PRODUCT HAVING ENCODED AUTHENTICATION WRITING AREAS

摘要

A product is provided which has a plurality of coded tags and at least one authentication writing area defined by at least some of the coded tags for receiving handwritten authentication information from a sensing device operated by a user. Each coded tag encodes coordinates for a point on a tag map and an orientation feature. The orientation features enable the sensing device to determine a planar orientation of each tag relative to a yaw of the sensing device.