Optical Flow Analysis for Vehicle Collision Warning Suppression
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Solution Overview
Problem
Existing vehicle collision warning devices often generate frequent warnings that can disperse a driver's attention, even when the driver has a firm intention to avoid a collision, especially when these devices are installed after-market and cannot receive a brake signal from the vehicle.
Innovation Solution
A vehicle collision warning prevention method using optical flow analysis that extracts video recognition information from a forward video, calculates the average optical flow change rate, and determines if a brake operation is occurring by comparing this rate to a threshold, thereby suppressing the output of collision warning signals when a brake operation is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a vehicle collision warning device is installed as an after-market device, then the device can be added to existing vehicles, but the device cannot receive a brake signal from the vehicle
Solution Approach 1:
The patent uses video recognition information and optical flow analysis as an intermediary to detect brake operations. Instead of directly receiving the brake signal through a dedicated connection, the system mediates the detection process by analyzing changes in the forward video frames to infer brake operation status, thereby compensating for the lack of direct brake signal access.
2Reliability
If the vehicle collision warning device raises the warning issue probability to improve stability, then the accuracy of relative distance calculation is improved, but the driver's attention is dispersed
Solution Approach 1:
The patent implements feedback by continuously monitoring video recognition information and optical flow changes to detect brake operations in real-time. This feedback mechanism allows the system to adjust its warning behavior dynamically - when brake operation is detected, the system suppresses unnecessary warnings, thereby maintaining reliability while preventing driver attention dispersion.
Solution Approach 2:
Instead of generating warnings and then trying to suppress them when brake operation occurs, the patent inverts the approach by using brake detection to control warning generation in the first place. The system monitors optical flow changes to predict brake operations and proactively adjusts warning issuance, preventing attention dispersion before it occurs.
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
This method effectively prevents attention dispersion by accurately recognizing a driver's brake operation without a received brake signal, maximizing the stimulating effect of collision warnings and ensuring the driver's focus on collision avoidance.
Implementation Method 1
calculating an average optical flow change rate (OFCR) of a predetermined frame section based on a current point of time
Data Source
AI summary
A vehicle collision warning prevention method includes the steps of: (a) extracting a forward video of a vehicle and video recognition information from a video recognition module mounted in a vehicle, and detecting a size change rate of a forward object included in the video recognition information at each frame of the forward video; (b) calculating an average OFCR of a predetermined frame section; (c) determining whether a value obtained by subtracting the average OFCR from a current OFCR is less than a predetermined threshold value; (d) determining that a brake operation signal is generated when it is determined that the value is less than the threshold value; (e) determining whether a collision warning signal is generated within a predetermined time after the step (d); and (f) preventing an output of the collision warning signal when the collision warning signal is generated at the step (e).