Digital image processing
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Template:Mergeto 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.
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History
Because of the computational load of dealing with images containing millions of pixels, digital image processing was largely of academic interest until the 1970s, when dedicated hardware became available that could process images 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.
With the fast computers and signal processors available in the 2000s, digital image processing has become the most common form of image processing, and is generally used because it is not only the most versatile method, but also the cheapest.
Digital processing of camera images
Images taken by popular digital cameras often need processing to improve their quality, a distinct advantage digital cameras have over film cameras. The digital image processing is done by special software programs that manipulate the images is many ways. This process is performed in a "digital darkroom", which is not really a darkroom as it is accomplished via a computer and keyboard.
Uses
Digital image processing allows the use of much more complex algorithms for image processing, and hence can offer both more sophisticated performance at simple tasks, and the implementation of methods which would be impossible by analog means.
In particular, digital image processing is the only practical technology for:
Some techniques which are used in digital image processing include:
- Principal components analysis
- Independent component analysis
- Self-organizing maps
- Hidden Markov models
- Neural networks
See also
- Digital image editing
- Image processing
- Computer graphics
- Computer vision
- GPGPU
- imaging
- Satellite imagery
External links
- Template:Wikicities
- Image Processing forum (image coding, compression, digital effects, mpeg, etc)
- GRAIL, the Graphics and Imaging Laboratory of the University of Washington
- Virginia Image and Video Analysis group
- Advanced Imaging Laboratory of the University of Victoria
- FILTERS : a free open source image processing libraryde:Bildbearbeitung
es:Procesamiento digital de imágenes nl:Digitale beeldbewerking sv:Bildbehandling th:การประมวลผลภาพดิจิทัล