Digitizing

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"Digitizer" redirects here. This article covers the general concept of digitization- for other uses, see Digitizer (disambiguation).

Digitizing or digitization[1] is representing an object, image, sound, document or a signal (usually an analog signal) by a discrete set of its points or samples. The result is called "digital representation" or, more specifically, a "digital image", for the object, and "digital form", for the signal. Strictly speaking, digitizing means simply capturing an analog signal in digital form, but digitizing texts is also used to mean converting the image to text, via optical character recognition.

McQuail identifies the process of digitization having immense significance to the computing ideals as it "allows information of all kinds in all formats to be carried with the same efficiency and also intermingled" (2000:28) [2]

Contents

[edit] Process

Analog signals are continuously variable, both in the number of possible values of the signal at a given time, as well as in the number of points in the signal in a given period of time. However, digital signals are discrete in both of those respects – generally a finite sequence of integers, and so a digitization can only ever be an approximation of the signal it represents.

Digitization occurs in two parts:

Discretization
reading an analog signal A, and, at regular time intervals (sampling frequency), sampling the value of the signal at the point. Each such reading is called a sample, and may be considered infinite precision at this stage.
Quantization
These samples are then rounded to a fixed set of numbers (such as integers), which is called quantization.

In general, these can occur at the same time, though they are conceptually distinct.

A series of integers can be transformed back into an analog signal that approximates the original analog signal. Such a transformation is called DA conversion. There are two factors determining how close such an approximation to an analog signal A a digitization D can be, namely the sampling rate and the number of bits used to represent the integers.

[edit] Usage examples

The term digitization is often used when diverse forms of information, including text, sound, image and voice, are encoded in a single 0-1 binary code. Digital information exists in only one of two forms -0 or 1- which are called bits (a contraction of 'binary digits'), and the sequences of 0s and 1s that constitute information are called bytes. [3]

The term is often used for the scanning of analog sources, such as printed photos or taped videos into computers for editing, but it also can refer to audio (where sampling rate is often measured in kilohertz) and textures map transformation. In this last case, as in normal photos, sampling rate refers to the resolution of the image (often measured in pixel per inch). Digitizing is the primary way of storing images in a form suitable for transmission and computer processing.

Digitizing is making a digital representation of geographical features within a raster image or vector using a geographic information system, i.e, the creation of electronic maps, either from various geographical imagery or by digitizing the traditional paper maps.

Since the advent of digital video the term continues to be frequently used, as of 2005, to refer to the process of importing footage into a computer via a FireWire cable. But this is not technically accurate, as the footage is already digital, so it is not really being digitized, but rather encoded into whatever format the non-linear video editing software uses.[citation needed]

"Digitization" is also used to describe the process of populating databases with files or data. While this usage is technically inaccurate, it originates for the previously-proper use of the term to describe the part of the process which involved converting the analog sources (printed pictures, printed brochures, etc.) into the digital representation before uploading to the target database(s).

Digitizing is also used in the field of apparel where an image is recreated by artists with the help of embroidery digitizing software tools and saved as embroidery machine code. This machine code is fed into an embroidery machine and embroidered onto apparels. The most supported format is DST file.

Digitizing also refers to the process of acquiring precise dimensions from a real world object, such as a car, using a CMM (Computer-Aided Manufacturing Measurement) device.[4]. Common digitization methods include optical 3d (laser) scanners as well.

[edit] Analog signals to digital

Analog signals are continuous electrical signals. Digital signals are non-continuous. [5]

Nearly all recorded music has been digitized. About 12 percent of the 500,000+ movies listed on the Internet Movie Database are digitized on DVD.


[edit] Digitizing Processes

The broad use of internet and the increasing popularity of Lean philosophy has also increased the use and meaning of "digitizing". It is now often used in order to describe the work of improving organizational processes. This will often involve some kind of a Lean process in order to simplify process activities. In many organizations this will be followed up with an effort of improving the efficiency in the new "lean and mean" process by digitizing data and activities. There are no doubt that internet technology have improved many valuechains and also shifted the focus on organizational cooperation into the "battlefield" of value chain cooperation and competition.

[edit] Analog texts to digital

About 5 percent of texts have been digitized as of 2006.[6]

Older print books are being scanned and optical character recognition technologies applied by academic and public libraries, foundations, and private companies like Google.[7]

Unpublished text documents on paper which have some enduring historical or research value are being digitized by libraries and archives, though frequently at a much slower rate than for books (see digital libraries). In many cases, archives have replaced microfilming with digitization as a means of preserving and providing access to unique documents.

