Ambient Brightness Smoothing With Gradient-Limited Vehicle Sensing
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Solution Overview
Problem
Existing methods for determining ambient brightness in vehicles fail to adequately distinguish between slow changes, such as day-night transitions, and rapid fluctuations due to driving situations, leading to suboptimal control of vehicle functions.
Innovation Solution
A method incorporating gradient limiting in addition to averaging, which adjusts current brightness values to follow slow changes well while filtering out rapid fluctuations, using asymmetric gradient limitation to differentiate between increasing and decreasing brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If brightness values from different brightness detection devices are used for different display regions, then the display brightness can be adapted to ambient light conditions, but measurement errors occur when the detection device is positioned far from the display region
Solution Approach 1:
A conversion formula acts as an intermediary to translate brightness values measured at one location (first display region) to represent brightness conditions at another location (second display region). This mathematical mediator compensates for the physical distance between the detection device and the display regions, enabling accurate brightness control across multiple regions without requiring multiple sensors.
Solution Approach 2:
A single brightness detection device serves multiple functions by providing brightness data for multiple different display regions through conversion formulas. Instead of requiring separate detection devices for each region, one device universally represents the ambient light conditions for all display regions, reducing system complexity while maintaining adaptability.
2Measurement precision
If multiple brightness detection devices are deployed for different display regions, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent merges the functionality of multiple brightness detection devices into a single device by combining it with conversion formulas that mathematically distribute the brightness information to multiple display regions. This consolidation reduces the number of physical devices while maintaining the capability to control brightness across multiple regions accurately.
Solution Approach 2:
Instead of physically deploying multiple detection devices, the patent creates virtual copies of the brightness measurement through conversion formulas. These mathematical copies allow the system to treat the single measured brightness value as if it were measured at multiple locations, reducing hardware requirements while maintaining measurement precision.
3Device complexity
If a conversion formula is used to calculate current brightness value, then device complexity is reduced, but calculation accuracy may be affected by formula parameters
Solution Approach 1:
The conversion formula uses adjustable parameters (first and second parameters) that can be optimized to match specific display and environmental conditions. By tuning these parameters, the system achieves accurate brightness calculation results that account for the relationship between the detection device position and different display regions, maintaining precision while using a simplified single-device approach.
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
Effectively represents day-night cycles while reducing the influence of temporary driving situations, enhancing the accuracy of vehicle functions like fatigue detection by minimizing false triggers.
Implementation Method 1
a current brightness value is provided which is based on a brightness curve and on a detected ambient brightness value
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method for providing a current brightness value (H) relating to an ambient brightness. At least one first brightness raw value (HR) and, chronologically thereafter, at least one second brightness raw value (HR) are detected by means of at least one brightness sensor (14), an averaging process at least using the at least one first brightness raw value (HR) is carried out at least for the at least one second brightness raw value (HR), and the result of the averaging process is provided as a current average brightness value (HM). According to the invention, a gradient limiting process is carried out for the current average brightness value (HM), the deviation of the current average brightness value (HM) from at least one previously provided brightness value (H) being limited to at least one maximally permissible value according to the gradient limiting process if the deviation of the current average brightness value (HM) from the at least one previously provided brightness value (H) is greater than the at least one maximally permissible value, and the result of the gradient limiting process is provided as the current brightness value (H).