Happily, says Mr Harvey. although face recognition is spreading, it is not yet ubiquitous － or perfect. A study by researchers at the University of Essex, published in July, found that although one police trial in London flagged up 42 potential matches, only eight proved accurate. Even in China, says Mr Harvey, only a fraction of CCTV cameras collect pictures sharp enough for face recognition to work.
Fooling Big Brother －The Economist August 17th 2019 生体認識(顔認識)からの防御
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