Focus-of-Expansion Re-Location After Vehicle Load Changes
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Solution Overview
Problem
Existing focus-of-expansion locating devices fail to re-locate the focus of expansion accurately when the orientation of the camera changes due to a change in the vehicle's loaded state, leading to inaccurate calculation of physical quantities.
Innovation Solution
A focus-of-expansion locating device that includes a loaded state determination unit to detect changes in the vehicle's loaded state using an in-vehicle sensor and a focus-of-expansion locating unit to re-locate the focus of expansion based on captured images, ensuring accurate positioning even when the camera orientation changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the focus of expansion is continuously used for a predetermined period of time, then the device complexity is reduced, but the measurement precision deteriorates when the camera orientation changes
Solution Approach 1:
The patent implements dynamic re-location of the focus of expansion based on vehicle acceleration detection. When acceleration exceeds a threshold, the system automatically re-locates the focus of expansion, making the system adaptive to changing conditions rather than static. This resolves the contradiction by allowing the system to maintain precision when needed while avoiding unnecessary operations that would increase complexity.
Solution Approach 2:
The patent changes the operational parameter of focus of expansion location timing based on acceleration conditions. Instead of using a fixed predetermined period, the system dynamically adjusts whether to re-locate based on detected acceleration events. This parameter change allows the system to maintain measurement precision during vehicle maneuvers while reducing unnecessary re-location operations during stable conditions.
2Measurement precision
If the focus of expansion is re-located frequently to maintain accuracy, then the measurement precision is improved, but the loss of time increases
Solution Approach 1:
The patent implements periodic re-location of the focus of expansion triggered by acceleration events rather than continuous or fixed-period operations. The system monitors acceleration and performs re-location only when acceleration exceeds the threshold, creating an event-driven periodic action pattern. This reduces time loss compared to frequent fixed-interval re-location while maintaining precision when vehicle conditions change.
Solution Approach 2:
The patent performs preliminary location of the focus of expansion at the start of vehicle operation or after acceleration events, preparing the system for accurate measurement before actual measurement begins. This preliminary action ensures the focus of expansion is correctly positioned before measurements are taken, reducing the need for frequent corrections and minimizing time loss.
3Productivity
If the focus of expansion is not re-located when the vehicle loaded state changes, then the productivity is maintained, but the reliability deteriorates due to inaccurate physical quantity calculations
Solution Approach 1:
The patent implements a feedback mechanism where acceleration detection triggers focus of expansion re-location. The acceleration sensor continuously monitors vehicle conditions, and when changes exceed thresholds, the system automatically initiates re-location. This feedback loop ensures the focus of expansion remains accurate during vehicle maneuvers without requiring manual intervention, maintaining both productivity and reliability.
Solution Approach 2:
The system performs self-service by automatically detecting acceleration events and triggering focus of expansion re-location without external intervention. The patent makes the system self-aware of its own operational conditions through acceleration monitoring and autonomously decides when re-location is necessary, ensuring reliability while maintaining continuous operation and productivity.
Data Source
AI summary
The focus-of-expansion locating device includes a loaded state determination unit and a focus-of-expansion locating unit. The loaded state determination unit determines whether the loaded state of the vehicle has changed based on the detection result from the in-vehicle sensor that detects the loaded state of the vehicle. The focus-of-expansion locating unit locates a focus of expansion on the captured image based on the captured image of the camera of the vehicle. The focus-of-expansion locating unit re-locates the focus of expansion when the loaded state has changed.