Vehicle Periphery Camera Calibration via Segmented Patterns
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Solution Overview
Problem
Existing vehicle periphery image display systems face challenges in accurately adjusting camera transformation rules, especially when calibration patterns are placed outside the overlapping capture ranges of reference and adjustment-targeted cameras, leading to inaccuracies in image calibration.
Innovation Solution
A method and device for vehicle periphery image display that utilize a calibration member with multiple patterns placed in the capture areas of reference and adjustment-targeted cameras, detecting and adjusting image coordinates to align provisional calibration patterns with actual patterns, allowing for accurate calibration even when capture ranges do not overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a calibration pattern is placed in the overlapping capture range of reference camera and adjustment-targeted camera, then the transformation rule can be adjusted, but the adjustment cannot be performed when capture ranges do not overlap
Solution Approach 1:
The calibration pattern is divided into multiple segments (first calibration pattern and second calibration pattern) that can be placed in different locations. The first pattern is captured by the reference camera while the second pattern is captured by the adjustment-targeted camera, eliminating the need for overlapping capture ranges and enabling calibration in broader installation scenarios.
2Ease of manufacture
If calibration pattern is placed at arbitrary location in car dealership, then adjustment can be performed without special place, but accuracy of captured image of calibration pattern becomes low
Solution Approach 1:
By dividing the calibration pattern into multiple segments captured by different cameras, the system can use patterns at optimal positions for each camera. This allows calibration to be performed at accessible locations while maintaining high accuracy, as each camera captures its respective pattern under favorable conditions.
Solution Approach 2:
The calibration patterns serve as intermediaries that bridge the reference camera and adjustment-targeted camera. By using multiple pattern segments that can be placed at different locations, the system mediates between the need for accessible calibration locations and the requirement for high measurement accuracy.
3Device complexity
If single calibration pattern is used, then calibration process is simple, but accurate adjustment cannot be achieved when cameras are positioned far apart
Solution Approach 1:
The calibration pattern is segmented into multiple parts (first and second calibration patterns) that can be distributed across different locations within各自 capture ranges. This segmentation enables accurate calibration even when cameras are positioned far apart, as each pattern segment is captured under optimal conditions by its respective camera.
Data Source
AI summary
An onboard periphery image display device for adjusting transformation rule of each camera mounted on an automobile is provided. A predetermined calibration pattern of a calibration member is placed in a capture area of a reference camera and another calibration pattern of the calibration member is placed in a capture area of an adjustment-targeted camera. The onboard periphery image display detects a coordinate of an image of a reference calibration pattern based on the image of the predetermined calibration pattern captured by the reference camera, detects an coordinate of an image of an adjustment calibration pattern based on the image of the another calibration pattern captured by the adjustment-targeted camera, and adjusts the transformation rule determined for the adjustment-targeted camera based on the detected coordinates.