The city of Boston spent $650,000 to test surveillance software during last year’s Boston Calling music festival, using the technology to record the crowds of concertgoers without their knowledge.

No similar surveillance at public events — including this past weekend’s Boston Calling festival — is scheduled, a city spokeswoman said. But she acknowledged that future tests of systems with similar capabilities may also be done without notifying those being recorded.

Systems like the one tested by Boston can be used for many purposes, including everything from alerting police to abandoned bags to sorting people by height or skin color.

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