Linux Camera Boot Path for Fast Vehicle Reverse Video
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Solution Overview
Problem
Automotive systems face challenges in quickly presenting camera video on a display device after booting, particularly when a vehicle is placed in reverse, due to the slow initialization of complex compositor software and inter-process communication delays.
Innovation Solution
Loading a Linux kernel and initial RAM disk image with a camera application during boot, mounting it as a root file system, and processing image frames directly without needing a compositor, to prioritize and quickly present camera imagery on the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compositor software is used to present camera video on a display device, then the system provides a complete graphical interface environment, but the initialization time is slow and video presentation is delayed
Solution Approach 1:
The patent extracts the essential function of camera video presentation from the complex compositor software environment. By using a framebuffer device directly, the system removes the intermediary compositor layer that causes delays, while still achieving the core goal of displaying camera video on the display device.
Solution Approach 2:
The patent performs preliminary actions by loading the camera application and necessary drivers into the initial RAM disk image before the kernel boots. This allows the camera application to start immediately without waiting for the full compositor environment to initialize, significantly reducing startup time.
2Adaptability or versatility
If complex compositor software is initialized during boot, then a full graphical interface environment is established, but the camera video presentation is delayed
Solution Approach 1:
The patent segments the graphical interface functionality into two parts: a minimal framebuffer-based display system for immediate camera video presentation, and the full compositor environment that can be loaded later if needed. This segmentation allows the critical camera video function to operate independently and immediately.
Solution Approach 2:
The framebuffer device serves as an intermediary between the camera application and the display device, enabling direct video presentation without requiring the compositor software. This intermediary approach maintains the essential display functionality while eliminating the speed bottleneck of complex graphical environment initialization.
3Ease of operation
If the camera application is loaded from persistent storage during boot, then the application can be presented to the user, but the loading time increases boot process duration
Solution Approach 1:
The patent performs the action of loading the camera application into memory during the initial RAM disk image preparation phase, which occurs before the kernel boot process. This preliminary loading ensures the application is immediately available in RAM when needed, eliminating the time-consuming persistent storage access during boot.
Solution Approach 2:
The initial RAM disk image is prepared in advance to include the camera application and necessary dependencies, making the system self-sufficient during boot. The kernel can directly execute the application from the initial RAM disk without needing to access persistent storage or wait for external loading mechanisms.
Data Source
AI summary
During a boot process of a computing device, a boot loader loads a kernel and an initial RAM disk image from a persistent storage device into RAM. The initial RAM disk image includes a file system that includes a camera application. The kernel is invoked, and the kernel mounts a RAM disk from the initial RAM disk image as a root file system. The kernel causes an initiation of the camera application into a user space. The camera application obtains an image frame from a camera. The camera application processes the image frame to generate a processed image frame, and provides the processed image frame to a frame buffer for presentation of the processed image frame on a display device.