Perspective-Corrected Overlay for Motor Vehicle Imaging
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Solution Overview
Problem
Advanced Driver Assistance Systems (ADAS) struggle to provide accurate and intuitive overlays of a vehicle's path of travel in 2D images, leading to potential driver confusion and safety risks due to incorrect positioning and distraction, especially when dealing with complex environments like sloping ground or obstacles.
Innovation Solution
A computer-implemented method that generates perspective-corrected and trimmed overlays by incorporating 3D data to adapt the predicted path of travel, fragmenting it, and adjusting shading and shape based on 3D data, ensuring the overlay accurately represents the environment's topography and terminates at impassable obstacles, thereby improving visibility and decision-making for the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a predicted path of travel is displayed as overlay on a 2D image, then the driver receives guidance information, but the overlay may be positioned incorrectly and cause driver confusion
Solution Approach 1:
The patent applies perspective correction by transforming 3D spatial information into a corrected 2D representation that accounts for camera angle and vehicle geometry. This dimensional transformation allows the overlay to be positioned accurately on the 2D display by calculating virtual camera positions and applying perspective transforms, resolving the positioning accuracy issue while maintaining driver trust.
Solution Approach 2:
The system dynamically adjusts overlay parameters including position, scale, and orientation based on vehicle state data (steering angle, speed, camera position). By continuously modifying these parameters in response to changing driving conditions, the overlay maintains accurate positioning and relevance, preventing driver confusion while providing reliable guidance.
2Ease of operation
If overlays are displayed to provide path of travel information, then driver guidance is improved, but driver distraction may increase in certain situations
Solution Approach 1:
The patent applies different visual characteristics to different portions of the overlay based on their semantic meaning and urgency. Critical path information uses distinct colors or styles compared to secondary guidance elements, allowing the driver to quickly identify important information without being overwhelmed by uniform visual stimulation, thus reducing distraction while maintaining guidance quality.
Solution Approach 2:
The system selectively displays only the most relevant path information based on current driving context, rather than showing all possible overlay elements. By filtering and prioritizing information based on vehicle state and environmental factors, the system provides sufficient guidance without excessive visual information that could cause distraction.
3Ease of manufacture
If the overlay does not account for 3D topography, then implementation is simpler, but the overlay position becomes inaccurate on sloping ground
Solution Approach 1:
The patent incorporates 3D topography data and vehicle orientation information to create a perspective-corrected transformation that maps the predicted path onto the 2D image plane accurately. By using virtual camera positioning and perspective transforms that account for ground slope and vehicle angle, the system achieves precise overlay positioning on sloping terrain without requiring complex hardware modifications.
Solution Approach 2:
The system introduces intermediate calculation steps including virtual camera position determination, perspective transform matrix computation, and coordinate system transformations. These intermediary mathematical operations serve as a bridge between simple 2D display and complex 3D terrain, enabling accurate overlay positioning while maintaining relatively simple implementation through software-based geometric transformations.
Data Source
AI summary
The present invention relates to a computer-implemented method for generating a perspective-corrected overlay for an imaging system of a motor vehicle, to a method for generating a trimmed overlay for an imaging system of a motor vehicle, to devices for carrying out respective methods and to motor vehicles comprising an imaging system and such a device.