Inattention Determination Using Saccade Velocity Thresholds

The patent applies dynamics by introducing temporal and velocity dimensions to sight direction detection. It monitors the change speed of detected bright point positions and compares them against physiological limits of human eye movement (saccade speeds). When detection values exceed physiologically plausible speeds, the system dynamically adjusts by maintaining previous valid detection results, thereby filtering erroneous detections while preserving reliable inattention determination.

The patent implements feedback by continuously monitoring the velocity of sight direction changes and using this information to control the continuation time measurement. The system provides feedback to the inattention determination logic, indicating whether a sight direction change is physiologically plausible. This feedback mechanism prevents false resets of the continuation timer, ensuring that alarm timing reflects actual driver behavior rather than detection errors.

The patent applies parameter changes by introducing velocity thresholds based on human physiological parameters (saccade speed limits) to the detection system. Instead of relying solely on spatial parameters (bright point position), the system incorporates temporal derivatives (speed of position change) as an additional parameter. This physiological parameter constraint filters out erroneous detections that violate human eye movement capabilities, while maintaining the infrared reflection method's adaptability to various lighting conditions.