Crosswalk Detection Using Sensor-Estimated Candidate Positions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing crosswalk detection systems face challenges in accurately detecting crosswalks, especially when vehicles approach intersections, due to narrow intervals of stripes, which require high-resolution cameras and increased signal processing load, leading to longer detection times and larger circuit scales.
Innovation Solution
A detection device equipped with a distance-bearing sensor, position estimator, corrector, and crosswalk detector that uses electromagnetic waves to estimate candidate positions and lengths of crosswalks, corrects basis functions for image data analysis, and performs spatial frequency analysis to detect crosswalks efficiently, reducing signal processing load and enabling rapid detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high resolution camera is used to detect crosswalks with narrow stripe intervals, then measurement precision is improved, but device complexity and signal processing load increase
Solution Approach 1:
The system performs preliminary estimation of crosswalk candidate positions using distance-bearing sensor data before conducting detailed image analysis. The position estimator calculates potential crosswalk locations based on road geometry and intersection data, allowing the high-resolution camera to focus only on these pre-identified regions rather than processing entire images at full resolution
Solution Approach 2:
The detection process is divided into multiple stages: first using low-resolution imaging to identify potential crosswalk regions, then applying high-resolution analysis only to those specific segments. This segmentation allows the system to achieve high measurement precision where needed while reducing overall device complexity and processing requirements
2Measurement precision
If high resolution camera is used to detect crosswalks with narrow stripe intervals, then measurement precision is improved, but processing speed decreases
Solution Approach 1:
The position estimator performs preliminary identification of crosswalk candidate positions using distance-bearing sensor data and road geometry information before detailed image analysis. This preliminary action reduces the amount of image data that requires high-resolution processing, thereby improving detection speed while maintaining measurement precision
Solution Approach 2:
The system applies high-resolution image analysis only to partial regions identified as crosswalk candidates, rather than processing the entire image at full resolution. This partial action approach maintains detection accuracy for crosswalks with narrow stripe intervals while significantly reducing processing time and computational load
3Measurement precision
If various sensors are used to recognize crosswalks, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The distance-bearing sensor serves multiple functions: it detects objects around the vehicle, measures distances to potential crosswalks, and provides bearing information for position estimation. This multi-functionality allows the system to achieve high measurement precision for crosswalk detection without adding dedicated sensors, thereby reducing overall device complexity
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
The solution allows for accurate and rapid detection of crosswalks, reducing signal processing load and detection time, while maintaining high accuracy even in complex intersection scenarios, thus enhancing safety and operational efficiency.
Implementation Method 1
a distance-bearing sensor that transmits an electromagnetic wave and receives the electromagnetic wave that is reflected from an object
Data Source
AI summary
There is provided a detection device that includes: a position estimator that estimates a candidate position of a crosswalk in a movement direction of a vehicle and estimates a length of the crosswalk and an intersecting angle between the crosswalk and a roadway using the candidate position; a corrector that corrects the numbers of periods and widths of two basis functions based on the estimated length of the crosswalk and the estimated intersecting angle, the two basis functions corresponding to intervals of white lines of the crosswalk and are orthogonal to each other; and a crosswalk detector that detects whether or not the crosswalk is present using both image data which include the candidate position and the two corrected basis functions.