010
期刊:
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作者:
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通讯作者: A. Louis