HUD Calibration Using Dual Camera Capture
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Solution Overview
Problem
Existing vehicle display systems face challenges in accurately measuring the relative orientation between the viewpoint detecting camera and the Head Up Display (HUD) due to assembly errors and displacement during mounting, leading to incorrect positioning of virtual images for drivers.
Innovation Solution
A method involving the installation of a measuring camera and a calibration pattern, allowing for the capture of images by both cameras to calculate the relative position and orientation, which is then used to adjust the display position of the virtual image on the HUD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mirror is installed as a mediator to adjust the position relationship between the viewpoint detecting camera and the HUD, then the relative orientation can be measured, but the measurement process becomes complicated and time-consuming due to the need to know the accurate orientation of the mirror
Solution Approach 1:
The patent removes the mirror mediator from the measurement system and directly captures images of the calibration pattern by the viewpoint detecting camera and the measuring camera. This extraction of the intermediary element simplifies the measurement process while maintaining measurement precision, as the calibration pattern serves as a direct reference object for both cameras without requiring knowledge of mirror orientation.
2Ease of manufacture
If assembly and mounting processes are performed without strict control, then manufacturing and installation are easier, but errors in position relationship between the viewpoint detecting camera and the HUD occur
Solution Approach 1:
The patent employs a self-calibration mechanism where the system automatically measures and corrects its own position relationship errors through image capture and coordinate transformation. The calibration process uses the captured images of the calibration pattern to calculate actual position relationships, enabling the system to self-adjust without requiring precision assembly, thus maintaining ease of manufacture while achieving high positioning accuracy.
Data Source
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AI summary
In vehicle display device (100) including HUD (110) configured to display a virtual image on a front field of view of a driver and viewpoint detecting camera (120) configured to capture an image of the driver, measuring camera (210) in a position capable of capturing the virtual image is installed. In addition, calibration pattern (300) is disposed in a predetermined position with respect to a viewing angle of the virtual image, an angle of view of viewpoint detecting camera (120), and an angle of view of measuring camera (210). In addition, calibration pattern (300) is captured by viewpoint detecting camera (120) and measuring camera (210), and the virtual image is captured by measuring camera (210). The relative position and orientation between viewpoint detecting camera (120) and HUD (110) are calculated as orientation information by using an image captured by viewpoint detecting camera (120) and an image captured by measuring camera (210). In addition, the position of the virtual image displayed by HUD (110) is adjusted by using the calculated orientation information.