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Digital imaging
 
 
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Digital imaging or digital image acquisition is the creation of digital image
Digital image

A digital image is a representation of a two-dimensional using ones and zeros . Depending on whether or not the is fixed, it may be of vector graphics or raster graphics type....
s, typically from a physical object. The term is often assumed to imply or include the processing
Digital image processing

Digital image processing is the use of computer algorithms to perform on digital images. As a subfield of digital signal processing, digital image processing has many advantages over analog image processing; it allows a much wider range of algorithms to be applied to the input data, and can avoid problems such as the build-up of noise and si...
, compression
Image compression

Image compression is the application of Data compression on digital images. In effect, the objective is to reduce redundancy of the image data in order to be able to store or data transmission data in an efficient form....
, storage, printing
Digital printing

Digital printing is the reproduction of digital images on a physical surface. It is generally used for short print runs, and for the customization of print media....
, and display of such images.

Digital imaging was developed in the 1960s and 1970s, largely to avoid the operational weaknesses of film cameras, for scientific and military missions including the KH-11
KH-11

The KH-11, also referenced by the codenames 1010, Crystal and Kennan, also commonly known as "Key Hole", was a type of reconnaissance satellite launched by the United States National Reconnaissance Office between December 1976 and 1990 and used until present....
 program. As digital technology became cheaper in later decades it replaced the old film methods for most purposes.

A digital image may be created directly from a physical scene by a camera
Digital camera

A digital camera is a camera that takes video or still photographs, or both, digitally by recording digital image via an electronics .Many compact digital still cameras can record sound and moving video as well as still photographs....
 or similar devices.






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Encyclopedia


Digital imaging or digital image acquisition is the creation of digital image
Digital image

A digital image is a representation of a two-dimensional using ones and zeros . Depending on whether or not the is fixed, it may be of vector graphics or raster graphics type....
s, typically from a physical object. The term is often assumed to imply or include the processing
Digital image processing

Digital image processing is the use of computer algorithms to perform on digital images. As a subfield of digital signal processing, digital image processing has many advantages over analog image processing; it allows a much wider range of algorithms to be applied to the input data, and can avoid problems such as the build-up of noise and si...
, compression
Image compression

Image compression is the application of Data compression on digital images. In effect, the objective is to reduce redundancy of the image data in order to be able to store or data transmission data in an efficient form....
, storage, printing
Digital printing

Digital printing is the reproduction of digital images on a physical surface. It is generally used for short print runs, and for the customization of print media....
, and display of such images.

Digital imaging was developed in the 1960s and 1970s, largely to avoid the operational weaknesses of film cameras, for scientific and military missions including the KH-11
KH-11

The KH-11, also referenced by the codenames 1010, Crystal and Kennan, also commonly known as "Key Hole", was a type of reconnaissance satellite launched by the United States National Reconnaissance Office between December 1976 and 1990 and used until present....
 program. As digital technology became cheaper in later decades it replaced the old film methods for most purposes.

A digital image may be created directly from a physical scene by a camera
Digital camera

A digital camera is a camera that takes video or still photographs, or both, digitally by recording digital image via an electronics .Many compact digital still cameras can record sound and moving video as well as still photographs....
 or similar devices. Alternatively, it may be obtained from another image
Image

An image is an artifact, usually two-dimensional , that has a similar appearance to some subject —usually a physical object or a person....
 in an analog medium, such as photograph
Photograph

A photograph is an created by light falling on a light-sensitive surface, usually photographic film or an electronic imager such as a Charge-coupled device or a Complementary metal?oxide?semiconductor chip....
s, photographic film
Photographic film

Photographic film is a sheet of plastic coated with an emulsion containing light-sensitive silver halide salts with variable crystal sizes that determine the sensitivity, contrast and of the film....
, or printed
Printing

Printing is a process for reproducing text and image, typically with ink on paper using a printing press. It is often carried out as a large-scale industrial process, and is an essential part of publishing and transaction printing....
 paper, by a scanner
Image scanner

In computing, a scanner is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image. Common examples found in offices are variations of the desktop scanner where the document is placed on a glass window for scanning....
 or similar device. Many technical images—such as those acquired with tomographic equipment
Tomography

Tomography is imaging by sections or sectioning. A device used in tomography is called a tomograph, while the image produced is a tomogram....
, side-looking radar, or radio telescope
Radio telescope

A radio telescope is a form of Directional antennae radio Antenna used in radio astronomy and in tracking and collecting data from satellites and space probes....
s—are actually obtained by complex processing of non-image data. Finally, a digital image can also be computed from a geometric model or mathematical formula (however, in this case the name image synthesis is more appropriate).

Digital image authentication is an emerging issue for the providers and producers of high resolution digital images such as health care organizations, law enforcement agencies and insurance companies. There are methods emerging to analyze a digital image and determine if it has been altered or not.

See also


  • Digital image processing
    Digital image processing

    Digital image processing is the use of computer algorithms to perform on digital images. As a subfield of digital signal processing, digital image processing has many advantages over analog image processing; it allows a much wider range of algorithms to be applied to the input data, and can avoid problems such as the build-up of noise and si...
  • Dynamic imaging
    Dynamic imaging

    Dynamic imaging is the amalgamation of digital imaging and workflow automation. It is used to automate the creation of s by zooming, panning, colorize and performing other and color management operations on a copy of a digital master....
  • Image editing
    Image editing

    Image editing encompasses the processes of altering s, whether they be Digital photographys, traditional Photographic processings, or illustrations....
  • Image retrieval
    Image retrieval

    An image retrieval system is a computer system for browsing, searching and retrieving images from a large database of digital images. Most traditional and common methods of image retrieval utilize some method of adding metadata such as captioning, keyword s, or descriptions to the images so that retrieval can be performed over the annotation...
  • Graphics file format
  • Graphic image development
  • Society for Imaging Science and Technology, (IS&T)
  • Film recorder
    Film recorder

    A Film Recorder is a graphical output device for transferring digital images to photographic film.All film recorders typically work in the same manner....


External links


  • Cornell University.


  • Dartmouth, Hany Farid.


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