Handscanner

A handscanner is a device used to capture biometric data from the hand for identification, authentication, or measurement. The term covers a range of technologies, including palmprint scanners, which record the unique line patterns on the palm; hand geometry scanners, which measure length, width, and curvature; and 3D hand scanners, which generate a three-dimensional representation of the hand. Some devices are designed for contact use, while others are non-contact and rely on infrared or stereo imaging.

Data from the hand is processed to create a biometric template that is stored in a secure database and compared with new samples for matching. Systems are commonly used in access control for offices and facilities, time-and-attendance solutions, and border or law-enforcement applications. In research and industry, hand scanners support ergonomic studies, rehabilitation, and prosthetics design.

Technology varies by type: palmprint scanners often use optical sensors or capacitive arrays; 3D systems use structured light or time-of-flight. The choice of technology affects accuracy, speed, and environmental resilience. Typical performance is measured by false acceptance and false rejection rates and the system's ability to operate with moisture, dirt, or pressure.

Limitations and concerns include privacy, data security, and the potential for spoofing with fake prints or molded hands; hygiene concerns with shared devices; and variability due to skin conditions, injuries, or age. As with other biometrics, hand scanners are usually one part of a broader identity-management strategy, often used in combination with other factors.