Adaptive Camera Field of View in Adjustable Rearview Mirror
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Solution Overview
Problem
Existing vehicle vision systems face challenges in maintaining a stable and adjustable field of view for forward-facing cameras, particularly when the interior rearview mirror is adjusted, which can affect the accuracy of driver assistance systems like lane departure warning and traffic sign recognition.
Innovation Solution
Incorporating a forward viewing camera into the adjustable mirror head of the interior rearview mirror assembly, with an adaptive active sensing area that adjusts based on movement detection, ensuring the camera's field of view remains boresighted with the vehicle's direction of travel, regardless of mirror adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the interior rearview mirror is adjusted to accommodate different driver positions, then the rearward field of view is improved, but the forward viewing camera's field of view stability deteriorates
Solution Approach 1:
The system dynamically adjusts the active sensing area of the forward viewing camera based on detected mirror movements. When the mirror is adjusted, the system modifies the camera's active area parameters to compensate for the displacement, maintaining stable field of view coverage despite the physical movement of the camera with the mirror assembly.
2Device complexity
If the forward viewing camera is integrated into the adjustable mirror head, then the device complexity is reduced, but the measurement precision of the camera's field of view deteriorates
Solution Approach 1:
The system employs a feedback mechanism where mirror movement is detected (via sensors or image analysis), and this information is used to dynamically adjust the active sensing area of the forward viewing camera. This closed-loop control compensates for positioning errors caused by mirror adjustment, maintaining measurement precision despite the integrated mounting configuration.
3Stability of the object's composition
If the active sensing area is dynamically adjusted to compensate for mirror movement, then the field of view stability is improved, but the device complexity increases
Solution Approach 1:
The system segments the camera's sensing area into adjustable active and inactive regions. By selectively activating only the necessary portion of the sensor array and dynamically reconfiguring which pixels are active, the system achieves field of view stability through software-based control rather than complex mechanical adjustment mechanisms.
Data Source
AI summary
A vision system for a vehicle includes a forward viewing camera disposed at a mirror head of an interior rearview mirror assembly of the vehicle and having a forward field of view through the windshield of the vehicle. A sensor is disposed at the mirror head and determines a change in position of the mirror head relative to a mirror mount of the mirror assembly when the vehicle driver adjusts the mirror head. A control includes a processor operable to process image data captured by the forward viewing camera. Responsive to determination by the sensor of a change of position of the forward viewing camera relative to the mirror mount, the control selects an active sub-array of photosensors to provide an effective field of view of the forward viewing camera. The processor processes image data captured by the active sub-array of photosensors for a driver assistance system of the vehicle.