Digital image processing is the use of computer algorithms to perform image processing on digital images. Digital image processing has the same advantages (over analog image processing) as digital signal processing has (over analog signal 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 signal distortion during processing.
The most common kind of digital image processing is digital image editing.
History
Many of the techniques of digital image processing, or digital picture processing as it was often called, were developed in the
1960s at the
Jet Propulsion Laboratory,
MIT,
Bell Labs,
University of Maryland, and a few other places, with application to
satellite imagery, wirephoto standards conversion,
medical imaging,
videophone,
character recognition, and photo enhancement.
[Azriel Rosenfeld, Picture Processing by Computer, New York: Academic Press, 1969] But the cost of processing was fairly high with the computing equipment of that era. In the
1970s, digital image processing proliferated, when cheaper computers and dedicated hardware became available. Images could then be processed in real time, for some dedicated problems such as
television standards conversion. As general-purpose computers became faster, they started to take over the role of dedicated hardware for all but the most specialized and compute-intensive operations.
More on
[ Digital image processing ]
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