Which type of scanner is suitable for a particular project depends on the nature of the original document (type, condition, format etc.) and the scope of the project.
For sensitive documents, the choice of equipment and components should be coordinated with an expert.
The most important scanner types at a glance:
|Special constructions such as the Grazer Book Table (external link) or the Wolfenbuettel Book Reflector (external link) enable a gentle, non-contact digitization of fragile documents (e.g. manuscripts, early printed books, codices)||Complicated individual settings and manual handling result in a low throughput|
|3D camera system (360° object representation): consecutive images of an object in a 360° view (uni- or biaxial). And subsequent assemblage of the images by a 3D viewer|
|Laser technology: creation of a so-called point cloud with central survey points. This point cloud is the starter model for the virtual reconstruction of the object|
Practical example – 3D camera system e-pics.ch
Presentation ETH E-Pics Earth Science Collections (external link)
Selecting the right device
A list of the main criteria for selecting a scanner is presented below. Tests with your own material and standardised test images are recommended to verify the quality. These are usually provided by the device manufacturers. Test phases in your own house can also be agreed with good providers.
Criteria for the assessment of scanners:
- Image quality: sharpness, colour, resolution, use of ICC profiles
- Protection of the documents: scanning without glass, harmless light, opening angle
- Scanning speed in practical use
- Handling, flexibility (different application possibilities for an optimum workload)
- Software, output format, possibility for network and storage connection
- Transportability, ergonomics
- Spatial conditions: areas, ceiling height
- Noise emissions
- References, support, maintenance