Vehicle Driving Assist System Visual Perception Difficulty Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle driving assist systems fail to effectively account for the decrease in a driver's perception ability due to complex visual environments, leading to decreased detection accuracy and over-assistance issues.
Innovation Solution
A vehicle driving assist system that uses a stereo camera and image processing to detect 3-D obstacles and determine visual perception difficulty based on environmental conditions, adjusting alarm and brake activation distances accordingly to prevent collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensitivity in detecting an obstacle by laser radar is increased to compensate for decreased driver perception ability, then the detection coverage is improved, but the accuracy of detection decreases and over-assistance occurs
Solution Approach 1:
The system applies different sensitivity levels to different spatial regions. The detection sensitivity is increased specifically in regions where visual perception difficulty is detected (such as areas with complex backgrounds, similar-shaped objects, or outline inhibitors), while maintaining normal sensitivity in other regions. This localized adjustment resolves the contradiction by improving detection reliability only where needed without compromising overall detection accuracy.
2Reliability
If the detection area is expanded to prevent delay in recognizing 3-D obstacles, then the perception ability is improved, but the system provides over-assistance and decreases usability
Solution Approach 1:
The system performs preliminary detection of visual perception difficulty conditions (such as complex backgrounds, similar-shaped objects, or outline inhibitors) before the driver actually experiences perception problems. Based on this preliminary detection, the system proactively adjusts detection sensitivity and area only in the affected regions, preventing perception delays without causing over-assistance in unrelated areas, thus maintaining usability.
3Reliability
If the output power of the sensor is increased to detect 3-D obstacles in complex visual environments, then the detection ability is improved, but the accuracy of detection decreases
Solution Approach 1:
The system increases sensor output power locally only in directions and regions where visual perception difficulty is detected, rather than uniformly increasing power in all directions. This selective power adjustment improves detection ability in challenging regions while avoiding the accuracy degradation that would result from blanket power increases across the entire detection field.
Data Source
AI summary
In a vehicle driving assist system, an external environment recognition unit detects a 3-D obstacle inhibiting the driving direction of the vehicle based on an image captured by a stereo camera and determines whether the image ahead of the vehicle is in a condition that makes visual perception of the 3-D obstacle difficult. A controller calculates a required alarm working distance between the vehicle and the 3D obstacle, at which an alarm unit is worked when the vehicle approaches the 3D obstacle, and a required brake operating distance, at which a brake is operated by a brake applying unit, based on a vehicle traveling speed. If it is determined that an external environment is in a condition that makes visual perception difficult, the required working and operating distances are extended by predetermined values to set the working and operating timings earlier.