Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 52 of 333
- Caption (Image Caption, Figure Caption)
- In the context of image accessibility, a caption is text that describes or provides context for an image. Unlike alt text, which is typically hidden and read only by screen readers, captions are often…
- Caption Accuracy (Captioning Accuracy, Transcription Accuracy)
- A measure of how correctly captions represent the spoken content, typically expressed as the percentage of words that match the ground truth transcript. Caption accuracy is critical for deaf and hard …
- Caption Crawler (Reverse Image Search Alt Text)
- A technique and tool that retrieves existing alternative text for web images by performing reverse image searches to find the same image on other websites where it has already been described. Rather t…
- Caption Customization (Caption Personalization, Adaptive Captioning)
- The ability for viewers to adjust caption properties to match their individual preferences and needs. Caption customization can encompass visual attributes like font size, color, and positioning, as w…
- Caption Delay (Caption Latency, Synchronization Delay)
- The time lag between spoken audio and the appearance of the corresponding caption on screen. In live captioning, typical delays are around 5–6 seconds due to the time needed for captioners to hear, pr…
- Caption Density
- The amount of caption text displayed on screen relative to the available display time and screen space. High caption density—common in fast-paced scenes with many sound events—can overwhelm viewers by…
- Caption Flow (Captioning Flow, Text Flow)
- The smoothness and regularity with which caption text appears and updates on screen during real-time captioning. Good caption flow means text arrives at a consistent pace without jarring delays, sudde…
- Caption Highlighting (Text Highlighting in Captions, Keyword Highlighting in Captions)
- The visual emphasis of important words within video captions to help viewers quickly identify key concepts and reduce the cognitive load of reading dynamic text. Research with Deaf and Hard of Hearing…
- Caption Occlusion (Caption Blocking, Subtitle Occlusion)
- The phenomenon where captions or subtitles visually block or cover other important information displayed on a video screen. Caption occlusion is a significant accessibility concern for Deaf and Hard o…
- Caption Placement (Caption Positioning, Subtitle Placement)
- The decision of where captions or subtitles are positioned on a video screen, which significantly affects the viewing experience of Deaf and Hard of Hearing users. Poor caption placement can occlude i…
- 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,…
- Caption Readability
- The ease with which viewers can read and process caption text on screen, influenced by factors including font size, display duration, caption density, reading speed requirements, and competition with …
- Caption quality metric (ACE metric, Caption evaluation metric)
- A measure designed to predict how understandable automatically generated captions are for Deaf and Hard-of-Hearing users, as an alternative to standard Word Error Rate which correlates poorly with act…
- Captioned Telephone (CapTel, Captioned Phone)
- A telecommunications device that displays real-time captions of what the other party is saying during a phone call, enabling people who are hard of hearing to read the conversation while also listenin…
- Captioning (Captions, Closed captions, Subtitles for the deaf and hard of hearing, SDH)
- The conversion of spoken dialogue, sound effects, and other auditory information into synchronised text displayed alongside audiovisual content. Captioning makes audio content accessible to people who…
- Captioning (Captions, Subtitles for the Deaf and Hard of Hearing, SDH)
- The process of displaying synchronized text on screen that represents spoken dialogue, sound effects, and other audio information in video content. Unlike subtitles, captions are specifically designed…
- Captioning Key (DCMP Captioning Key)
- A set of guidelines and best practices for creating high-quality captions, most notably published by the Described and Captioned Media Program (DCMP). The Captioning Key covers standards for caption a…
- Captions (Subtitles, Text Captions)
- Text displayed on screen that represents the audio content of a video, including spoken dialogue and important sound effects. Captions are essential for deaf and hard of hearing viewers but also benef…
- Card Sorting (Card Sort)
- A user research and information architecture method in which participants organise items (written on cards or displayed digitally) into groups that make sense to them, and may also label those groups.…
- Care Ecosystem (Assistive Technology Ecosystem, AT Ecosystem)
- A network of interconnected stakeholders—including clinicians, makers, recipients, caregivers, and organizations—who collectively support the provision, customization, and maintenance of assistive tec…