anti-aliasing

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anti-aliasing

(graphics)
A technique used on a grey-scale or colour bitmap display to make diagonal edges appear smoother by setting pixels near the edge to intermediate colours according to where the edge crosses them.

The most common example is black characters on a white background. Without anti-aliasing, diagonal edges appear jagged, like staircases, which may be noticeable on a low resolution display. If the display can show intermediate greys then anti-aliasing can be applied. A pixel will be black if it is completely within the black area, or white if it is completely outside the black area, or an intermediate shade of grey according to the proportions of it which overlap the black and white areas. The technique works similarly with other foreground and background colours.

"Aliasing" refers to the fact that many points (which would differ in the real image) are mapped or "aliased" to the same pixel (with a single value) in the digital representation.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

anti-aliasing

(1) Smoothing the jagged appearance of diagonal lines in a bitmapped image. The pixels that surround the edges of the line are changed to varying shades of gray or color in order to blend the sharp edge into the background. This technique is also called "dithering," but is usually known as anti-aliasing when applied to diagonal and curved lines.

(2) Smoothing a distorted signal by applying various techniques that add data or filter out unwanted noise.


Anti-aliasing
This teapot from the University of Utah was a famous first example of anti-aliasing applied to images. (Images courtesy of Computer Sciences Department, University of Utah.)


Anti-aliasing
This teapot from the University of Utah was a famous first example of anti-aliasing applied to images. (Images courtesy of Computer Sciences Department, University of Utah.)
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References in periodicals archive ?
A simple tiled pyramid is created for each source image and the appropriate tile (or tiles) is automatically selected to cover each surface at an appropriate resolution for antialiasing. A deferred texturing, depth-buffer technique is used and various resampling techniques may be selected to trade quality versus speed, including supersampling and/or EWA on a pyramid.
Digital filter in device for real time measurement and analysis of recuperative currents from electric locomotive acts like antialiasing filter, which is basically low pass filter.
This solution ensures the advantage to use the same ADC for different frequency carriers, such as 163 MHz, 450 MHz, and 860 MHz, thus allowing a hardware cost saving and avoiding the use of a critical (relative bandwidth approaching to unity) antialiasing filter.
The design incorporates antialiasing and digital filters per channel, an independent programmable 0.625-V to 10-V excitation voltage on each channel, and remote sensing and shunt calibration options per channel.
The original sounds were sampled at a sampling frequency (FS) of 16,000 Hz, with an antialiasing filter just below 8,000 Hz.
First, light from a scene enters the camera through a lens and passes through a set of filters including an antialiasing filter.
The shading texts reviews the basics of the guide and offers chapters on the shading languages built-in functions, shader development, stored and procedural texture shaders, lighting, shadows, surface characteristics, noise, animation, antialiasing procedural textures, non-photorealisitic shaders, shaders for imaging, and language comparison.
-- Support for 32x full-scene antialiasing (FSAA) delivering superior image quality
memory bandwidth, more than twice the bandwidth of the industry-leading NVIDIA Quadro FX 2000, drives large texture performance and high-resolution, full-scene antialiasing.
* The degree of contrast between the type and its background, and the effects of antialiasing Antialiasing tricks the viewer's eye into seeing pixels where there aren't any in an attempt to improve on a monitor's inherent resolution.
The simulation model was embodied in C code and included modules for symbol antialiasing, simulation of subtractive-color diffraction effects, eliminating color channels selectively, and simulating the effect of aperture ratio on image luminance.
Antialiasing software removes jagged edges on curves and surfaces.