Mobile Credential Verification Using IMU-Video Correlation

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Solution Overview

Problem

Existing physical access control systems face challenges in accurately matching mobile device-based credentials to specific individuals, especially in crowded scenarios, to ensure seamless access control.

Innovation Solution

Utilizing inertial measurement units (IMUs) in mobile devices to correlate motion data with video analysis, enabling precise identification of the credential holder through correlation techniques and machine learning algorithms, allowing access control systems to differentiate between individuals based on their IMU and video features.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If mobile device-based credentials are used for seamless access control, then access speed and convenience are improved, but the ability to accurately match credentials to specific individuals deteriorates in crowded scenarios

Engineering Contradiction:

Improveseamless accessVSAvoidcredential-to-person matching accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent combines multiple data sources (video stream analysis, IMU sensor data, and credential information) into a unified matching system. The verification device integrates these diverse data types to correlate motion patterns from video with motion patterns from IMU sensors, creating a robust method for identifying credential holders in crowded environments where visual identification alone is insufficient.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces IMU sensor data as an intermediary between the video stream and credential validation. The IMU sensors capture motion characteristics of the credential device, which then serve as a bridge to match with corresponding motion patterns in the video stream, enabling accurate identification without direct visual confirmation of the person holding the credential.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If multiple people try to enter simultaneously in crowded conditions, then access throughput increases, but the reliability of identifying the correct credential holder decreases

Engineering Contradiction:

Improveaccess throughputVSAvoidcredential holder identification accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system continuously monitors and compares motion patterns from IMU sensors with corresponding video stream data in real-time. This feedback loop allows the verification device to dynamically track and identify the correct credential holder even as multiple people attempt access simultaneously, maintaining reliability while enabling high throughput by continuously validating credentials against observed motion patterns.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent employs dynamic motion pattern analysis rather than static identification. The system adapts to changing conditions by continuously analyzing motion characteristics of both the credential device and persons in the video stream, allowing it to track individuals through crowded environments and maintain accurate identification despite varying crowd densities and movement patterns.

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables accurate and efficient matching of mobile device credentials to specific individuals, ensuring seamless access control even in crowded conditions by correlating IMU data with video features, thereby enhancing security and efficiency.

Implementation Method 1

The verification device receives inertial measurement unit (IMU) information from the credential device

Methodology Applied

Scientific EffectInertial measurement: Accelerometer

Data Source

PatentUS20250371911A1Systems and methods for determining possession of mobile devices holding digital credential

Publication Date: 2025.12.04 HID GLOBAL CORP

AI summary

A method of operating a seamless physical access control (PAC) system includes receiving, by a verification device of the PAC system, credential information from a credential device; receiving inertial measurement unit (IMU) information from the credential device; receiving video data from another device different from the credential device, the video data including images of one or more persons; and correlating movement of the one or more persons detected in the video data with the received IMU information to identify a person in the video data as a holder in possession of the credential device.