Access control systems

This invention describes an access control system that uses an optical sensor to scan an object. The object has invisible, machine-readable information, like a digital watermark, which includes an identifier and a specific sequence of orientations. An electronic processor reads this sequence and compares it to a stored, expected sequence to determine whether to grant access.

Why it matters: Filed before the widespread availability of high-resolution, low-cost optical sensors and powerful embedded processors. Modern computer vision and digital watermarking algorithms can now efficiently detect and interpret complex orientation sequences from objects in real-time, making this approach more practical.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: SpecializedDigital watermarking detection software, specialized sensor.

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