Metrological analysis of the three-dimensional reconstruction based on close-range photogrammetry and the fusion of long-wave infrared and visible-light images

Metrological analysis of the three-dimensional reconstruction based on close-range photogrammetry and the fusion of long-wave infrared and visible-light images
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基于近景摄影测量和长波红外与可见光图像融合的三维重建计量分析

DOI:
10.1088/1361-6501/abb273
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发表时间:
2020
影响因子:
2.4
通讯作者:
T. L. F. C.
T. L. F. C.
中科院分区:
工程技术3区
文献类型:
--
作者:
de Oliveira;B. C. F;Marcellino;da Rosa;P. A. A;T. L. F. C.

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这项工作提出了统计评估与融合的长波长红外(LWIR)和可见光(VL)图像的三维重建的性能。图像融合过程基本上是基于二维小波变换和两个像素级的融合规则:最大强度水平,在作者以前的工作中提出的,和一个新的融合规则,它取代VL信息与LWIR信息在图像上的被测对象的区域。采用基于点三角剖分的方法重建了一个半透明立方体,并将其尺寸测量值作为评价标准。结果表明,融合后的图像对比度更高,但也有更多的伪影。融合程序生成了更密集的重建,至少多出34.83%的点。考虑到融合结果,仅用可见光图像重建的测量偏差最大减少89.31%,但不确定性至少增加47.25%。新的融合规则提供了最好的结果,在密集的云中有更多的点和更低的不确定性。这项工作是很重要的,提供了一个计量学上可行的替代方案,在可见光谱中的低对比度或纹理信息差的情况下,物体的三维重建,并在其中没有目标可以应用到检查的部分。
This work proposes evaluating statistically the metrological performance of three-dimensional reconstructions built with fused long-wavelength infrared (LWIR) and visible-light (VL) images. The image fusion procedure was essentially based on two-dimensional wavelet transform and two pixel-level fusion rules: the maximum intensity level, presented in a previous work of the authors, and a new fusion rule, which replaces the VL information with the LWIR information in the region of the measured object on the images. The reconstructions of a translucent cube were performed with a point triangulation-based procedure and its dimension measurements were employed as evaluation criteria. The results show that the fused images have more contrast but also more artifacts. The fusion procedures generated denser reconstructions with at least 34.83% more points. Considering the metrological result, reconstructions with only visible-light images resulted in maximal 89.31% less measurement bias but at least 47.25% more uncertainty than the fusion ones. The new fusion rule provided the best results, with more points in the dense cloud and lower uncertainty. The work is important to provide a metrologically viable alternative for three-dimensional reconstruction of objects in situations of low contrast or poor texture information in the visible spectrum, and in which no target can be applied to the inspected part.
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