Vehicle Camera Floor Calibration Pattern for Robust Surround View
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Solution Overview
Problem
Existing surround view systems for vehicles require accurate calibration of camera positions and orientations to ensure correct functioning, but existing methods are not robust enough to handle variations in vehicle dimensions and environmental conditions.
Innovation Solution
A calibration arrangement and method that uses a floor space with a calibration pattern visible on the floor, allowing cameras on a vehicle to capture images of the pattern to determine their orientation and position relative to the vehicle and other cameras.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a calibration pattern is used for surround view system calibration, then measurement precision of camera position and orientation is improved, but the system becomes sensitive to environmental factors such as lighting conditions and pattern visibility
Solution Approach 1:
The calibration pattern incorporates different sub-pattern types (first sub-patterns and second sub-patterns) with distinct characteristics at different locations. The second sub-patterns have different properties from the first sub-patterns, allowing the system to use appropriate sub-patterns based on local environmental conditions, thereby maintaining measurement precision while reducing sensitivity to lighting variations and visibility issues.
Solution Approach 2:
The calibration pattern is designed to serve multiple functions simultaneously: it provides reference markers for camera calibration, includes redundancy through multiple sub-pattern types, and adapts to different environmental conditions. This multi-functionality allows the same calibration pattern to maintain effectiveness across varying lighting conditions and visibility scenarios.
2Adaptability or versatility
If calibration is performed for different vehicle types, then adaptability of the calibration system is improved, but the complexity of handling various vehicle dimensions increases
Solution Approach 1:
The calibration pattern is designed as a universal solution that can be used across different vehicle types and dimensions. By incorporating multiple sub-pattern types with different characteristics, the same calibration pattern can adapt to various vehicle configurations without requiring vehicle-specific calibration setups, thereby maintaining adaptability while reducing system complexity.
Solution Approach 2:
The calibration system handles different vehicle dimensions by utilizing the varying parameters of the sub-patterns (such as their different types and positions). The evaluation process adapts to the captured sub-patterns regardless of vehicle size, allowing the same calibration arrangement to work across different vehicle types by changing which sub-patterns are visible and how they are evaluated.
Data Source
AI summary
A calibration arrangement comprises a floor space configured to form a parking area for a vehicle, and a calibration pattern visible on the floor surrounding the floor space. A first portion of the calibration pattern is arranged on a first side of the floor space, and a second portion of the calibration pattern is arranged on a second side of the floor space, opposite the first side. Each of the first portion and the second portion of the calibration pattern comprises a plurality of identical first sub-patterns and a second sub-pattern different from the first sub-patterns. The first and second sides of the floor space have a first length. The first portion and the second portion of the calibration pattern each have a second length in a direction that is parallel to the first and second sides of the floor space, the second length being greater than the first length.