Glossary
Searchable terminology from accessibility, web standards, and related fields.
25 results found in Video Accessibility.
- Automatic Captions (Auto-Generated Captions, Auto Captions, ASR Captions)
- Captions produced by automatic speech recognition (ASR) systems without human transcription, typically generated by the hosting platform (e.g., YouTube, Zoom, Microsoft Teams) as an optional layer on …
- CEA-708 (CTA-708, EIA-708, Digital Closed Captioning)
- A US standard for digital closed captioning on digital television broadcasts and streaming, superseding the analog-era CEA-608 standard. CEA-708 supports richer presentation than its predecessor, incl…
- Caption Quality (Subtitle Quality)
- The overall fitness of a set of captions or subtitles for their intended accessibility purpose. Quality is multi-dimensional: it includes text accuracy (whether spoken words are correctly transcribed,…
- Chroma Key (Green Screen, Blue Screen, Chroma Keying)
- A video-post-production technique in which a solid, uniformly coloured background (often green or blue) is replaced with another image, video, or transparency using colour-matching software. In access…
- Educational Video (Instructional Video, Video Lecture)
- Video content created to teach - including talking-head lectures, screencasts, animations, hand-drawn (Khan-style) explanations, recorded classroom sessions, programming/coding demonstrations, intervi…
- Frame Rate (Frames Per Second, FPS, Frame Frequency)
- Frame rate is the number of still images (frames) displayed or captured per second in a video stream, usually measured in frames per second (fps). Common values include 24 fps (cinema), 30 fps (US bro…
- Lecture Capture (Lecture Recording, Classroom Recording)
- The process of recording classroom lectures, presentations, or educational sessions using video, audio, and screen capture technology for later review by students. Lecture capture systems range from s…
- Momentous Depiction
- A conceptual framework proposed by Niu, Clements, and Kim (2026) for using generative AI to visualize critical moments that convey the insights and meanings of disability in storytelling videos. The f…
- Motion Design (Motion Graphics, Motion-Driven Design)
- The practice of animating graphic elements - text, icons, diagrams, captions - in time-based media to communicate instructional content. In accessible educational video, motion design is used to guide…
- NER Model (Number, Edition, Recognition Model, NER Accuracy Model)
- A caption-quality evaluation model developed by Pablo Romero-Fresco and Juan Martínez Pérez for measuring the accuracy of live subtitling and respeaking. Unlike Word Error Rate, which penalises all er…
- Non-diegetic Sound (Non-diegetic Audio, Extradiegetic Sound)
- Sound in film, television, or games that does not originate from any source within the story world and cannot be heard by the characters - for example, orchestral score, voice-over narration, or added…
- Participatory Captioning
- A framework proposed by Nguyen et al. (2026) that characterises social media video captioning as a collaborative, community-sustained infrastructure co-produced by viewers, creators, and platforms — r…
- Signer (Sign Language User, Signing Person)
- A person who communicates using sign language. In accessibility contexts, signers may be deaf, hard of hearing, or hearing individuals (such as interpreters, children of deaf adults, or others who hav…
- Social Media Video Captions (SMVC)
- An umbrella term for the textual or symbolic elements — platform-generated captions, creator-edited captions, user-generated captions, and non-speech information such as sound effects, music cues, or …
- Sound Design (Audio Design)
- The craft of creating, selecting, and arranging audio elements - dialogue, music, ambient sound, foley, and effects - to shape the experience of a film, game, broadcast, or interactive product. For ac…
- Spatiotemporal Saliency (Spatiotemporal Saliency Estimation, Spatio-Temporal Saliency)
- A computer vision technique that estimates, for each pixel in a video, how visually important it is at a given moment by combining spatial contrast (features that stand out within a frame) with tempor…
- Subtitle (Subtitles, Open captions (video), Movie subtitles)
- On-screen text that reproduces the spoken dialogue of a video, most commonly rendered in a "movie subtitle" style (white text with a black outline, one or two lines at the bottom of the frame). Subtit…
- Synthesized Video Description (TTS Video Description, Text-to-Speech Description, Synthesized Audio Description)
- An audio description for video content that is generated using text-to-speech (TTS) technology rather than recorded by a human narrator. A describer writes a text script describing the visual elements…
- Talking-Head Video (Talking Head)
- A common educational video format in which a presenter speaks directly to the camera, typically filling the frame, with no or few accompanying visuals. For d/Deaf and Hard-of-Hearing learners, talking…
- Text-to-Sound (Text-to-Audio, TTA, Sound Generation from Text)
- A class of generative AI models that synthesize non-speech audio - sound effects, ambient environments, foley, or short music clips - from a natural-language description such as 'a door creaking shut'…