Micromorphology of gold jewels: a novel algorithm for 3D reconstruction and its quality assessment

机译：黄金珠宝的微观形态：一种用于3D重建的新算法及其质量评估

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The development of a reliable algorithm for 3D reconstruction of jewel surfaces and the relative accuracy evaluation, are the main issues of this paper. They rely on the estimation of the depth and 3D shape of an object from a sequence of images taken at different focus settings (shape from focus). Assuming the focal plane be identified by the best local sharpness, it turns out that the criterion for sharpness evaluation is crucial for obtaining an accurate 3D reconstruction. We present for the first time a novel algorithm for sharpness evaluation, which is based on a particular combination of sum of square differences (SSD). The images processed with SSD have been captured using a novel homemade microscope prototype. The implementation of this technique allows computing the best-focus map (and, consequently, image) from the whole set of images. The assessment of the 3D reconstruction quality has been carried out by considering the structural similarity index (SSIM), since thanks to its effectiveness in measuring the quality of natural images distorted by a large variety of biases. Hence, the novel algorithm has been applied to study micro-morphological features of a modern replica of an Etruscan gold jewel. The granulation ornament on the jewel has been characterized through a geometrical model which can be introduced to illustrate the grains solder quality. The developed geometrical model has been used to analyze also the granulation on an original Etruscan bauletto earring.

机译：珠宝表面3D重建的可靠算法的开发和相对精度评估是本文的主要问题。它们依赖于在不同焦点设置下拍摄的一系列图像（焦点形成的形状）对物体深度和3D形状的估计。假设焦平面由最佳局部清晰度识别，事实证明，清晰度评估标准对于获得准确的3D重建至关重要。我们首次提出了一种新颖的锐度评估算法，该算法基于平方差和（SSD）的特定组合。使用新型自制显微镜原型捕获了使用SSD进行处理的图像。该技术的实现允许从整个图像集中计算最佳聚焦图（因此，图像）。 3D重建质量的评估已通过考虑结构相似性指数（SSIM）进行，这是由于3D重建质量可有效地测量由于各种偏差而失真的自然图像的质量。因此，该新算法已被用于研究伊特鲁里亚金珠宝的现代复制品的微观形态特征。珠宝上的造粒装饰物已经通过几何模型进行了表征，可以引入该模型来说明颗粒的焊料质量。所开发的几何模型已用于分析原始Etruscan Bauletto耳环上的颗粒。

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《Optics for arts, architecture, and archaeology IV》|2013年|87900B.1-87900B.11|共11页
会议地点 Munich(DE)
作者
I. Cacciari; A. A. Mencaglia; S. Siano;
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作者单位

Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, 50019 Sesto Fiorentino (Fi), Italy;

Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, 50019 Sesto Fiorentino (Fi), Italy;

Istituto di Fisica Applicata 'Nello Carrara', Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, 50019 Sesto Fiorentino (Fi), Italy;

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正文语种 eng
中图分类
关键词
3D; digital microscopy; SFF; surface quality; SSIM; SSD; Etruscan jewel; granulation;

机译：3D；数字显微镜SFF；表面质量SSIM； SSD;伊特鲁里亚宝石；造粒;

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Micromorphology of gold jewels: a novel algorithm for 3D reconstruction and its quality assessment

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