Iris Authentication Using Face Tilt Angle Adjustment

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Solution Overview

Problem

Existing iris recognition methods in electronic devices may fail to recognize a user's iris if the face is captured at a predetermined angle, leading to security vulnerabilities.

Innovation Solution

The method involves capturing a face image, analyzing it to determine the tilted angle between the iris images of the left and right eyes, and adjusting the rotational angle of the device using sensors like accelerometers and gyroscopes to modify the iris code for comparison with a pre-registered code, ensuring authentication even if the face is tilted.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the electronic apparatus uses a fixed-angle iris recognition method, then the recognition process is simple, but the recognition fails when the face is captured at a tilted angle

Engineering Contradiction:

Improveiris recognition accuracyVSAvoidrecognition process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by making the iris recognition system adaptable to different face angles. Instead of using a fixed recognition angle, the system dynamically adjusts the reference iris image angle based on the detected face tilt angle, allowing the recognition process to accommodate varying user positions while maintaining accuracy.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the angular parameter of the iris recognition system. By calculating the difference between the detected face angle and the reference image angle, and adjusting the reference iris image accordingly, the system modifies its operating parameters to maintain recognition accuracy under different conditions.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If the electronic apparatus captures face images at various angles, then the ease of operation improves, but the measurement precision of iris recognition deteriorates

Engineering Contradiction:

Improveuser authentication convenienceVSAvoidiris image extraction accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent implements feedback by detecting the actual face angle during capture, comparing it with the reference angle, and using this information to adjust the recognition process. The system continuously monitors the angular deviation and compensates for it by selecting or transforming the appropriate reference iris image, ensuring accurate recognition regardless of capture angle.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If the electronic apparatus moves iris images within a pre-defined angle range, then the device complexity is low, but the adaptability to different face angles is poor

Engineering Contradiction:

Improveface angle accommodationVSAvoidimage processing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-storing multiple iris images captured at different angles during the registration phase. When recognition is needed, the system selects the most appropriate pre-captured iris image based on the detected face angle, avoiding the need for complex real-time image transformation while maintaining adaptability to various angles.

Inventive Principle:

Principle #10Preliminary action

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

This approach allows for successful user authentication regardless of the angle at which the face is captured, enhancing security by ensuring accurate iris recognition.

Implementation Method 1

obtaining the rotational angle of the electronic apparatus by using a sensing value acquired through at least one of an acceleration sensor, a geomagnetic sensor and a gyro sensor included in the electronic apparatus

Methodology Applied

Scientific EffectAcceleration: Accelerometer

Implementation Method 2

Methodology Applied

Scientific EffectGeomagnetic field detection: Magnetometer

Implementation Method 3

Methodology Applied

Scientific EffectGyroscopic effect: Gyroscope

Data Source

PatentEP3968193A1Electronic device and control method thereof

Publication Date: 2022.03.16 SAMSUNG ELECTRONICS CO LTD

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Figure 4(a)~4(b)

AI summary

An electronic apparatus for authenticating a user thereof based on a face angle, a rotational angle of the electronic apparatus, a difference value between the face angle and the rotational angle and a modified face image.