For Aliasing we have terms and definitions in 18 topics. The topics are Audio Technology, Camcorder, Cinematography, DTV, DVD, DVD and CD, Digital Imaging, Electronic Cinematography, Film Production, Graphic Design, Import Cars, Music Technology, Photography, Publishing, Real Time 3D, Scanner, Technical Illustration and Typography.

Aliasing (Audio Technology)

An effect that occurs when an analog signal is digitally sampled. See the graphical example of 44,100 Hz sampling [by coincidence, 44.1 kb]. Samples (black circles) of a 10,000 Hz tone are identical to samples of a 34,100 tone. In general, samples of a tone of frequency f are identical (except for a phase shift) to samples of a tone of frequency Fs - f, where Fs is the sampling rate. Thus if f equals, say Fs/2 + f0, the digital recording will produce a false tone of Fs/2 - f0. Anti-aliasing filters are used to eliminate tones above Fs/2 to avoid this effect. See the Signal Processing Section for more detail.

Aliasing (Camcorder)

The jagged, stepped lines that appear on computer generated images, due to pixilation.

Aliasing (Cinematography)

An undesirable distortion component that can arise in any digitally encoded information (sound or picture).

Aliasing (DTV)

Defects or distortion in a television picture or audio. Defects are typically seen as jagged edges on diagonal lines and twinkling or brightening. In digital video, aliasing is caused by insufficient sampling or poor filtering of the digital video.

Aliasing (DVD)

A distortion (artifact) in the reproduction of digital audio or video that results when the signal frequency is more than twice the sampling frequency. The resolution is insufficient to distinguish between alternate reconstructions of the waveform, thus admitting additional noise that was not present in the original signal.

Aliasing (DVD and CD)

A distortion (artifact) in the reproduction of digital audio or video that results when the signal frequency is more than twice the sampling frequency. The resolution is insufficient to distinguish between alternate reconstructions of the waveform, thus admitting additional noise that was not present in the original signal.

Aliasing (Digital Imaging)

In graphic imaging, the undesirable components resulting from the combination of signals or inadequate preparation of signals prior to digitization.

Aliasing (Electronic Cinematography)

Defects in a TV picture typically caused when the original signal is sampled at too low a rate by sampling at a frequency below the Nyquist limit. Poor filtering of digital video produce these spurious waveforms. These erroneous signals or artifacts are typically seen as jagged steps on diagonal lines and twinkling or brightening of the picture detail.

Aliasing (Film Production)

An undesirable distortion component that can arise in any digitally encoded information (sound or picture).

Aliasing (Graphic Design)

The term is commonly applied to spatial aliasing, which manifests as visible pixelation - a blocky or jagged effect - especially with near horizontal or near vertical lines of high contrast.

Aliasing (Import Cars)

Aliasing occurs when a digital oscilloscope does not take enough samples on a particular signal. After the scope reconstructs and displays the waveform you can be "Fooled" into seeing a false waveform.

Aliasing (Music Technology)

See Nyquist Theorem .

Aliasing (Photography)

When a line or any shape (curve, circle or font text character) is painted, and its edges are not perfectly horizontal or vertical, some pixels are only partially covered. The resulting jagged-edged lines are said to be aliased. Aliasing gives lines a "stair-step" or "jaggie" appearance. The greater the number of dots or pixels on your display, the higher the display resolution, and the less noticeable aliasing is to the human eye.

Aliasing (Publishing)

Visual artifacts produced in graphics images that use pixels for display. One example of aliasing is jagged edges on curved lines.

Aliasing (Real Time 3D)

When edges look jagged instead of smooth, and moiré patterns develop in fine parallel lines. The problem is most prevalent in diagonal lines. Aliasing happens when the engine tries to display an image on a portion of the screen where the resolution is too low to display its details correctly. This is solved with anti-aliasing, MIP mapping, or texture filtering.

Aliasing (Scanner)

Visibly jagged steps along angled lines or object edges, due to sharp tonal contrasts between pixels.

Aliasing (Technical Illustration)

(v) Condition when bitmapped or vector graphics showjagged edges under magnification.

Aliasing (Typography)

Visual artifacts produced in graphics images that use pixels for display. One example of aliasing is jagged edges on curved lines.

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