Face Authentication Device Using Diagonal Imaging Direction Detection
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Solution Overview
Problem
Conventional face authentication devices using portable terminals face challenges in preventing spoofing, as the imaging direction is easily changed, making it difficult to ensure secure authentication without burdening the user and increasing the risk of mistaken authentication.
Innovation Solution
An authentication device and method that includes an imaging unit, an imaging direction determining unit, and a determining unit to verify if the face is imaged from diagonally below, using a tilt detecting unit and image analyzing unit to determine the orientation of the face and prevent spoofing by ensuring the imaging direction is from diagonally below.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the imaging direction is fixed to prevent spoofing, then security is improved, but user convenience deteriorates due to the burden of maintaining constant imaging direction
Solution Approach 1:
The system automatically detects and determines the imaging direction without user intervention. The imaging direction determining unit self-activates to analyze the captured image and determine whether the face is imaged from diagonally below, eliminating the need for users to manually control or verify imaging angles.
Solution Approach 2:
The patent replaces manual mechanical control of imaging direction with automated image processing and analysis. Instead of requiring physical positioning, the system uses software-based detection of face orientation and imaging angle to automatically verify authentication conditions.
2Reliability
If the imaging direction is fixed to prevent spoofing, then authentication security is improved, but device complexity increases due to additional control requirements
Solution Approach 1:
The imaging direction determining unit performs multiple functions: it detects face orientation, determines imaging direction, and verifies authentication conditions all in one integrated process. This multi-functionality reduces the need for separate control mechanisms and simplifies the overall system architecture.
Solution Approach 2:
The system automatically determines imaging direction without external control inputs. The imaging direction determining unit self-activates based on the captured image data, eliminating the need for additional control interfaces, sensors, or manual positioning mechanisms.
3Ease of operation
If front-facing imaging is used for ease of operation, then user convenience is improved, but susceptibility to spoofing increases
Solution Approach 1:
The system preemptively prevents spoofing by determining the imaging direction before authentication is completed. The imaging direction determining unit analyzes the captured image to verify it was taken from diagonally below, blocking authentication attempts that don't meet this security criterion before they can succeed.
Solution Approach 2:
The patent changes the imaging angle parameter from front-facing (0 degrees) to diagonally below (specific angle range). By modifying this physical parameter of the imaging geometry, the system fundamentally alters the authentication condition to prevent spoofing while maintaining usability through automated detection.
Data Source
AI summary
An authentication device having high resistance to spoofing is provided. The portable telephone includes a camera of imaging the face of the person to be authenticated, an imaging direction comparing unit of determining whether or not the face of the person to be authenticated is imaged from diagonally below, and a main control unit of determining that the person to be authenticated is not the person in question when the imaging direction comparing unit determines that the face of the person to be authenticated is not imaged from diagonally below.