Cameras fixed on Spot will scan the surroundings and help officers work out the number of visitors in the park, but they cannot read faces and won't collect any personal information.
More on Time.com: A Five-Minute Brain Scan Tracks Kids' Development and May Spot Disorders
更多信息在Time.com:五分钟大脑扫描追踪孩子成长的精神活动以及可能失调的情况
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In this paper analyzes and demonstrates two problems in the experiment of using oscillograph:one is the function of triggering level, the other is why the horizontal scanspot moves in uniform motion.