Information AboutDigital Image |
| CATEGORIES ABOUT DIGITAL IMAGE | |
| image processing | |
| digital geometry | |
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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. Digital images can be Created by a variety of input devices and techniques, such as Digital Camera s, Scanner s, 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. 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 ( Sample s) related to that position. Digital images can be classified according to the number and nature of those samples:
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 . 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. Some viewers offer a Slideshow utility, to see the images in a certain folder one after the other automatically. 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 Error s 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. SEE ALSO
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