Stereo Camera Monitoring for Reliable Machine Area Detection
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Solution Overview
Problem
Existing monitoring systems for areas near machine tools are not reliable enough, often generating unnecessary alarms and failing to detect operators, which can lead to safety risks.
Innovation Solution
A monitoring system utilizing two pairs of video cameras positioned to acquire 3D images from different angles, with processing means to analyze these images for object detection and machine control, including a second pair to prevent false alarms by taking images from different optical paths and classifying objects based on dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a monitoring system uses image acquisition devices to detect operators in the operating area, then operator safety is improved, but false alarms increase and detection reliability decreases
Solution Approach 1:
The patent transitions from 2D image analysis to 3D spatial analysis by introducing depth information through stereo vision. The system calculates real-world distances from image coordinates using triangulation geometry, enabling accurate determination of operator position in three-dimensional space relative to the machine tool, thereby reducing false alarms while maintaining detection reliability
Solution Approach 2:
The patent introduces an intermediary coordinate transformation process that converts image coordinates to real-world spatial coordinates. This intermediary step acts as a mediator between the raw image data and the safety decision-making process, allowing for more accurate and reliable detection by accounting for the actual physical distances and positions
2Reliability
If the monitoring system stops the machine tool when an operator is detected in the operating area, then operator safety is improved, but machine productivity decreases
Solution Approach 1:
The patent applies different monitoring strictness to different spatial zones. The operating area is divided into regions with varying safety requirements, allowing the machine to continue operating when operators are in safer zones while only stopping when operators enter high-risk areas. This localized approach maintains safety while minimizing productivity loss
Solution Approach 2:
The system dynamically changes the monitoring parameters based on the operator's position and the machine's operating state. By adjusting the safety thresholds and response criteria according to real-time conditions, the system achieves high safety reliability without unnecessary machine stoppages that would reduce productivity
Data Source
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AI summary
Described is a system for monitoring an area (A) close to a processing machine (M), with the machine (M) having at least one operating head (2), comprising, in combination: - a first pair (C1) of video cameras (T1, T2) positioned, in use, in a predetermined reciprocal position for acquiring images of the area (A); - processing means (3), connected to the video cameras (T1, T2) for receiving the images and configured for: - a) analysing, in combination, the images of the video cameras (T1, T2) for identifying the presence of an object in the area (A); - b) acquiring a position of the operating head (2) in the area (A); - c) providing a signal (SA) for stopping the machine (M) as a function of the relative position of the operating head (2) with respect to the object identified.