Body Part Imaging With Doctored Video Feedback Against Replay
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Solution Overview
Problem
Existing imaging devices for constructing three-dimensional models or authenticating users are not intuitive, tedious for users, and can be deceived by replay of previous recordings, often requiring multiple cameras, which are bulky and expensive.
Innovation Solution
A method involving a video-capturing device and display screen that modifies image positioning to guide users into correct body part alignment through doctored video feedback, ensuring self-correction and reliable authentication without perceivable anti-replay methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple cameras are used to image body parts from various viewing angles, then the completeness of three-dimensional imaging is improved, but the device complexity and cost increase
Solution Approach 1:
The patent uses a single camera that captures images at multiple time points as the user performs head movements, rather than using multiple static cameras. This dynamic approach allows the system to acquire images from various viewing angles sequentially, achieving complete three-dimensional imaging data while maintaining a simple single-camera configuration
Solution Approach 2:
The patent adds the time dimension to the imaging process by capturing images at multiple time points during user movement. This transforms a spatial problem (needing multiple cameras for different angles) into a temporal solution (one camera capturing different angles at different times), thereby achieving three-dimensional imaging completeness without increasing camera quantity
2Reliability
If the user must follow a target or reproduce movements to register, then the reliability of authentication is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent displays captured images on a screen in real-time, providing visual feedback to the user about their current head position relative to the required positions. This feedback mechanism guides users through natural head movements to achieve the necessary viewing angles, making the authentication process intuitive and easy to operate while maintaining reliability
Solution Approach 2:
The system allows users to perform natural head movements (looking up, down, left, right) to complete the imaging process without requiring them to follow complex instructions or reproduce specific movements. The visual feedback enables users to self-guide their movements, making the process intuitive and eliminating the need for tedious target-following tasks
3Ease of operation
If the same movements are always required for authentication, then the ease of operation is improved, but the reliability deteriorates due to replay attacks
Solution Approach 1:
The patent requires users to perform dynamic head movements to specific positions rather than static poses or repeated identical movements. The system captures images at multiple predetermined positions during natural head motion, making replay attacks difficult while maintaining operational simplicity through visual guidance
Solution Approach 2:
The system structures the authentication process as a periodic sequence of head movements through multiple predetermined positions. Users must sequentially move their heads to different positions (up, down, left, right) to capture the required images, creating a structured movement pattern that is easy to follow but resistant to replay attacks
Data Source
AI summary
The invention relates to a method for imaging a body part of a user according to a predetermined positioning instruction, comprising the following steps:a first step of acquiring a first image,a step of characterizing, in said first image, a first position of the body part,a step of determining a second position of the body part,a processing step in which doctored video feedback of the body part is displayed to the user so as to generate a self-correction by the user of the positioning of said body part according to the predetermined positioning instruction,a second step of acquiring a second image, during the processing step.