Vehicle State Determining Device Using Movement Change Amount Analysis
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Solution Overview
Problem
Existing vehicle state determining devices face accuracy issues in detecting movement states, particularly when environmental conditions change, such as with flashing hazard lamps or presence of other moving objects, leading to potential erroneous determinations.
Innovation Solution
A vehicle state determining device comprising an extracting unit for feature points from images, an estimating unit for movement amounts, and a determining unit that considers both movement and change in movement amounts to accurately assess the vehicle's state, using thresholds to differentiate between valid and erroneous movement signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If optical flow is selected on the basis of acquired images to detect vehicle movement state, then the detection process is simple, but the accuracy of detection decreases when environmental conditions change (e.g., flashing hazard lamps)
Solution Approach 1:
The patent segments the detection process into multiple independent analysis dimensions: (1) optical flow-based movement amount detection, (2) hazard lamp detection through color segmentation, and (3) change amount analysis of movement amounts. By dividing the detection into these separate segments, the system can identify when hazard lamps are flashing and exclude these periods from movement state determination, thereby maintaining high accuracy without excessive complexity.
Solution Approach 2:
The patent introduces an intermediary analysis layer that processes the raw optical flow data through multiple stages: first calculating movement amounts, then analyzing changes in these movement amounts, and finally determining vehicle state based on both metrics. This intermediary layer acts as a filter that distinguishes between legitimate movement signals and false signals caused by flashing hazard lamps, improving detection accuracy while keeping the overall system manageable.
2Device complexity
If only movement amount is used to determine vehicle state, then the determination process is simple, but false determination occurs under changing environmental conditions
Solution Approach 1:
The patent employs dynamic analysis by examining not just the movement amount itself but also the change amount of movement amounts over time. This dynamic approach allows the system to adapt to changing environmental conditions: when hazard lamps flash, the movement amount may change, but the change amount pattern differs from actual vehicle movement patterns. By using this dynamic two-parameter analysis, the system achieves reliable determination without excessive complexity.
Solution Approach 2:
The patent implements a feedback mechanism where the determined vehicle state is continuously monitored and compared against the movement amount and change amount data. When discrepancies are detected (such as large movement amounts during hazard lamp flashing), the system uses this feedback to adjust its determination, excluding unreliable periods from the final state assessment. This feedback loop enhances reliability while maintaining a relatively simple determination framework.
Data Source
AI summary
There is provided a vehicle state determining device. An extracting unit is configured to extract feature points from images acquired by an imaging device mounted on a vehicle. An estimating unit is configured to estimate the movement amount of the vehicle at each time set at intervals of a predetermined time, on the basis of the feature points extracted by the extracting unit. A determining unit is configured to perform determination on movement of the vehicle on the basis of the movement amount estimated by the estimating unit, and the change amount of the movement amount.