Selective Camera Defocus Mechanism for Unauthorized Access Prevention
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Solution Overview
Problem
Electronic devices with cameras are vulnerable to nefarious entities gaining control or access to captured images due to cameras being in focus at all times, making them susceptible to unauthorized use.
Innovation Solution
Implementing a selective defocus mechanism for cameras, which allows the lens to adjust its focal distance outside a typical range upon actuation of a defocus switch, rendering a portion of the field of view unidentifiable and reducing the risk of tampering by electrically isolating the defocus switch from the main circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the camera lens is kept in focus at all times, then the camera can capture clear images continuously, but the camera becomes vulnerable to unauthorized access and control by nefarious entities
Solution Approach 1:
The system performs preliminary defocusing of the camera lens before unauthorized access can occur. The scheduled task automatically adjusts the lens to a defocused state at predetermined intervals or times, proactively preventing potential unauthorized imaging while maintaining the ability to capture clear images when needed.
Solution Approach 2:
The camera lens transitions from a static focused state to a dynamic state that alternates between focused and defocused positions. The lens is controlled by a motorized mechanism that can adjust its position based on scheduled tasks, creating a dynamic security system that adapts its optical state over time.
2Reliability
If the camera lens is defocused to prevent unauthorized access, then security is improved, but the camera cannot capture clear images when needed
Solution Approach 1:
The system implements periodic switching between defocused and focused states through scheduled tasks. The lens alternates between these states at predetermined intervals, ensuring that security is maintained during defocused periods while image capture functionality is restored during focused periods, thus satisfying both security and operational requirements.
Solution Approach 2:
The system uses scheduled tasks as a feedback mechanism to control lens positioning. The scheduling system monitors time-based conditions and automatically triggers lens adjustment commands, creating a closed-loop control system that ensures the lens is in the appropriate state (focused or defocused) at the correct times without requiring manual intervention.
3Reliability
If the camera is made electrically isolated to reduce tampering risk, then security against tampering is improved, but the complexity of the electrical architecture increases
Solution Approach 1:
The electrical architecture is segmented into isolated domains. The camera lens control system is electrically separated from the main device circuitry through dedicated isolation barriers, creating distinct electrical zones. This segmentation prevents unauthorized electrical access from propagating across the entire system while maintaining controlled access to specific components.
Solution Approach 2:
Electrical isolators act as intermediary components between the camera lens control circuitry and the main device electronics. These intermediary elements provide controlled electrical coupling while maintaining galvanic isolation, allowing signal transmission while blocking unauthorized power access and tampering attempts, thus enhancing security without requiring complete electrical disconnection.
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 solution effectively mitigates the risk of unauthorized camera use by making captured images unidentifiable and reducing the likelihood of tampering, enhancing privacy and security for electronic device users.
Implementation Method 1
an actuator to adjust the focal distance of the lens to selectively defocus a portion of the field of view of the lens in response to actuation of the defocus switch
Data Source
AI summary
Example implementations relate the selective defocus of cameras. For instance, in an example an electronic device including a camera including a lens having a field of view and a focal distance, a defocus switch, and an actuator to adjust the focal distance of the lens to selectively defocus a portion of the field of view of the lens in response to actuation of the defocus switch.