# US 2019/0172281 A1 · Method and system for automated physical access control system using biometric recognition coupled with tag authentication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0172281 A1 - Document ID: US20190172281A1 - Status: Published application - Kind: A1 - Application number: 16/323,199 - Filed: 2017-08-07 - Published: 2019-06-06 - Earliest claimed: 2016-08-05 - Assignees: Assa Abloy AB - Applicants: Assa Abloy AB - Inventors: Fredrik Einberg; Phillip Hoyer; Julian Lovelock; Robert Rowe - Web page: https://patentgrep.com/patent/US20190172281A1 ## CPC - G07C 9/257: {electronically (G07C9/26 takes precedence)} - G06F 3/013: {Eye tracking input arrangements (G06F3/015 takes precedence)} - G06V 40/166: {using acquisition arrangements} - G07C 9/00563: {using personal physical data of the operator, e.g. finger prints, retinal images, voicepatterns} - G07C 9/00571: {operated by interacting with a central unit} - G07C 9/27: with central registration - G07C 2209/63: Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle - G07C: TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract An access control system is described along with a method for operating the system. In one example, a system and method are disclosed that provide a hands-free solution thereby enabling a user to walk through a door or portal with no stop in motion and limited to no interaction or user effort. Security of the system is still maintained even though user interactions are significantly decreased. ## Claims ### Claim 1 A physical access control system, comprising: a biometric sensor mounted in proximity to a physical access control point; and a reader comprising: an antenna that enables the reader to wirelessly communicate with one or more access control credentials; a processor coupled to the antenna; and memory coupled to the processor that stores instructions thereon that are executable by the processor, the instructions comprising: instructions that determine an estimated spatial relationship between an access control credential within read range of the antenna and the reader; instructions that use the estimated spatial relationship to reduce a number of biometric templates that are analyzed by the processor in connection with determining whether or not a carrier of the access control credential is allowed to gain entry through the physical access control point, wherein the number of biometric templates are reduced from N templates to at least N-1 templates; and instructions that perform a comparison of biometric information obtained via a biometric sensor with one or more biometric templates in the reduced number of biometric templates. ### Claim 2 (depends on 1) The physical access control system of claim 1, wherein the biometric templates comprise facial templates. ### Claim 3 (depends on 1) The physical access control system of claim 1, wherein at least some of the biometric templates are stored in cache memory of the reader. ### Claim 4 (depends on 1) The physical access control system of claim 1, wherein the biometric templates comprise one or more of retina templates, infrared signature templates, weight templates, iris templates, sclera templates, body shape templates, and gait templates. ### Claim 5 (depends on 1) The physical access control system of claim 1, wherein the estimated spatial relationship comprises an estimated distance between the access control credential and the reader. ### Claim 6 (depends on 5) The physical access control system of claim 5, wherein the estimated distance is determined using at least one of RSSI and ToF. ### Claim 7 (depends on 5) The physical access control system of claim 5, wherein the estimated spatial relationship further comprises an angle of arrival between the access control credential and the reader as measured by radio signals exchanged between the access control credential and the reader. ### Claim 8 (depends on 7) The physical access control system of claim 7, wherein the instructions further include instructions that determine a user's intent to enter the physical access control point in connection with determining whether to analyze an access control credential being carried by the user. ### Claim 9 (depends on 1) The physical access control system of claim 1, wherein a biometric template for a first user is stored on the access control credential and then is initially transmitted to the reader upon a first presentation of the access control credential to the reader and wherein the biometric template for the first user is then stored in cache memory of the reader after receiving the biometric template for the first user from the access control credential. ### Claim 10 (depends on 1) The physical access control system of claim 1, wherein the access control credential comprises a mobile communication device and wherein the antenna enables communication via a proximity-based communication protocol. ### Claim 11 (depends on 10) The physical access control system of claim 10, wherein the proximity-based communication protocol comprises Bluetooth. ### Claim 12 (depends on 1) The physical access control system of claim 1, wherein the instructions further include instructions that obtain at least one credential identifier (ID) from the access control credential and correlate the at least one credential ID to a template in the N-1 templates. ### Claim 13 A method of maintaining security of a door and permitting an automated actuation of the door with a reader, the method comprising: determining an estimated spatial relationship between an access control credential and the reader; based on the estimated spatial relationship and an access control identifier (ID) communicated to the reader by the access control credential, selecting one or more templates from a database that contains a plurality of templates, wherein a number of templates in the selected one or more templates is less than the plurality of templates; obtaining biometric information for a user that is approaching the reader; comparing the obtained biometric information with only templates belonging to the selected one or more templates; based on the comparison, determining that the biometric information satisfies a template belonging to the selected one or more templates; and in response to determining that the biometric information satisfies the template, allowing the reader to automatically actuate the door or a component of the door. ### Claim 14 (depends on 13) The method of claim 13, wherein the plurality of templates comprises facial templates and wherein the obtained biometric information comprises an image of the user captured with a camera having a field of view that at least partially coincides with a read range of the reader. ### Claim 15 (depends on 13) The method of claim 13, further comprising: storing the template in cache memory of the reader for a predetermined amount of time or until a predetermined event occurs; and after the predetermined amount of time has expired or the predetermined event has occurred, causing the template to be removed from the cache memory. ### Claim 16 (depends on 13) The method of claim 13, further comprising: determining the user's intent to enter the door before comparing the obtained biometric information with the templates belonging to the selected one or more templates. ### Claim 17 (depends on 13) The method of claim 13, further comprising: assigning the user a pending access grant status in response to determining that the biometric information satisfied the template belonging to the selected one or more templates; waiting for the user to exhibit an intent to enter the door; and only after determining that the user has exhibited an intent to enter the door, allowing the reader to automatically actuate the door or the component of the door. ### Claim 18 (depends on 17) The method of claim 17, wherein the user is determined to exhibit an intent to enter the door by moving within a predetermined distance of the door, by following a path directed toward the door, or by gaze detection. ### Claim 19 (depends on 17) The method of claim 17, wherein the user's intent to enter the door is measured, at least in part, by a size of the user's face, a number of pixels between the user's eyes, a number of pixels populated by the user's face, or by the determined estimated spatial relationship between an access control credential and the reader. ### Claim 20 (depends on 12) The method of claim 12, further comprising: re-reading the template from the access control credential each time the user approaches the reader with the access control credential.