Digital imaging or digital image acquisition is the creation of digital images, typically from a physical scene. The term is often assumed to imply or include the processing, compression, storage, printing, and display of such images. The most usual method is by digital photography with a digital camera but other methods are also employed.
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 program. As digital technology became cheaper in later decades it replaced the old film methods for many purposes.
Methods
A digital photograph may be created directly from a physical scene by a camera or similar device. Alternatively, a digital image may be obtained from another image in an analog medium, such as photographs, photographic film, or printed paper, by an image scanner or similar device. Many technical images—such as those acquired with tomographic equipment, side-scan sonar, or radio telescopes—are actually obtained by complex processing of non-image data. Weather radar maps as seen on television news are a commonplace example. The digitalization of analog real-world data is known as digitizing, and involves sampling (discretization) and quantization.
Finally, a digital image can also be computed from a geometric model or mathematical formula. In this case the name image synthesis is more appropriate, and it is more often known as rendering.
Digital image authentication is an issue [1] for the providers and producers of digital images such as health care organizations, law enforcement agencies and insurance companies. There are methods emerging in forensic photography to analyze a digital image and determine if it has been altered.
See also
- Digital image processing
- Digital photography
- Dynamic imaging
- Image editing
- Image retrieval
- Graphics file format
- Graphic image development
- Society for Imaging Science and Technology, (IS&T)
- Film recorder
- Photoplotter
References
External links
- Cornell University. Digital imaging tutorial
- Digital Imaging Definitions/Glossary/Terms. Digital Imaging Definitions
- Dartmouth, Hany Farid. Digital Image Forensics
Tidak ada komentar:
Posting Komentar