Glossary

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Background Mode

A privacy technique in visual assistance technologies that obfuscates a specific private object while preserving all other elements in the image or video. For example, a user might select a pill bottle as private content, and background mode would blur or hide only the pill…

Biometric Authentication(also: Biometrics, Biometric Identification)

A security method that verifies a person's identity using unique biological characteristics such as fingerprints, facial features, iris patterns, or voice. For people with vision impairments, biometric authentication — particularly fingerprint recognition — is widely preferred…

Blockchain(also: Distributed Ledger, Distributed Ledger Technology, DLT)

A blockchain is a distributed, append-only digital ledger in which records (blocks) are cryptographically linked and replicated across a decentralized network of nodes. No single party controls the data; once written, records are extremely difficult to alter. In accessibility…

Browser Fingerprinting(also: Device Fingerprinting, Canvas Fingerprinting)

A technique used to identify and track users based on the unique characteristics of their web browser and device configuration, including installed plugins, screen resolution, fonts, and accessibility settings. Browser fingerprinting poses privacy concerns for assistive…

Busyness(also: Activity Level, Activity Intensity)

In the telecare literature, busyness is a coarse-grained measure of overall domestic activity — typically the count of ambient sensor firings per room per time period — used as a proxy for a resident's level of engagement with their home environment, without attempting to…

Bystander privacy(also: Third-party privacy, Incidental privacy)

The privacy concerns of people who are unintentionally captured or observed by technology being used by others. In the context of assistive technology, bystander privacy refers to the rights and concerns of sighted people who may be recorded, analyzed, or described by…

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