Camera-Based Door Position Detection for Smart Locks
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Solution Overview
Problem
Existing access control systems face limitations in accurately determining the security state of doors, particularly when electronic locks rely on deadbolt status, which can lead to false secure states if the door is not closed, and require additional sensors like magnetic systems that are susceptible to metal interference.
Innovation Solution
A camera-based door position detection system that captures images and applies computer vision algorithms to determine the door's security state, eliminating the need for additional sensors by analyzing the door's position and lock mechanisms, and can handle both 'smart' and 'dumb' locks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic locks use deadbolt status sensors to determine door security state, then the system can detect lock engagement, but it produces false secure states when the door is not closed (e.g., door is propped)
Solution Approach 1:
The patent combines multiple detection methods (deadbolt status sensing and door position sensing) into a unified door security state determination system. The processor evaluates both the deadbolt engagement status and the door position (closed/open) together to make a comprehensive security state assessment, preventing false secure indications that would occur with either sensor alone.
2Measurement precision
If traditional magnetic sensors are installed into the door frame to determine door position, then door position can be detected, but additional custom installation procedures and magnetic materials are required
Solution Approach 1:
The electronic lock device is designed to perform multiple functions: it serves as both the locking mechanism and the door position detection system. The processor within the electronic lock analyzes images captured by the camera to determine door position, eliminating the need for separate magnetic sensors and reducing installation complexity while maintaining detection accuracy.
3Measurement precision
If electronic locks include integrated door position sensors, then door position can be detected, but the systems are very susceptible to the movement of metal in and around the door lock
Solution Approach 1:
The patent replaces traditional magnetic or mechanical door position sensors with a computer vision-based detection system. The camera captures images of the door and surrounding area, and the processor analyzes these images to determine door position and security state, completely avoiding susceptibility to metal interference that plagues magnetic sensor systems.
4Device complexity
If a camera-based system is used to detect door position, then the number of smart home devices is reduced, but image processing computational requirements increase
Solution Approach 1:
The patent extracts and focuses image processing operations on specific key features relevant to door position detection (such as the position of the door relative to the frame, and the state of the lock mechanism). By concentrating computational resources on these critical extraction tasks rather than processing entire images, the system reduces the computational burden while maintaining accurate detection capabilities.
Data Source
AI summary
A method of determining a door state in a camera-based door position system according to one embodiment includes capturing, by a camera system, an image of a door lock secured to a door, wherein the door lock includes a thumbturn that is moveable between a first position corresponding to a locked state and a second position corresponding to an unlocked state, converting, by a processing system, the captured image to a grayscale image, generating, by the processing system, a door state image based on the grayscale image, and determining, by the processing system, a current door state of the door based on the door state image and a reference image.