About: Image gradient

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An image gradient is a directional change in the intensity or color in an image. The gradient of the image is one of the fundamental building blocks in image processing. For example, the Canny edge detector uses image gradient for edge detection. In graphics software for digital image editing, the term gradient or color gradient is also used for a gradual blend of color which can be considered as an even gradation from low to high values, as used from white to black in the images to the right. Another name for this is color progression.

Attributes	Values
rdf:type	organisation
rdfs:label	Image gradient (en)
rdfs:comment	An image gradient is a directional change in the intensity or color in an image. The gradient of the image is one of the fundamental building blocks in image processing. For example, the Canny edge detector uses image gradient for edge detection. In graphics software for digital image editing, the term gradient or color gradient is also used for a gradual blend of color which can be considered as an even gradation from low to high values, as used from white to black in the images to the right. Another name for this is color progression. (en)
foaf:depiction
dcterms:subject	Computer graphics Image processing
Wikipage page ID	4621211 (xsd:integer)
Wikipage revision ID	1119649092 (xsd:integer)
Link from a Wikipage to another Wikipage	Elevation Derivative Vector (geometric) Posterization Color Color banding Continuous function Convolution Geographic information system Gradient Sobel operator Color gradient Kernel (image processing) Partial derivative Data Computer graphics Image processing Finite differences Gradient-domain image processing Graphics software Prewitt operator Edge detection Population density Image derivatives Canny edge detector Map Image processing Total variation denoising Sobel filter Digital image editing dbr:Wiktionary:gradation
Link from a Wikipage to an external page	https://archive.org/details/computervision00shap https://archive.org/details/computervision00shap/page/n156 http://reference.wolfram.com/mathematica/ref/GradientFilter.html
sameAs	Image gradient Image gradient Image gradient
dbp:wikiPageUsesTemplate	dbt:Cite_book dbt:Commons_category dbt:Main dbt:Reflist dbt:Rp dbt:Short_description dbt:Unsourced dbt:Color_topics
thumbnail	wiki-commons:Special:FilePath/Gradient2.svg?width=300
has abstract	An image gradient is a directional change in the intensity or color in an image. The gradient of the image is one of the fundamental building blocks in image processing. For example, the Canny edge detector uses image gradient for edge detection. In graphics software for digital image editing, the term gradient or color gradient is also used for a gradual blend of color which can be considered as an even gradation from low to high values, as used from white to black in the images to the right. Another name for this is color progression. Mathematically, the gradient of a two-variable function (here the image intensity function) at each image point is a 2D vector with the components given by the derivatives in the horizontal and vertical directions. At each image point, the gradient vector points in the direction of largest possible intensity increase, and the length of the gradient vector corresponds to the rate of change in that direction. Since the intensity function of a digital image is only known at discrete points, derivatives of this function cannot be defined unless we assume that there is an underlying continuous intensity function which has been sampled at the image points. With some additional assumptions, the derivative of the continuous intensity function can be computed as a function on the sampled intensity function, i.e., the digital image. Approximations of these derivative functions can be defined at varying degrees of accuracy. The most common way to approximate the image gradient is to convolve an image with a kernel, such as the Sobel operator or Prewitt operator. Image gradients are often utilized in maps and other visual representations of data in order to convey additional information. GIS tools use color progressions to indicate elevation and population density, among others. (en)
gold:hypernym	Change
prov:wasDerivedFrom	wikipedia-en:Image_gradient?oldid=1119649092&ns=0
page length (characters) of wiki page	7313 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Image_gradient
is Link from a Wikipage to another Wikipage of	EDavid (robot) Earth mover's distance SVG Tint, shade and tone GIF GIMP Magic User Interface Sobel operator Color gradient Feature (computer vision) Document mosaicing Miniature faking Nude Descending a Staircase, No. 2 Differential interference contrast microscopy Gradient-domain image processing Histogram equalization Gradient (disambiguation) Texture gradient Prewitt operator Atmospheric optics Hold-And-Modify Photo Raster Raster graphics editor Seashore (software) Sky Multi-focus image fusion Total variation denoising Pillarbox
is Wikipage disambiguates of	Gradient (disambiguation)
is foaf:primaryTopic of	wikipedia-en:Image_gradient

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