Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 248 of 333
- Scalable Vector Graphics (SVG)
- An XML-based vector image format for two-dimensional graphics that supports interactivity and animation. Unlike bitmap formats (JPEG, PNG, GIF) which store images as grids of pixels, SVG describes sha…
- Scanning (Switch Scanning, Sequential Scanning)
- An input method used in augmentative and alternative communication (AAC) that allows users with severe motor impairments to make selections using one or more switches. The system sequentially highligh…
- Scanning (Switch Scanning, Automatic Scanning)
- An indirect selection method used in augmentative and alternative communication (AAC) and assistive technology where items (letters, words, or commands) are highlighted sequentially by the system, and…
- Scanning Delay (Tscan, Scan Rate, Dwell Time)
- The time interval a scanning system waits before automatically advancing to highlight the next item. Setting scanning delay appropriately is critical for switch access users: too short causes selectio…
- Scanning Navigation (Non-Visual Scanning, Auditory Scanning)
- A non-visual navigation strategy in which a screen-reader or voice-browser user steps rapidly through a page one fragment at a time — line by line, item by item, or in fixed jumps (e.g. page-down keys…
- Scanning Rate (Scan Rate, Scan Speed, Dwell Time)
- The speed at which options in a scanning interface are sequentially highlighted, typically measured in seconds per item. The scanning rate is a critical configuration parameter in switch-access system…
- Scanning System (Automatic Scanning, Group Scanning, Row-Column Scanning)
- An assistive technology input method in which selectable items are sequentially highlighted on screen, and the user activates a switch (or other simple input) when the desired item is highlighted. Sca…
- Scanning interface (Switch scanning, Single-switch access)
- An interaction method in which items on a screen are sequentially highlighted one at a time (or in groups), and the user activates a switch to select the currently highlighted item. Scanning interface…
- Scanpath (Gaze Path, Eye Movement Path)
- The sequence of fixations and saccades (rapid eye movements) that represent how a person visually explores an interface or document. In accessibility and usability research, scanpath analysis reveals …
- Scanpath Trend Analysis (STA)
- A method for analysing multiple eye-tracking scanpaths to identify a single representative trending path that captures the most common viewing patterns across a group of users. STA determines which vi…
- Scat Singing (Scatting, Vocal scat)
- A jazz-rooted vocal technique in which a singer improvises melodic and rhythmic lines using nonsense syllables (such as 'doo', 'bop', 'ba', 'da', 'shoo') rather than words. Scat lets the voice functio…
- Scatter Plot Accessibility
- The set of techniques and design considerations for making scatter plot data visualizations accessible to people with disabilities, particularly blind and low-vision users. Scatter plots present uniqu…
- Scenario-Based Evaluation (Path-Based Testing, User Journey Testing)
- An accessibility evaluation approach that assesses the complete user experience across a sequence of steps needed to accomplish a task, rather than testing individual pages in isolation. For example, …
- Scenario-based design (SBD, Scenario-driven design)
- A design methodology that uses narrative descriptions of how people interact with technology in specific contexts to drive the design process. Scenarios ground abstract requirements in concrete human …
- Scene Change Detection (Shot Boundary Detection, Scene Transition Detection)
- An automated technique for identifying transitions between different scenes or shots in video content by analyzing visual differences between consecutive frames. In audio description workflows, scene …
- Scene Classification (Scene Recognition, Scene Understanding)
- Scene classification is a computer vision task that categorizes images or video frames into predefined scene types such as indoor/outdoor, kitchen, office, or street. For accessibility, scene classifi…
- Scene Description (SD, Visual Description)
- A textual description of the visual elements in a video scene — including objects, people, settings, actions, and visual cues — that can be converted into audio through text-to-speech technology. Scen…
- Scene Reading (Scene Reader, 3-D Screen Reading)
- An interaction paradigm that extends touch-based screen reading concepts from 2-D interfaces to 3-D virtual environments, enabling blind and low vision users to explore virtual scenes nonvisually. Sce…
- Scene Segmentation (Scene Detection, Shot Boundary Detection)
- Scene segmentation is the process of automatically dividing a video into discrete scenes or segments based on visual changes such as cuts, transitions, or the appearance of new elements in the frame. …
- Scene Text Recognition (Scene Text Detection, Text in the Wild, Environmental Text Detection)
- The computer vision task of detecting and reading text that appears naturally in real-world environments, such as street signs, product labels, shop names, and building numbers. Unlike optical charact…