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Automatic System for Annual Ring Width Measurement and Application to Ancient Wooden Cultural Properties

年轮宽度自动测量系统及其在古木文化财产中的应用

基本信息

批准号：
14380053
负责人：
MITSUTANI Takumi
金额：
$ 8.64万
依托单位：
Independent Administrative Institution National Research Institute for Cultural Properties, Nara
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

The basis of any dendrochronologic research is to measure annual ring width to an accuracy of 10 μm. Conventional annual ring readers were stationary devices with a binocular microscope and often stationed in research labs, therefore they presented certain limitations in measuring actual specimens. Accordingly, in order to expand the scope of application to a wider and more diverse range of ancient wooden cultural properties. it is necessary to consider other methods of measuring annual ring width.Our objective was, in this regard, to build a semi-automatic system for measuring annual ring width. In this project, we developed such as system that uses the latest optical technology to indirectly obtain an image of the annual rings rather than directly measure ring width on the actual object. The tested equipment included a silver salt camera, digital camera, scanner and soft X-ray photography. It was learned that, of these devices, the most suitable for a wide range of ancient wooden cultural properties was a high resolution digital camera.The method we employed to measure annual ring width was to import the ring image captured with a digital camera into a computer and perform measurements with purpose-specific software that was developed in this project. The method was very effective and, though some corrections are needed with the software, we expect this to become the mainstream in annual ring width measurement.As part of this project, the age of honden (main shrine) and haiden (altar) of Ujigami-jinja Shrine, a National Treasure located in Uji, Kyoto, was measured using a single lens reflex digital camera of 11 M effective pixels. Results confirmed that the main shrine had been built in about 1060 A.D. and the altar around 1290 A.D.The fruits of this research project can be applied to many old architectural members, wooden sculptures of all sizes and a diversity of artworks, and should play a major role in research into architectural and art history.

任何树木年代学研究的基础都是测量年轮宽度，精度达到10 μm。传统的年轮阅读器是固定的设备，通常安装在研究实验室中，因此在测量实际标本时存在一定的局限性。相应地，为了将适用范围扩大到更广泛、更多样化的古代木文化财产。我们的目标是建立一个半自动的年轮宽度测量系统。在这个项目中，我们开发了这样一种系统，它使用最新的光学技术来间接获得年轮的图像，而不是直接测量实际物体上的年轮宽度。测试的设备包括银盐相机、数码相机、扫描仪和软X射线摄影。据了解，在这些设备中，最适合于大范围古木文化遗产的是高分辨率数码相机。我们测量年轮宽度的方法是将数码相机拍摄的年轮图像导入计算机，使用本项目开发的专用软件进行测量。该方法是非常有效的，虽然需要一些修正的软件，我们希望这将成为主流的年轮宽度测量。作为本项目的一部分，本殿（主神社）和坛（坛）的宇之神神社，位于京都宇之，国家宝藏，使用单透镜反射数码相机的有效像素为11万测量。研究成果可应用于许多古老的建筑构件、各种大小的木雕和各种艺术品，在建筑史和艺术史研究中应发挥重要作用。