Category Archives: Glossary

Digital repository

As physical stacks are needed to be well managed and well organized, so is the case with online information. One wants online resources to be researchable and organized, just like hard copies.

A digital repository provides you a hub of online resources that one might need for a variety of different functions and purposes. In addition, the digital repository is responsible for preserving digital content.

How do digital repositories work?

Digital repository is a broader term that includes the journey from a single software system to the overall management and planning of online materials. This stewardship is not restricted to hardware or software solely but extends to services, processes, content, rules, regulations, and metadata.

While keeping up intelligent control, digital repositories hold a particular and permanent location so that researchers may not face any difficulty in finding the digital materials they are looking for.

We can find two basic types of digital repositories:

1) Institutional Repository

2) Disciplinary Repository

As evident by its title, an institutional repository is a repository or collection of an institution’s particular resources.
On the other hand, some repositories work as subject-based online archives maintained by a subject community. Such a disciplinary repository contains the data associated with scholars in a specific area.

Advantages of digital repositories

  • A digital repository deals with intellectual stuff and metadata in the same area.
  • It allows user-friendly remote access to resources. It works as a valuable tool for RAE (Research Assessment Exercise).
  • A digital repository allows organizations and institutions to preserve the integrity of their intellectual assets efficiently.
  • These repositories allow the deposits in bulks, thus reducing the need for physical storage.

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Bayer Matrix (Bayer Sensor)

The Bayer matrix is the spatial arrangement of the red, green and blue pixels on a color sensor. A single pixel cannot capture all wavelengths, only the primary colors. Therefore, there are three different types of pixels, called RGB, on a sensor. Without offsetting, this would lead to a loss of 2/3 of the liquidation.

A color sensor of 30 MP, for example, delivers 30 MP color information. This is achieved in that the blue pixel fetches the missing color information red and green from the nearest pixel and uses this information to calculate the real color. This creates 30 MP color information, each from the three values of the basic colors. This process is called demosaicing and the offsetting is the know-how of the camera manufacturer. However, since many different sensors have to be calculated, the Bayer standard has been agreed upon. Here 50% green, 25% blue and 25% red pixels are used.

This division of colors corresponds roughly to that in nature. There are also different methods, for example Sony uses two different shades of green. 

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Autofocus

Autofocus is a common feature when taking photos with consumer cameras from providers such as Sony, Nikon, or Canon. Before the shutter is released, the focal length is automatically adjusted so that the subject is in focus. Although this function is very useful for private amateur photographers, it is not very helpful for professional digitization. Due to the frequent change of focus, the size of the image section does not remain constant either. This leads to image jumps when looking at the scans. In addition, the mechanics of such cameras are designed more for horizontal photography. Working overhead, such as with a repro system, makes working conditions difficult. With a daily number of several thousand scans, these consumer cameras wear out very quickly.

To minimize this wear and tear and to ensure a comfortable and productive workflow, we use a motorized focus that automatically focuses on defined positions while maintaining its settings. This gives our customers the advantage of quick focus adjustment without having to accept the disadvantages mentioned above.

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