Artifact (technology)
In measurement technology and other areas, an artifact is an inauthentic result caused by the properties of the method (example: escape lines in gamma spectra ). In telecommunications technology , artifact describes the effect of a system-related weak transmission on a useful signal ; it can occur when a signal is converted or the data contained therein is compressed at the expense of loss .
| Useful signal | System weakness | impact |
|---|---|---|
| Audio (cable transmission) | Insufficient shielding | Hum |
| Beats (whistles) | ||
| Audio (amplification) | Stochastic signal degradation | Noise |
| Feedback | Pipes | |
| Audio (playback) | Low speaker dynamics | Distortions |
| Audio (stereo playback) |
|
|
| Audio (digital storage) | Compression artifact | Pre-echo, post-echo, washed-out sound, inappropriate volume changes, changes in stereophony , rattling |
| Photography (recording) | Lens scattering | Stars and rings across the image ( lens flare ) |
| Exposure time> 0 | Blurring with a moving subject | |
| "Blurring" when the camera is moving | ||
| Photography, video (digital storage / transmission) | Compression artifact | Color distortions, wavy background, ringing , blurring , block artifacts, black and white contours, color contours |
| Video (television) | Stochastic signal degradation | "Snow" ( noise ) |
| Reflections during wireless transmission | “Shadows from edges”, double images | |
| Sonography , computed tomography (micro-CT, MRT , PET , SPECT ) | various causes | Ring artifacts , sources of diagnostic uncertainties |