本文提出一新型汽車擋風玻璃警示系統，此系統能將前方具有潛在危險的障礙物的警示資訊直接顯示在車輛擋風玻璃上，駕駛者不需將視線從前方車道移走即可藉注視該警示點看到前方障礙物；相較於傳統裝置，需轉移駕駛者視線至LCD顯示器才能獲得資訊之作法，本文所提出之系統有較佳之安全性與效率。藉由攝影機與影像辨識軟體偵測到之車道前方障礙物之位置資訊，透過系統數學模型求得駕駛者與障礙物之視線方程式，並利用代數法求得視線方程式與擋風玻璃之交點解析式；再同步驅動雷射投射裝置將警告資訊投射於此位置，讓駕駛者得以直接藉由該雷射投影點看到前方車道障礙物，以達到有效警示目的。本文藉由電腦模擬程式驗證系統的數學方程式之正確性；並建立虛擬實境實驗平台與實車驗證平台證實擋風玻璃警示系統之可行性；最後並實際進行實車測試，實驗證實擋風玻璃警示系統之確實效用，有助於降低車禍發生率且增進行車安全。

The present study proposes a novel mark-on-windshield warning system for vehicles, by which the driver can see the potential hazardous object in front by looking at the direction through the mark on the windshield, without the need of moving his sight to the equipped liquid crystal display (LCD) panel for identifying the position of the obstacle as in traditional arts. The target to be warmed after identified by the camera and software system will be used to construct the line-of-sight equation based on the coordinate system on the moving vehicle. The explicit equation of the intersection point of the line-of-sight and the windshield surface is derived using the algebraic method. A warning mark is then projected at the intersection point on the windshield by a two-dimensional robotic laser projector, allowing the driver to easily identify the obstacle. A computer simulation program of the system is developed to validate the mathematical model of the system. A virtual-reality experimental platform and an actual vehicle experimental platform are constructed to demonstrate the feasibility of the proposed system. Finally, the experiments with the warning system installed on a car driving on the road proved the effectiveness in real time.

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