Category Archives: V

VIS spectroscopy

VIS spectroscopy (also VIS spectrometry) is a variant of spectroscopy in which the reflection or absorption of light in the visible spectral range (VIS for short) in the wavelength range from approx. 400 to 780 nanometers is measured on the surface of an object. It is used for qualitative and quantitative analyses, among others in forensics and art technology.

Particularly in art technological investigations, this is often done in combination as UV-VIS absorption spectroscopy. This allows the identification of pigments (mostly inorganic) and dyes (organic) independent of their carrier material (paintings, graphics, murals, furniture, textiles, etc.).

The method uses the selective interaction of electromagnetic radiation from the visible light and its adjacent wavelength ranges with the materials to be examined; part of the irradiated light is absorbed, part is reflected. This results in a specific spectrum for each material, an optical fingerprint, so to speak. This can be compared with reference materials and thus lead to an identification of the colorant.

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V-shape scanner

V-shape scanners are special book scanners whose book cradle can be adjusted to an opening angle smaller than 180° to a V-shaped support form to ensure the gentle capturing for particularly valuable or sensitive bound books and documents that can only be digitized at a small opening angle.

book2net offers a wide range of V-scanners − from mobile tabletop devices to high-performance scanners with semi-robotics.

Benefit from our book scanners with the latest CMOS sensor technology, as they combine highest quality with high performance, versatility and ease of use.

With our V-shape scanners you can scan books in various formats from A1 to A6, from large format to miniature books; always conforming to Metamorfoze, FADGI and ISO/TS 19264-1:2017 standards.

Our V-shape scanners are specifically designed for the gentlest handling of delicate, valuable and rare books, especially illuminated manuscripts and incunabula. Therefore, they provide special components to make digitization as gentle as possible:

  • Innovative CMOS sensor technology for high-quality, high-speed imaging
  • V-shaped, conservation book cradle with spine release and special coating as desired
  • V-shaped, easy-to-operate and lockable glass plate (for systems with semi-robotics with precision-guided linear drive)
  • Our semi-robotic systems (such as book2net Cobra and Dragon) feature freely selectable fully automatic, semi-automatic or manual book rocker and glass needle pressure operation options.
  • Smooth and adaptable LED lighting system to prevent damage from high light intensity
  • User-friendly software with modules for live preview and programmable scan processes ensure a smooth workflow

Get more information about our systems book2net Cobra, book2net Dragon,  book2net Lizard and book2net Falcon.

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In photographic technology, optical vignetting (edge decoration) is an effect that may be wanted in artistic photography, but is not desired when digitizing documents, which require a true-to-original capturing. Vignetting is essentially a decrease in brightness towards the edge area of the image, which is caused by the light guidance through the objective and the axially arranged openings connected to it.

The resulting images are significantly darker due to the drop in light from the edge and mostly the “lighter” center of the image is shown in a circle.

In order to avoid this effect with our scanners, we work with special lenses in which this effect has already been corrected, unlike conventional camera lenses. Subsequent image manipulation or correction using software is therefore not necessary.


When taking a picture with a microscope through the eyepiece. This photo was taken “freehand” with a compact camera above the microscope eyepiece.
Due to lack of optical adjustment, the edge of the camera sensor cannot be exposed.

Source: Wikipedia Commons (unchanged)  Copyright: Creative Commons Attribution-Share Alike 3.0 Unported

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