3D Object Detection Device Lens Cleaning Control
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Solution Overview
Problem
Camera lens contamination during cleaning leads to mistaken detection of three-dimensional objects due to changes in image information caused by cleaning fluid, reducing the precision of obstacle detection in vehicle systems.
Innovation Solution
A three-dimensional object detection device that assesses the lens state during cleaning and retains previous detection results for a predetermined time, suppressing detection processes during lens cleaning to prevent misidentification of objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lens cleaning is performed during image capture, then lens contamination is removed, but cleaning fluid adhering to the lens surface causes changes in image information leading to mistaken detection
Solution Approach 1:
The system performs preliminary assessment of lens state before detection, identifying when cleaning fluid is present on the lens surface. This allows the system to proactively suppress detection processes during cleaning operations rather than reacting to erroneous detection results after they occur.
Solution Approach 2:
The lens state assessment unit acts as an intermediary between the lens cleaning process and the three-dimensional object detection process. It monitors lens conditions and controls the detection unit accordingly, preventing cleaning fluid interference from affecting detection accuracy without interrupting the cleaning operation.
2Reliability
If detection process is suppressed during lens cleaning, then mistaken detection is prevented, but detection results are not updated during cleaning period
Solution Approach 1:
The system implements periodic assessment of lens state at defined intervals. When cleaning is detected, the system suppresses detection temporarily but resumes periodic detection once cleaning is complete, maintaining a balance between preventing mistaken detection and ensuring timely detection results.
Solution Approach 2:
The system retains detection results from before cleaning as a preliminary measure during the cleaning period. This ensures continuous detection coverage without requiring real-time updates during suppression, reducing the impact of detection result retention time while maintaining reliability.
3Measurement precision
If lens cleaning is performed, then image quality is improved, but changes in image information cause already detected objects to change to undetected or vice versa
Solution Approach 1:
The system uses feedback from lens state assessment to control the detection process. When cleaning fluid is detected on the lens, the system feeds back control signals to suppress detection, preventing the instability caused by changing image information during cleaning. This maintains detection result consistency while still allowing image quality improvement.
Solution Approach 2:
By assessing lens state preliminarily before detection occurs, the system can prevent detection result instability before it happens. This proactive approach ensures that detection processes are suppressed during cleaning operations, preventing already detected objects from changing to undetected or vice versa due to cleaning fluid interference.
Data Source
AI summary
A three-dimensional object detection device has a camera, a three-dimensional object detection unit, a lens cleaning device, a lens state assessment unit and a controller. The camera has a lens for forming an image of an area rearward of a vehicle. The three-dimensional object detection unit detects a three-dimensional object rearward of the vehicle based on the captured images. The lens cleaning device sprays cleaning fluid to clean the lens of the camera. The lens state assessment unit accesses whether the lens is in a predetermined state subject to control based on a timing at which cleaning fluid is sprayed on the lens. The controller suppresses detection of the three-dimensional object by retaining detection or assessment results for a predetermined length of time that were obtained immediately before the lens was assessed to be in the state subject to control, upon assessment that the lens state is subject to control.