Characteristics of the Digitisation Workplace
The digitisation workplace of AiP Beroun, located in the building of the National Library of the CR in the Klementinum, is equipped with four modern digitisation lines. The lines specialise in the digitisation of bound historical documents, mainly manuscripts and early printed books (equipment: CRUSE special Bookscanner CS145 B 220, Memoria-BetterLight 6000, Memoria III and Scan2page). Before the actual digitisation process, each original (manuscript or early printed book) is individually assessed to select the optimal method of digitisation on one of the digitisation lines to meet all the safety and other specific requirements arising from the character and physical condition of the specific document as well as to achieve a high-quality digital image output.
The video cameras used have a resolution of 7500 x 10500 pixels (with an interleaving of 15000 x 21000 pixels), which corresponds to 450 dpi in the case of an A2-size document (an A0-document with interleaving). The maximum size of uncompressed image files may be up to 425 MB (RGB 24bit), 850 MB (RGB 48bit), with interleaving up to 1.5 GB. Without a contact, it is practically possible to achieve a resolution of up to 1250 dpi without any recalculations and approximations.
CRUSE special Bookscanner CS145 B 220
The equipment CRUSE special Bookscanner CS145 B 220 is characterised by non-contact digitisation, superb image quality, sophisticated control software, extremely accurate and reproducible setting, full-screen image alignment to a reference white surface, individual ICC profiles for all light variations while meeting the high demands on the safety and protection of rare documents when photographing and handling them without resorting to compromise. This unique equipment is a product of close cooperation between the companies CRUSE (http://www.crusedigital.com) and AiP Beroun s.r.o., the latter of which participated in its development by providing consultations and know-how from earlier digitisation of rare books and manuscripts.
The workplace has been designed for digitising materials with the highest demands. It is able to digitise books with no size or weight limitations, flat documents of sizes bigger than A0 – maps, posters, paintings. Historical originals are usually scanned using the method of a naturally opened book. Of course, it is possible take advantage of a document-friendly vacuum board for loose leaves. The digitisation equipment also allows work with optimal studio light for unusual documents, for instance for golden illuminations. The device is equipped with safe cold light with additional double filtration of residual IR and UV radiation.
This second-generation equipment has been developed in a special construction designed for contact-free digitisation. Of course, it enables safe manipulation with valuable historical documents, especially books. It utilises a large-format reproductive video camera and is equipped with a BetterLight 6000 scanner wall.
Apart from the high quality of the images scanned, another reason for the repeated purchase of BetterLight scanning walls was the robustness of their design and their absolute reliability. The equipment achieves a resolution of 6000 x 8000 pixels, i.e. ca 680 dpi for an A4-format and ca 350 dpi for an A2-format. Historical originals are usually scanned using the method of a naturally opened book. Likewise this device is equipped with exceptionally safe cold light and additional filtration eliminating residual IR and UV radiation.
The equipment builds on previous experience and is designed traditionally with respect to documents requiring careful handling and high production quality. Historical originals are usually scanned using the method of a naturally opened book. The processing of documents using this equipment guarantees an entirely safe process for the originals scanned, a traditionally high quality of image data and a maximum resolution of 33 million pixels.
The latest semi-automated equipment Scan2page specialises in document-friendly digitisation of bound historical books that is even more time-efficient. It makes it possible to digitise originals of a size of 2xA6–2xA2 at a resolution of 200–600 DPI. The device is equipped with an automatically adjustable cradle for book placement. The book is open at 180 degrees. During the digitisation process, the pages are turned manually, and hence very carefully, by the operator. The actual scanning process is automated. At the moment of digitisation, the document is covered by a glass plate. The digital images of the two opposing pages are scanned simultaneously, which significantly increases the efficiency of the process while preserving the maximum safety for the original document.