Browsing Through Closed Books: Evaluation of Preprocessing Methods for Page Extraction of a 3-D CT Book Volume

2017 2nd International Conference on Advanced Materials Research and Manufacturing Technologies

材料科学;机械制造

Stromer, D.^1 ; Christlein, V.^1 ; Schön, T.^2 ; Holub, W.^2 ; Maier, A.^1

Pattern Recognition Lab, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstraße 3, Erlangen, Germany^1

Fraunhofer Development Center for X-ray Technology, Flugplatzstraße 75, Fuerth, Germany^2

关键词: Automatic extraction;    Computation time;    Historical documents;    Low resolution;    Metallic particles;    Pre-processing method;    Special imaging;    X-ray micro-CT;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/229/1/012005/pdf
DOI  :  10.1088/1757-899X/229/1/012005

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

It is often the case that a document can not be opened, page-turned or touched anymore due to damages caused by aging processes, moisture or fire. To counter this, special imaging systems can be used. One of our earlier work revealed that a common 3-D X-ray micro-CT scanner is well suited for imaging and reconstructing historical documents written with iron gall ink - an ink consisting of metallic particles. We acquired a volume of a self-made book without opening or page-turning with a single 3-D scan. However, when investigating the reconstructed volume, we faced the problem of a proper automatic extraction of single pages within the volume in an acceptable time without losing information of the writings. Within this work, we evaluate different appropriate pre-processing methods with respect to computation time and accuracy which are decisive for a proper extraction of book pages from the reconstructed X-ray volume and the subsequent ink identification. The different methods were tested for an extreme case with low resolution, noisy input data and wavy pages. Finally, we present results of the page extraction after applying the evaluated methods.