Dynamic Compression Ratio Adjustment for Vehicle Electronic Mirrors
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Solution Overview
Problem
Existing vehicle electronic mirror systems face difficulties in providing an accurate representation of the vehicle's surroundings, particularly when the vehicle moves sideways, as lateral rearward view pictures are compressed, making it hard to grasp the rearward situation on the side it is moving towards.
Innovation Solution
A vehicle electronic mirror system that includes rearward view imaging, lateral rearward view imaging, compression process control, and compression ratio change control, which adjusts the compression ratio of displayed images based on the vehicle's state and its surroundings, allowing for a clearer view of the vehicle's periphery by altering the compression ratio when a physical body is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If lateral rearward view pictures are compressed in the vehicle-width direction to display a wide range, then the display coverage is improved, but the distance sense recognition deteriorates
Solution Approach 1:
The compression ratio is made dynamically adjustable based on vehicle state and peripheral situation. The system switches between a first compression ratio (for wide range display) and a second compression ratio (for better distance sense), resolving the contradiction by allowing the display to adapt its compression level according to current operational context rather than using a fixed compression ratio.
Solution Approach 2:
The system changes the compression ratio parameter based on detected vehicle states (such as lateral movement) and peripheral situations (such as detected physical bodies). By adjusting this key parameter, the system optimizes the balance between display coverage and distance sense recognition for different operating conditions.
2Loss of information
If the compression ratio is increased to show more of the vehicle rearward side, then the situational awareness is improved, but the distance sense of physical bodies deteriorates
Solution Approach 1:
The compression ratio dynamically adjusts based on the presence and position of physical bodies in the peripheral situation. When physical bodies are detected, the system applies a lower compression ratio to those specific regions to maintain distance sense accuracy, while maintaining higher compression ratios in other areas to preserve overall situational awareness coverage.
Solution Approach 2:
Different compression ratios are applied to different regions of the display based on the local situation. Areas containing detected physical bodies receive a second compression ratio optimized for distance sense, while other areas use a first compression ratio optimized for wide coverage, creating local quality variations that optimize both objectives simultaneously.
3Device complexity
If a fixed compression ratio is used for all situations, then the system complexity is reduced, but the adaptability to different vehicle states and peripheral situations deteriorates
Solution Approach 1:
The system implements dynamic compression ratio adjustment based on vehicle state detection (such as lateral movement detection) and peripheral situation detection (such as physical body detection). This dynamic approach enhances adaptability to different conditions while maintaining manageable system complexity through automated detection and control algorithms.
Solution Approach 2:
The system uses feedback from vehicle state sensors and peripheral situation detectors to automatically adjust the compression ratio. The detection results feed back to the compression control mechanism, enabling the system to adapt to different vehicle states and situations without requiring complex manual configuration or intervention.
Data Source
AI summary
A rearward camera of a vehicle electronic mirror system images a rearward view of a vehicle, and a lateral rearward camera unit images each of right and left lateral rearward views of the vehicle. A control device compresses at least one of a rearward view picture after imaging by the rearward camera and right and left lateral rearward view pictures after imaging by the lateral rearward camera unit, at least in a vehicle-width direction, and performs display on an inner mirror display. The control device changes the compression ratio of the picture in the control device, depending on at least one of a state and peripheral situation of the vehicle. Accordingly, when a vehicle rearward side including lateral rearward sides contains a site requiring an easy distance-sense grasp, it is possible to easily grasp distance sense by decreasing the compression ratio of the picture corresponding to the site.