Vehicle Camera Luminance Cross-Check for ASIL Compliance
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Solution Overview
Problem
Current advanced driver-assistance systems (ADAS) and automated driving systems (AD) rely on complex sensors, including image capturing devices, which require voltage and clock monitoring to ensure safety integrity levels, but this monitoring adds complexity and cost.
Innovation Solution
A luminance assessment system that uses multiple image capturing devices with overlapping fields of view to measure and compare luminance values, detecting deviations and identifying improper functioning, thus eliminating the need for specialized IC components for voltage and clock monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage and clock monitoring is performed using specialized IC components, then functional safety compliance (ASIL level) is achieved, but device complexity and system cost increase
Solution Approach 1:
The image capturing device performs self-diagnosis by capturing test images and analyzing luminance values to detect its own functional deviations, eliminating the need for external specialized monitoring IC components while maintaining safety compliance
Solution Approach 2:
The patent replaces specialized electrical monitoring IC components with an optical-based luminance assessment system using image capturing devices and software analysis, substituting hardware complexity with a software-driven optical measurement approach
2Reliability
If voltage and clock monitoring is performed using specialized IC components, then functional safety compliance (ASIL level) is achieved, but overall system cost increases
Solution Approach 1:
The image capturing device serves dual purposes: capturing operational images for driver assistance and performing self-diagnosis through luminance analysis, eliminating the need for separate specialized monitoring components and reducing overall system cost
Solution Approach 2:
The system performs self-monitoring using its own image capturing capability, eliminating the need for external specialized IC components and reducing bill of materials costs while maintaining functional safety compliance
3Measurement precision
If multiple image capturing devices with overlapping fields of view are used for luminance comparison, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses feedback from multiple image capturing devices comparing luminance values in overlapping fields of view to detect deviations, creating a cross-validation mechanism that improves detection accuracy while using existing sensor redundancy
Solution Approach 2:
The patent uses a subset of the existing multiple image capturing devices (those with overlapping fields of view) for luminance comparison, leveraging partial redundancy already present in the system without requiring all devices to be involved in monitoring
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables effective detection of abnormal image luminance and voltage issues in image capturing devices, ensuring compliance with safety requirements like ASIL B levels without increasing system complexity or cost.
Implementation Method 1
measuring for a first image a first luminance value of a first section, and for a second image a second luminance value of a second section
Data Source
AI summary
The present disclosure relates to a method performed by a luminance assessment system of a vehicle for monitoring of on-board vehicle image capturing device functionality compliance with a predeterminable requirement level. The luminance assessment system obtains at respective one or more time instants (t1, t2, t3), a first image and a second image. A first section of the first images and a second section of the second images respectively cover a primary region. A first luminance value of the first section and a second luminance value of the second section are measured. A luminance deviation is determined by comparing at least one of the first luminance values to at least one of the second luminance values. A determination is made that, when the luminance deviation exceeds a deviation threshold, the first image capturing device or the second image capturing device failed to function according to the requirement level.