Multispectral


book2net has developed a new method for multispectral analysis of documents and drawings.

The development of an innovative technology for multispectral analyzes in the range of 300 – 1300 nm was the task of our research project. At definable nm intervals, individual or series of scans can be performed. The scan results can be superimposed pixel by pixel and analyzed. The book2net method works without filter change (vibration-free) and without post-correction of sharpness and focus in the spectral ranges (i.e. pixel scale accurate). Pixel-accurate overlay, division, subtraction and addition techniques can be applied to this database for image analysis and visualization of the desired information.

A systematic standardization of the scanning, light and imaging processes and deposition of profile structures enables comparability and repeatability. Profile structures allow the formation of classes or analysis groups.

Applications

In the field of multispectral analysis of documents, the following special fields of application can be defined:


Reconstruction of documents

Different damage classes, each with specific analysis methods: fire damage, water damage, mold, aging damage or combinations of several damage classes.
Examples: fire damage Anna Amalia Library Weimar, water damage Cologne City Archive, adhesive residues and mold Klassik Stiftung Weimar

Authentication of drawing

Example: complete multispectral analysis of the Lucretia, Klassik Stiftung Weimar, Graphic Art Collections

Material analysis in documents and drawings

On the basis of self-created reference and test targets comparative material considerations are carried out.
e.g. Analysis of ink, graphite pencil, lead handle, etc.
e.g. Analysis of white “colors”: lead white, lithipone, zinc white, rubber, white, gypsum, lime, etc.

Spectral Range

Scan series with reflected light and reflected light plus transmitted light form the database for the multispectral analysis. The example shows the spectral range from 350nm up to 950nm (optional up to 1250nm) with a selected increment of 100nm.

The software filter processes the native analog information specific to each spectral region while automatically generating a color image, false colors (UV/IR/VIS), 3 color channels and grayscales.

Underdrawings

The different levels of the drawing are clearly distinguishable in the IR range. Recognizable auxiliary lines might have been used as perspective tools for copies or scale changes.

Pixel Overlay

The pixel overlay technique allows to extract the material structure, watermarks etc. The pixel difference analysis allows detailed comparisons between the individual levels of the drawing:

Authentication

Watermarks, signatures or material structures are visualized by the image analyser, providing evidence of origin and originality (comparison with databases or proofed originals of the artist).

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