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Encyclopedia > Digital image

A digital image is a representation of a two-dimensional image as a finite set of digital values, called picture elements or pixels. A digital system is one that uses numbers, especially binary numbers, for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (an analog system) or non-numeric symbols such as letters or icons. ... For images in Wikipedia, see Wikipedia:Images. ... For images in Wikipedia, see Wikipedia:Images. ... A digital system is one that uses numbers, especially binary numbers, for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (an analog system) or non-numeric symbols such as letters or icons. ... A pixel (pix, 1932 abbreviation of pictures, coined by Variety headline writers + element) is one of the many tiny dots that make up the representation of a picture in a computers memory. ...


Typically, the pixels are stored in computer memory as a raster image or raster map, a two-dimensional array of small integers. These values are often transmitted or stored in a compressed form. Suppose the smiley face in the top left corner is an RGB bitmap image. ... Suppose the smiley face in the top left corner is an RGB bitmap image. ... Image compression is the application of data compression on digital images. ...


Digital images can be created by a variety of input devices and techniques, such as digital cameras, scanners, coordinate-measuring machines, seismographic profiling, airborne radar, and more. They can also be synthetized from arbitrary non-image data, such as mathematical functions or three-dimensional geometric models; the latter being a major sub-area of computer graphics. The field of digital image processing is the study of algorithms for their transformation. Digital imaging or digital image acquisition is the creation of digital images, typically from a physical object. ... A SiPix digital camera next to a matchbox to show scale. ... Desktop scanner, with the lid raised. ... Computer graphics (CG) is the field of visual computing, where one utilizes computers both to generate visual images synthetically and to integrate or alter visual and spatial information sampled from the real world. ... It has been suggested that this article or section be merged into image processing. ...

Contents


Image types

Each pixel of an image is typically associated to a specific 'position' in some 2D region, and has a value consisting of one or more quantities (samples) related to that position. Digital images can be classified according to the number and nature of those samples: A sample refers to a value or set of values at a point in time and/or space. ...

The term digital image is also applied to data associated to points scattered over a three-dimensional region, such as produced by tomographic equipment. In that case, each datum is called a voxel. A binary image is a digital image that has only two possible values for each pixel. ... In computing, a grayscale or greyscale digital image is an image in which the value of each pixel is a single sample. ... A (digital) color image is a digital image that includes color information for each pixel. ... This article or section should be merged with false-color A false-color or pseudo-color image is a color image derived from a grayscale one by mapping each pixel value to a color according to a table or function. ... Multi-spectral images are images of the same object (earth surface), taken in different bands of visible or infrared region of electromagnetic continuum. ... Thematic Images are usually image products of classification processing of multispectral images. ... Volume, also called capacity, is a quantification of how much space an object occupies. ... Tomography is imaging by sections or sectioning. ... A voxel (a portmanteau of the words volumetric and pixel) is a volume element, representing a value in three dimensional space. ...


Image viewing

The user can utilize different program to see the image. The GIF, JPEG and PNG images can be seen simply using a web browser because they are the standard internet image formats. The SVG format is more and more used in the web and is a standard W3C format. With pictures like this you can see the restriction of 256 colours. ... A photo of a flower compressed with successively lossier compression ratios from left to right. ... For other uses, see PNG (disambiguation). ... It has been suggested that Comparison of web browsers be merged into this article or section. ... Static image generated from an SVG example. ... The World Wide Web Consortium (W3C) is a consortium that produces standards—recommendations, as they call them—for the World Wide Web. ...


Some viewers offer a slideshow utility, to see the images in a certain folder one after the other automatically. Slideshow is a modern concatenation of Slide Show. A slideshow is a display of a series of chosen images, which is done for artistic or instructional purposes. ...


Image calibration

Proper use of a digital image usually requires knowledge of the relationship between it and the underlying phenomenon, which implies geometric and photometric (or sensor) calibration. One must also keep in mind the unavoidable errors that arise from the finite spatial resolution of the pixel array and the need to quantize each sample to a finite set of possible values. When converting from an analog signal to a digital signal, error is unavoidable. ... Resolving power is the ability of a microscope or telescope to measure the angular separation of images that are close together. ... Generally, quantization is the state of being constrained to a set of discrete values, rather than varying continuously. ...


See also


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Digital Image Recovery Data Recovery Digital Photo Recovery Memory Stick Recovery Service (662 words)
Digital image recovery and damaged file recovery is available for micro SD flash media, mini SD flash memory cards, cell phone recovery, voice recorder recovery and any other broken drive or damaged digital storage device with lost data.
Digital image recovery products are quickly becoming part of our lives; from digital cameras and digital photos to sophisticated data recovery.
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Digital image - Wikipedia, the free encyclopedia (361 words)
A digital image is a representation of a two-dimensional image as a finite set of digital values, called picture elements or pixels.
Digital images can be created by a variety of input devices and techniques, such as digital cameras, scanners, coordinate-measuring machines, seismographic profiling, airborne radar, and more.
Proper use of a digital image usually requires knowledge of the relationship between it and the underlying phenomenon, which implies geometric and photometric (or sensor) calibration.
  More results at FactBites »

 
 

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