Lane Width Scale Correction for Vibration-Affected Image Processing
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Solution Overview
Problem
Vibration of vehicles can cause deviations in camera orientation and height, leading to inaccurate road information acquisition, which hampers effective lane maintaining assistance systems.
Innovation Solution
An image processing device that corrects the correlation between the lane width in images and the number of pixels, using a scale correction unit to adjust for errors when the difference between calculated and acquired lane widths exceeds a predetermined value, based on vehicle width and other criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If camera is used to acquire road information, then device complexity is reduced, but measurement precision deteriorates due to vibration-induced orientation and height deviations
Solution Approach 1:
The patent changes the parameter of correlation between object length and pixel count dynamically. When lane width deviation exceeds a threshold, the system adjusts the correlation parameter to compensate for camera orientation and height deviations, thereby maintaining measurement precision without increasing device complexity
Solution Approach 2:
The patent implements a feedback mechanism where the calculated lane width is continuously compared with the acquired lane width. When the difference exceeds a predetermined value, the system triggers scale correction by adjusting the correlation parameter, creating a closed-loop control that maintains measurement accuracy
2Measurement precision
If scale correction is performed frequently, then measurement precision improves, but loss of time increases due to continuous corrections
Solution Approach 1:
The patent applies partial correction by only performing scale correction when the lane width difference exceeds a predetermined threshold. This avoids unnecessary corrections during normal operation, reducing time loss while maintaining measurement precision when needed
Solution Approach 2:
The patent introduces dynamic adjustment of the correlation parameter based on real-time lane width comparison. The correction threshold and correction magnitude are adjusted dynamically according to the detected deviation, optimizing the balance between precision and processing time
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
The image processing device 1 includes a scale correction unit 9. In a case where a difference between a width of a lane calculated by a lane-width calculation unit 6 and a width of the lane acquired from map data is greater than a predetermined value that serves as a criterion for correcting errors, the scale correction unit 9 corrects a correlation between a length of a subject in a captured image and the number of pixels constituting the captured image.