[edit] Implications of Digitization

This shift to digitization in the contemporary media world has created implications for traditional mass media products, however these "limitations are still very unclear" (McQuail, 2000:28). The more technology advances, the more converged the realm of mass media will become with less need for traditional communication technologies. For example, the Internet has transformed many communication norms, creating more efficiency for not only individuals, businesses also. However, McQuail suggests traditional media have also benefited greatly from new media, allowing more effective and efficient resources available (2000:28).

[edit] Collaborative digitization projects

There are many collaborative digitization projects throughout the United States. Two of the earliest projects were the Collaborative Digitization Project in Colorado and NC ECHO - North Carolina Exploring Cultural Heritage Online, based at the State Library of North Carolina.

These projects establish and publish best practices for digitization and work with regional partners to digitize cultural heritage materials. Additional criteria for best practice have more recently been established in the UK, Australia and the European Union.[8] Wisconsin Heritage Online is a collaborative digitization project modeled after the Colorado Collaborative Digitization Project. Wisconsin uses a wiki to build and distribute collaborative documentation. Georgia's collaborative digitization program, the Digital Library of Georgia, presents a seamless virtual library on the state's history and life, including more than a hundred digital collections from 60 institutions and 100 agencies of government. The Digital Library of Georgia is a GALILEO initiative based at the University of Georgia Libraries.


In South-Asia Nanakshahi trust is digitizing manuscripts of Gurmukhi Script.

[edit] Library Preservation

Digital preservation at its most basic definition is a series of activities aimed towards ensuring access to digital materials over time.[9] Digitization is a means of creating digital surrogates of analog materials such as books, newspapers, microfilm, and videotapes. Digitization can provide a means of preserving the content of the materials by creating an accessible facsimile of the object in order to put less strain on already fragile originals.

The prevalent Brittle Books[10] issue facing libraries across the world is looking towards a digital solution in long term preservation.[11] For centuries, books were printed on wood-pulp paper, which turns acidic over the period of its decay. As the paper ages, it deteriorates to a point of being completely unusable. In theory, if these widely circulated titles are not treated with de-acidification processes, the materials upon those acid pages will be lost forever. As technology evolves, it is increasingly becoming a preferred method of preserving these materials - mainly because it can provide easier access points and significantly reduced amounts of physical storage space.

Google, Inc. has taken steps towards attempting to digitize every title with "Google Book Search"[12][13]. While some academic libraries are in contract with the service, issues of copyright law violations threaten to derail the project.[14] However, it does provide - at the very least - an online consortium for libraries to exchange information and for researchers to search for titles as well as review the materials.

[edit] Fiction

Works of science-fiction often include the term digitize as the act of transforming people into digital signals and sending them into a computer. When that happens, the people disappear from the real world and appear in a computer world (as featured in the cult film Tron, the animated series Code: Lyoko, or the late 1980s live-action series Captain Power and the Soldiers of the Future). In the video game Beyond Good and Evil the protagonist's holographic friend digitizes the player's inventory items.

[edit] See also

Search Wiktionary Look up digitizing or digitisation in Wiktionary, the free dictionary.

[edit] References

  1. ^ Also known as digitising or digitisation, digitalizing or digitalization, and digitalising or digitalisation; see American and British English spelling differences.
  2. ^ McQuail, D (2000) McQuail's Mass Communication Theory (4th edition), Sage, London, pp. 16-34
  3. ^ Flew, Terry. 2008. New Media An Introduction. South Melbourne. 3rd Edition. South Melbourne: Oxford University Press.
  4. ^ Digimation for 3D Models, 3D Software and Creative Services
  5. ^ http://cbdd.wsu.edu/kewlcontent/cdoutput/TR502/page8.htm
  6. ^ New York Times; May 14, 2006; Scan This Book!
  7. ^ http://www.google.com/press/pressrel/print_library.html "Google Checks Out Library Books," Press release, December 14, 2004
  8. ^ Digital Libraries: Principles and Practice in a Global Environment, Ariadne April 2005.
  9. ^ “What is Digital Preservation”. Library Technology Reports 44:2 (Feb/March 2008): 5.
  10. ^ http://en.wikipedia.org/wiki/Brittle_Books_Program
  11. ^ Cloonan, M.V. and Sanett, S. “The Preservation of Digital Content,” Libraries and the Academy. Vol. 5, No. 2 (2005): 213-37.
  12. ^ http://en.wikipedia.org/wiki/Google_Book_Search
  13. ^ http://books.google.com/
  14. ^ Baksik, C. “Fair Use or Exploitation? The Google Book Search Controversy,” Libraries and the Academy. Vol. 6, No. 2 (2006): 399-415.
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