§ Slick Engineering · Glossary
The terms behind the
measurements.
Plain-language definitions for the standards-based terms behind Slick Engineering's measurement and clearance tools — quoted verbatim from the source where one exists, never paraphrased.
Flicker
- EU Ecodesign SLR
Commission Regulation (EU) 2019/2020 — the Single Lighting Regulation under the Ecodesign framework — sets ecodesign requirements for light sources and separate control gear placed on the EU market…
- Flicker index
Flicker index is a unitless number from 0 to 1 that captures both the amplitude and the waveform shape of light modulation. It is the area of the waveform above the mean divided by the total area u…
- IEC TR 61547-1:2015
IEC TR 61547-1:2015 is the international Technical Report that defines a standardized light flickermeter — a model of human perceptual response to light flicker. It produces PstLM, a single-scalar …
- IEEE 1789-2015
IEEE 1789-2015 is an IEEE recommended practice that defines low-risk and no-effect frequency / modulation-depth thresholds for current modulation in high-brightness LEDs. It is the most widely cite…
- IES TM-30
IES TM-30 is the modern IES method for evaluating color rendition of a light source. It supersedes the older CRI (Color Rendering Index) by reporting two scalars (Rf — fidelity, Rg — gamut) compute…
- PAVM
PAVM is a perceptual metric for the phantom-array effect — the chain of bright dots that appears when a viewer moves their eyes across a high-frequency-modulated light source. It targets the band a…
- Percent flicker
Percent flicker is the relative variation in light output of a source over one full modulation cycle, expressed as a percentage. 0% means no flicker; 100% means the light fully turns off and back o…
- PstLM
PstLM is a single-scalar perceptual metric for how annoying flicker from a light source is to a static human observer. PstLM = 1.0 corresponds to the visibility threshold — the level at which an av…
- SVM
SVM is a perceptual metric for the stroboscopic effect — the apparent stuttering or jagged motion of a moving object under modulated light. It targets the 80 Hz – 2 kHz band, where flicker is no lo…
- TLA
TLA is the umbrella term for visual artifacts produced by temporal modulation of a light source — covering directly-visible flicker, the stroboscopic effect on moving objects, and the phantom-array…
Thermal
- FLIR ONE
FLIR ONE is Teledyne FLIR's family of consumer / prosumer thermal cameras that attach to a phone. Three models exist: FLIR ONE Classic (USB-C tethered), FLIR ONE Edge (Wi-Fi), and FLIR ONE Edge Pro…
- Radiometric capture
Radiometric capture is thermal imaging in which each pixel stores the actual measured temperature value (a real number in degrees) rather than just a visual color from a thermal palette. It is the …
Brand clearance
- Common-law trademark
A common-law trademark is an unregistered mark that becomes enforceable through actual use in commerce, without any registration filing. Protection is geographically limited to where the mark is ac…
- Nice class
Nice Classification is the international system that organizes goods and services into 45 classes (1–34 for goods, 35–45 for services) for the purpose of trademark registration. It was established …
- USPTO TESS
USPTO TESS — recently rebranded as Trademark Search — is the U.S. Patent and Trademark Office's free public database of every federal trademark application and registration. Anyone can search live …
Imaging
- Eulerian video magnification
Eulerian video magnification is a computer-vision technique that amplifies imperceptibly small motions and color variations in a video — for example, the subtle skin-color pulse caused by blood flo…
- Phase-based motion magnification
Phase-based motion magnification is the successor to Eulerian motion magnification (2012). It uses complex-valued steerable pyramids to encode motion as phase variation in spatial-frequency coeffic…
More terms in development.
The glossary is growing. If a term we cite in a product page isn't here yet, we'll get to it — we hand-curate each entry to make sure the verbatim quotes match the source.