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The Department of Homeland Security (DHS) and the United States Visitor and Immigrant Status Indicator Technology (US-VISIT) program is preparing to transition from a two print capture process to a 10-print slap capture process. In preparing for the 10-print pilot testing, a concern that the existing counters that house the fingerprint scanners are too tall to support the ten print collection process was identified. Lowering the counters in the facilities is not possible for the pilot testing. However, angling the scanners on the counter may alleviate the problems. US-VISIT asked the National Institute of Standards and Technology (NIST) Biometrics Usability team to examine the impact on fingerprint capture performance of angling the fingerprint scanners on the existing counter heights to accommodate the upcoming pilot testing. The NIST Biometrics Usability group's study 1 was specifically designed to answer the question: Given the current counter heights in US-VISIT facilities, what is the " best " angle to position the fingerprint scanner? The study included three metrics: 1. Efficiency – the time to complete the tasks. Does the angle of the fingerprint scanner affect the time required to capture fingerprint images? 2. Effectiveness – how good are the prints? Does the angle affect the quality of the captured images? 3. Satisfaction – comfort. Do users prefer a particular fingerprint scanner angle? The installed base of counter heights at the US-VISIT facilities ranged from 83.9 cm (33 in.) to 124.5 cm (49 in.). Previous research on work surface heights and fingerprint capture recommended a counter height of 91.4 cm (36 in.). This experiment was designed to test the taller counter heights, specifically the most common counter height of 39 in., the tallest counter height of 49 in. and the midpoint of 114.3 cm (45 in.). Two fingerprint scanners were also provided by US-VISIT, each had a height of 15.2 cm (6.0 in.). The experimental procedure is summarized as follows. One-hundred and twenty-six NIST employees participated in the experiment. Each participant was instructed to complete five tasks: left slap followed by left thumb, right lap followed by right thumb, and both thumbs simultaneously. Fingerprint images were collected from each participant at the four different angles for one counter height (i.e. the experimental design for angle was within subject and 1 These tests were supported by the Department of Homeland Security. Specific hardware and software products identified in this report were used in order to perform …

Usability testing of height and angles of ten-print fingerprint capture