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25 relations: Canny edge detector, Color, Color gradient, Colour banding, Continuous function, Convolution, Data, Derivative, Digital image processing, Edge detection, Elevation, Euclidean vector, Finite difference, Geographic information system, Gradient, Gradient-domain image processing, Graphics software, Image derivatives, Image editing, Map, Partial derivative, Population density, Posterization, Prewitt operator, Sobel operator.
Canny edge detector
The Canny edge detector is an edge detection operator that uses a multi-stage algorithm to detect a wide range of edges in images.
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Color
Color (American English) or colour (Commonwealth English) is the characteristic of human visual perception described through color categories, with names such as red, orange, yellow, green, blue, or purple.
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Color gradient
In computer graphics, a color gradient (sometimes called a color ramp or color progression) specifies a range of position-dependent colors, usually used to fill a region.
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Colour banding
Colour banding, or Color banding (American English) is a problem of inaccurate colour presentation in computer graphics.
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Continuous function
In mathematics, a continuous function is a function for which sufficiently small changes in the input result in arbitrarily small changes in the output.
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Convolution
In mathematics (and, in particular, functional analysis) convolution is a mathematical operation on two functions (f and g) to produce a third function, that is typically viewed as a modified version of one of the original functions, giving the integral of the pointwise multiplication of the two functions as a function of the amount that one of the original functions is translated.
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Data
Data is a set of values of qualitative or quantitative variables.
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Derivative
The derivative of a function of a real variable measures the sensitivity to change of the function value (output value) with respect to a change in its argument (input value).
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Digital image processing
In computer science, Digital image processing is the use of computer algorithms to perform image processing on digital images.
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Edge detection
Edge detection includes a variety of mathematical methods that aim at identifying points in a digital image at which the image brightness changes sharply or, more formally, has discontinuities.
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Elevation
The elevation of a geographic location is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational surface (see Geodetic datum § Vertical datum).
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Euclidean vector
In mathematics, physics, and engineering, a Euclidean vector (sometimes called a geometric or spatial vector, or—as here—simply a vector) is a geometric object that has magnitude (or length) and direction.
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Finite difference
A finite difference is a mathematical expression of the form.
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Geographic information system
A geographic information system (GIS) is a system designed to capture, store, manipulate, analyze, manage, and present spatial or geographic data.
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Gradient
In mathematics, the gradient is a multi-variable generalization of the derivative.
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Gradient-domain image processing
Gradient domain image processing, also called Poisson image editing, is a type of digital image processing that operates on the differences between neighboring pixels, rather than on the pixel values directly.
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Graphics software
In computer graphics, graphics software refers to a program or collection of programs that enable a person to manipulate images or models visually on a computer.
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Image derivatives
Image derivatives can be computed by using small convolution filters of size 2 x 2 or 3 x 3, such as the Laplacian, Sobel, Roberts and Prewitt operators.
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Image editing
Image editing encompasses the processes of altering images, whether they are digital photographs, traditional photo-chemical photographs, or illustrations.
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Map
A map is a symbolic depiction emphasizing relationships between elements of some space, such as objects, regions, or themes.
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Partial derivative
In mathematics, a partial derivative of a function of several variables is its derivative with respect to one of those variables, with the others held constant (as opposed to the total derivative, in which all variables are allowed to vary).
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Population density
Population density (in agriculture: standing stock and standing crop) is a measurement of population per unit area or unit volume; it is a quantity of type number density.
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Posterization
Posterization or posterisation of an image entails conversion of a continuous gradation of tone to several regions of fewer tones, with abrupt changes from one tone to another.
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Prewitt operator
The Prewitt operator is used in image processing, particularly within edge detection algorithms.
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Sobel operator
The Sobel operator, sometimes called the Sobel–Feldman operator or Sobel filter, is used in image processing and computer vision, particularly within edge detection algorithms where it creates an image emphasising edges.
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References
[1] https://en.wikipedia.org/wiki/Image_gradient
