Vehicle Camera Boot Path for Fast Linux Video Presentation
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Solution Overview
Problem
Existing vehicle camera systems using Linux operating systems face delays in presenting camera imagery on a display device due to the complexity and time-consuming context switches of compositor applications, which are necessary for quick boot-up requirements, especially when reversing a vehicle.
Innovation Solution
Implementing a Linux-based system where the camera application is loaded from an initial RAM disk image and prioritized during boot-up, allowing direct image processing without inter-process communication with a compositor, ensuring rapid presentation of camera video on the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a compositor application is used for window management in the Linux-based vehicle camera system, then the system provides comprehensive windowing features and application management, but the context switches and processing complexity cause delays in presenting camera video on the display device
Solution Approach 1:
The patent extracts the essential function of displaying camera video from the complex compositor application ecosystem. By using a simplified display mechanism that bypasses the compositor's context switching and window management overhead, the system presents camera video directly to the display device, eliminating the time delay while still providing necessary windowing capabilities through a reduced-functionality approach.
2Adaptability or versatility
If the Linux operating system performs standard boot-up procedures with multiple application initializations, then the system achieves comprehensive functionality, but the boot-up time exceeds the regulatory requirement of presenting video within two seconds
Solution Approach 1:
The patent applies preliminary action by pre-configuring the system to prioritize camera application initialization during the boot-up process. The camera application is started immediately after kernel initialization, before other non-critical applications, ensuring that video presentation capability is established within the required two-second window while other system functions continue to initialize in the background.
Solution Approach 2:
The patent segments the boot-up process into critical and non-critical phases. The critical phase includes only kernel loading and camera application initialization, which must complete within two seconds. Non-critical applications and full window management services are initialized afterward, allowing the system to meet regulatory speed requirements while ultimately providing comprehensive functionality.
3Ease of operation
If inter-process communication with a compositor application is used for video presentation, then the system provides flexible window management and application control, but the communication overhead prevents rapid video display during emergency maneuvers
Solution Approach 1:
The patent extracts the core video presentation function from the inter-process communication framework of the compositor application. By implementing a direct video output path that eliminates IPC overhead, the system achieves rapid video display for emergency maneuvers while maintaining application control flexibility through alternative, more efficient communication mechanisms when full compositor functionality is not required.
Data Source
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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.