Vehicle Speed Adaptive Frame Rate Control for Driver Assist Cameras
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Solution Overview
Problem
Current driver assist systems face challenges in efficiently managing and processing video signals from multiple cameras, leading to high power consumption and bandwidth requirements, particularly due to the need for high frame rates in traditional mirrors and surround views, which is difficult to handle with a single image processing chip.
Innovation Solution
A driver assist system that adjusts the frame rate of mirror and surround image signals based on vehicle speed, reducing the load on the signal processor and allowing for fewer and less powerful processing chips by deactivating or reducing the frame rate of cameras when vehicle speed is low, thereby optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple cameras are used to provide both traditional mirror view and surround view, then the driver receives comprehensive environmental information, but the signal processing bandwidth and power consumption increase significantly
Solution Approach 1:
The system dynamically adjusts the frame rate of camera signals based on vehicle speed. At low speeds, both mirror and surround cameras operate at full frame rate to provide comprehensive information. At high speeds, the surround camera frame rate is reduced or deactivated, while mirror camera maintains high frame rate, optimizing power consumption based on actual driving conditions
Solution Approach 2:
The patent changes the frame rate parameter of camera signals based on vehicle speed conditions. The signal processor receives vehicle speed input and adjusts the frame rate parameter of surround and mirror camera signals accordingly, transitioning between different operating modes to balance information quality and power consumption
2Speed
If high frame rate processing is maintained for both mirror and surround cameras simultaneously, then real-time performance is achieved, but the system requires multiple powerful processing chips increasing cost and complexity
Solution Approach 1:
The system applies partial processing action by selectively maintaining high frame rates only when necessary. The surround camera processing is reduced or deactivated at high vehicle speeds where surround view is less critical, while mirror camera processing maintains full capability. This partial action approach reduces the need for multiple powerful processing chips
Solution Approach 2:
The system periodically switches between different processing modes based on vehicle speed thresholds. At low speeds, both cameras process at high frame rates; at high speeds, the system transitions to reduced processing mode for surround cameras. This periodic switching optimizes computational resource utilization
3Use of energy by moving object
If the frame rate is reduced for surround view during low-speed operations, then power consumption decreases, but the quality of ambient environment visualization may be compromised
Solution Approach 1:
The system applies different quality levels to different camera signals based on local needs. During low-speed operations, the mirror camera maintains high frame rate for critical rear-view information, while the surround camera operates at reduced frame rate where ambient environment visualization is less critical. This local quality differentiation maintains essential safety information while reducing overall power consumption
Data Source
AI summary
A method of assisting a driver of a vehicle with visualization of an ambient environment comprises generating a mirror image signal corresponding to a field of view of a traditional driving mirror. A surround image signal corresponding to a field of view of an ambient environment adjacent the vehicle is generated. A vehicle speed signal is generated. The mirror image signal, the surround image signal, and the vehicle speed signal are received, and at least one of a driver mirror signal and a driver surround signal is responsively produced. A video image corresponding to at least one of the driver mirror signal and the driver surround signal is selectively displayed to the driver. A frame rate of at least one of the mirror image signal and the surround image signal is adjusted by the signal processor responsive to the vehicle speed signal. A drive assist system is also provided.