摘要
當車輛在進行超車或變換車道時，駕駛者可能因為一時的疏忽或車輛的盲點(blind-spot)，而造成碰撞之危險發生，基於如此，本論文提出一個以電腦視覺為基礎的車道變換駕駛輔助與警示系統，將攝影機安裝於車輛左側方來擷取左側後方影像，並進行影像處理與分析以獲取後方車輛之資訊。當駕駛人意圖變換車道時，若有車輛正在接近中並可能造成碰撞，警示系統將提醒駕駛者注意，以避免碰撞發生。 我們利用攝影機投射原理，建立偵測與警示區域。車速較本車慢或不同行駛方向的車輛，其移動方向皆是向後方移動，而車速較本車快的車輛(正在超車)，其方向為向前方移動。以此特性，我們以區塊比對(block matching)的方法來取得移動向量(motion vector)，作為車輛偵測的依據，再藉由已取出的車輛區塊自我建立樣板(template)作為下個圖像的比對樣板，進行車輛之判定與追蹤。
並列摘要
Both the vehicle during the overtaking and changing lanes are dangerous, the collision occurred causes by the driver probably negligence and the vehicle blind spot. We propose a computer vision-based lane change driving assistance and warning system to reminding the driver when the driver changes lanes in intent. In this paper, we propose the block matching method to obtain the motion vector as a vehicle detection method. That is, when the vehicle is moving, the background and the speed slower or the vehicles have different driving direction that motion vectors are moving backward. The vehicle is overtaking that the motion vectors are moving forward toward. Therefore, we analyze the motion vector to obtain the vehicle information, and then been detected vehicles to establish a template image as compared with the next image to determine and tracking of the vehicle. Furthermore, we also use the camera projection conversion principle to setup a detection and warning area. Finally, we will use a variety of overtaking situations to verify the applicability and stability.