Following up on Sunday’s piece on biometrics, a report in the Register points out the weaknesses in facial recognition software. Even in controlled settings you would get a false acceptance rate (FAR) of one in 250, and in uncontrolled settings (surveillance cameras) it drops to absurdly poor levels: “With indoor light, and a prior image taken at 1.5m camera-subject separations and another taken at 2m camera-subject separations, the best false detection rate (FDR) was 33 per cent, with a false acceptance rate (FAR) of ten per cent.” This means that “to detect 90 per cent of terrorists we’d need to raise an alarm for one in every three people passing through the airport.”
2 October 2001
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