Acoustic-Guided Video Dome Camera for Glass Break Detection
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Solution Overview
Problem
Existing video surveillance systems lack the ability to detect noise and efficiently direct cameras to the source of noise or glass breaking, leading to missed alerts and recordings due to limited camera rotation and view capabilities.
Innovation Solution
A glass break detector with noise detection capabilities and a video dome camera system that uses microphones to pinpoint noise sources, allowing for automatic camera rotation and continuous recording of the noise source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If glass break detectors use a high noise threshold to detect glass breaking, then glass breaking detection is achieved, but noise below the threshold is not detected
Solution Approach 1:
The glass break detector dynamically adjusts its detection mode between glass break detection mode and noise detection mode. In glass break detection mode, a high threshold is used to accurately detect glass breaking events. In noise detection mode, a lower threshold is used to detect general noise events. This dynamic switching resolves the contradiction by allowing the system to optimize for either glass break detection accuracy or general noise detection versatility depending on the operational context.
2Area of stationary object
If video cameras rotate 360 degrees to cover all angles, then all possible angles can be viewed, but the camera may not be looking at the area of interest when an event occurs
Solution Approach 1:
The system uses acoustic sensors to detect noise events and determines the direction of the noise source before the camera needs to rotate. When a noise event is detected, the system calculates the bearing to the noise source and pre-positions the camera to point in that direction. This preliminary action based on acoustic detection eliminates the time delay that would occur if the camera had to rotate through all angles to find the event, ensuring the area of interest is captured immediately.
3Device complexity
If video cameras have a limited field of view, then the camera structure is simpler, but the camera cannot capture events occurring outside its current viewing angle
Solution Approach 1:
The system introduces acoustic sensors as an intermediary detection layer between the limited-field-of-view camera and the broader surveillance area. The acoustic sensors detect noise events and determine their direction from multiple angles around the camera. This intermediary provides early warning and directional information to the camera system, allowing the simple fixed-camera structure to reliably detect events that would otherwise be outside its immediate field of view by alerting the system to rotate or focus in the appropriate direction.
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
Enhances security monitoring by alerting control centers to noise and automatically recording suspicious activities, even if glass is not broken, and continuously tracking and recording individuals attempting to enter secured areas.
Implementation Method 1
noise detecting means for detecting noise and generating a noise output once a noise is detected
Implementation Method 2
a time of arrival processing circuit that determines the direction of the noise by the time of arrival of the noise at the one or more microphones
Data Source
AI summary
A glass break detector is provided with microphones for detecting glass breaking, and microphones for detecting noise, and generating a noise output once a noise is detected. The noise output triggers a video camera to record in the area of the glass break detector. Also, a security apparatus is provided, having a video dome, a video camera provided in the video dome, and one or more microphones provided on an outside surface of the video dome. If a noise is detected by the one or more microphones, the video camera points to a direction of the noise by determining the time of arrival of the noise, and the camera begins to record.