Parking Frame Selection Using Length Ratio Filtering
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Solution Overview
Problem
Existing parking assist systems face challenges in accurately detecting parking frames due to shadows, reflections, and obstacles, leading to unstable and unclear displays for drivers.
Innovation Solution
An image processor that includes a parking area line detection module, a parking frame setting module, a parking frame selection module, and a display control module, which calculates the length ratio of adjacent sides of detected parking frames and only displays those within a predetermined range, ensuring accurate and stable parking frame detection and display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If parking area line detection is performed from images captured by imaging devices, then parking frame detection is enabled, but detection accuracy deteriorates due to shadows, reflections, and obstacles causing misdetection or non-detection
Solution Approach 1:
The patent applies parameter changes by calculating the length ratio of adjacent sides of detected parking frames and comparing it against a predetermined range. This parameter-based filtering resolves the contradiction by quantitatively evaluating detection results and eliminating frames with abnormal dimensions caused by shadows, reflections, or obstacles, thereby improving detection accuracy while accounting for environmental interference factors.
2Ease of operation
If parking frame detection is performed in various detection situations, then parking assistance functionality is provided, but display stability deteriorates causing unclear and unstable parking frame display
Solution Approach 1:
The patent implements feedback by continuously monitoring the length ratio parameter of detected parking frames and using this information to control display stability. When the length ratio falls within the predetermined range, the parking frame is displayed; when it falls outside, the display is suppressed or corrected. This feedback mechanism ensures stable and clear display while maintaining parking assistance functionality across various detection situations.
3Loss of information
If all detected parking frames are displayed, then comprehensive parking information is provided, but display clarity deteriorates due to inclusion of misdetected frames
Solution Approach 1:
The patent applies the taking out principle by extracting only the valid parking frames from the set of all detected frames based on the length ratio criterion. Frames whose adjacent side length ratios fall within the predetermined range are extracted and displayed, while frames with abnormal ratios (indicating misdetection due to shadows, reflections, or obstacles) are excluded. This selective extraction maintains information completeness for valid frames while eliminating inaccurate detections.
Data Source
AI summary
An image processor includes a parking area line detection portion configured to detect a parking area line from an image acquired by an imaging device, a parking frame setting portion configured to set a parking frame based on the detected parking area line, a parking frame selection portion configured to calculate a length ratio of adjacent first and second sides of the set parking frame, determine the parking frame as a display target when the length ratio falls within a predetermined range, and not to determine the parking frame as the display target when the length ratio falls outside the predetermined range, and a display control portion configured to control a display portion for displaying a parking frame image showing the parking frame determined as the display target by the parking frame selection portion so as to keep superimposing the parking frame image onto the image.