고속 머신비전 터널 스캐닝 시스템의 주행 속도별 모션 블러 방향성 평가

초록

Motion-blur directionality under the travel-speed conditions of tunnel scanning systems operating in actual tunnels remains insufficiently quantified. This study measured horizontal and vertical optical performance using the lower camera of a highspeed machine-vision tunnel scanning system under 50 conditions combining vehicle speed (60 and 80 km/h), ISO sensitivity (100？1600), and imaging distance (2.5？6.5m). The spatial frequency at 50% modulation transfer (MTF50) and blur edge width(BEW) were evaluated. Across 25 experimental conditions available for speed-wise comparison, increasing speed reduced horizontal and vertical MTF50 by 8.98% and 1.65%, respectively, and increased BEW by 7.89% and 1.34%. The between-direction speed-change difference was -0.00767 cy/px for MTF50 and 0.330 px for BEW, indicating that degradation was concentrated in the vehicle-travel direction. ISO sensitivity had no significant main effect, whereas optical performance differed significantly across imaging-distance levels and associated zoom/focus settings. These findings support direction-aware optical-quality control in high-speed tunnel imaging but are limited to two speed levels, one camera, and a design without independent replication for each condition.

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