Visitor Identification via Light Modulation Encoding
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Solution Overview
Problem
Current access control systems using intelligent electronic eyes struggle to differentiate between real-time and pre-recorded false video scenes, leading to potential security risks as unauthorized visitors can deceive the system by using pre-recorded false scenes to gain access.
Innovation Solution
The system identifies visitors by combining real-time image analysis with encoded information embedded in environmental light, using an illumination lamp and a fill lamp to ensure stable signal transmission and accurate identification, ensuring that both the image and encoded information match preset authorized data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only real-time image recording is used for visitor identification, then the system is simple to operate, but the system cannot differentiate between real-time and pre-recorded false video scenes leading to security risks
Solution Approach 1:
The patent introduces environmental light as an intermediary carrier that embeds encoded information about the scene. The illumination lamp modulates light intensity to encode specific patterns that are captured by the door device, providing an additional verification layer beyond simple image recording.
Solution Approach 2:
The system changes the parameter of light intensity over time by modulating the illumination lamp's output. This temporal variation in light parameters creates encoded information that can be extracted and verified, transforming a static image system into a dynamic verification system.
2Measurement precision
If encoded information extraction from environmental light is added to improve identification accuracy, then false positives are reduced, but the device complexity increases
Solution Approach 1:
The illumination lamp serves multiple functions: it provides necessary environmental lighting for the scene while simultaneously encoding verification information through intensity modulation. This multi-functionality reduces the need for separate components dedicated solely to encoding.
Solution Approach 2:
The environmental light in the scene serves itself by carrying both illumination and information-coding functions. The existing light infrastructure is utilized to convey verification data without requiring entirely separate signaling systems.
3Reliability
If the illumination lamp is used to embed encoded information, then the system can verify authenticity, but the system becomes more sensitive to lighting conditions
Solution Approach 1:
The system dynamically adjusts the illumination lamp's intensity to modulate encoded information. By controlling the temporal dynamics of light emission rather than relying on static lighting conditions, the system maintains verification capability across varying environmental conditions.
Solution Approach 2:
The illumination lamp performs periodic intensity modulation to encode information sequences. This periodic action creates distinct temporal patterns that can be reliably detected and differentiated from ambient environmental variations.
Data Source
AI summary
The present disclosure relates to a method for identifying a visitor. The method for identifying a visitor is applied in an access control system. The access control system includes a control terminal, a door device and an illumination lamp. The illumination lamp provides lighting for a visitor. The method for identifying a visitor includes: receiving a real-time image of a current visitor outside a door from a door device; obtaining first encoded information extracted from a first optical signal corresponding to environmental light of the visitor's current environment; and identifying the visitor as an authorized visitor when the image matches with a preset image and the first encoded information contains preset encoded information. The preset image is pre-stored image information of the authorized visitor. The preset encoded information is consistent with encoded information embedded in an optical signal of an illumination lamp for illuminating the environment.