Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 64 of 333
- Collaborative virtual environment (CVE, Shared virtual space)
- A computer-based distributed virtual space where multiple users can interact with one another and with virtual objects in real time from separate physical locations. For children with autism, CVEs off…
- Collective Communication Access (CCA)
- A framework developed by McDonnell et al. (2023) that reconceptualises communication access as a shared, co-constructed practice distributed across everyone involved in an interaction, rather than as …
- Collective Quality Control (Community Quality Control, Crowdsourced Quality Assessment)
- The process by which online communities collectively monitor, assess, and improve the quality of shared content through comments, ratings, corrections, and supplementary information. In disability com…
- Collective access (Collective communication access)
- A disability justice concept that frames accessibility as a shared, relational practice created by a group rather than an individual accommodation delivered to one person. In contrast to traditional m…
- Collision Avoidance (Obstacle Avoidance, Anti-Collision System)
- A safety feature in assistive technology, robotics, and intelligent wheelchairs that automatically detects obstacles in the user's path and takes action to prevent impact — typically by stopping the d…
- Collision Detection (Contact Detection, Intersection Testing)
- In virtual reality and haptic systems, collision detection is the computational process of determining when virtual objects come into contact with each other or with a user's virtual representation (s…
- Collision Prediction (Collision risk prediction, Trajectory prediction)
- The task of estimating the future trajectories of surrounding pedestrians and obstacles and determining whether any of them will intersect with a user's own future position within a short prediction h…
- Color Adaptive Graphics (Colour Adaptive Graphics)
- A technique for automatically adjusting the colours in graphical content so that objects maintain similar colour contrast relative to their reference background colours, regardless of the viewing cont…
- Color Blindness (Color Vision Deficiency, CVD, Colour Blindness)
- A condition in which the ability to distinguish certain colors is reduced or absent, most commonly affecting the perception of red and green. Color blindness affects approximately 8% of males and 0.5%…
- Color Contrast (Colour Contrast, Contrast Ratio)
- The difference in luminance between foreground text (or UI components) and their background, measured as a ratio. WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large …
- Color Filter (Color Filters, Display Color Filter)
- An operating-system or browser-level feature that alters how colors are rendered on screen, including grayscale, inverted colors, and filters for protanopia, deuteranopia, and tritanopia color vision …
- Color Gamut (Colour Gamut, Gamut)
- The complete range of colours that can be represented or reproduced by a particular colour space, display device, or visual system. In the context of colour vision, a trichromat's gamut encompasses th…
- Color Histogram (Colour histogram, Histogram tracking)
- A statistical summary of the distribution of colour values across the pixels of an image or image region, often computed in a perceptual colour space such as Lab. In assistive computer-vision systems …
- Color Identifier (Color Detector, Color Recognition Device)
- A color identifier is an assistive technology device or application that detects and announces the color of objects for people with vision impairments. Standalone hardware devices use a light sensor p…
- Color Perception (Color Vision, Chromatic Vision)
- Color perception is the ability to detect, distinguish, and identify colors. Impairments in color perception range from complete color blindness (achromatopsia) to partial deficiencies in distinguishi…
- Color Sonification (Colour Sonification, Color-Audio Encoding)
- The process of translating colour information into audible sound signals, enabling people who are blind or have visual impairments to perceive colour through hearing. Color sonification systems typica…
- Color Space (Colour Space, Color Model)
- A mathematical model that describes the range of colours that can be represented as numerical values, typically using three or more coordinates. Common colour spaces include RGB (red, green, blue), us…
- Color Theory (Colour Theory)
- A body of principles and guidelines for understanding how colors interact, combine, and affect perception. In accessibility contexts, color theory is important for ensuring sufficient contrast ratios,…
- Color Universal Design (CUD, Colour Universal Design)
- A set of guidelines and principles developed to ensure that colour use in designs, products, and environments is accessible to people with all types of colour vision, including those with colour visio…
- Color Vision Deficiency (Color Blindness, CVD, Colour Blindness)
- A condition in which a person has difficulty distinguishing between certain colors, most commonly red and green (deuteranopia/protanopia), but also blue and yellow (tritanopia) or all colors (achromat…