為了實現車輛周遭視線無死角的概念，各車廠在轎車的前後及兩側架設廣角攝影機，把所拍攝到的四個影像經由轉換及拼接，合成出一個俯視車輛周遭環境的影像提供給駕駛者使用，藉以達到安全停車輔助之目的。而現有的環場監控停車輔助系統所提供給駕駛者的視覺輔助，其實還有提升空間。就現有監控系統中四個影像之間的黑色接合線而言，在影像的重疊部份，可以作適當的色彩混合及亮度一致化，使所產生出來的拼接影像整體平順自然。而就拼接影像的可監控範圍而言，現有的環周監控停車輔助系統的可監控區域為介於車外的1.5到3米之間的地面，而攝影機實際拍攝到的原始影像中，除了車身旁邊的地面區域外，還有拍到高出地面的景觀，例如是更遠處的來車、行人、障礙物等。這些景物會因鳥瞰轉換後，影像中高出地面的景物會被轉換函數沿影像中心向外嚴重拉扯成失真影像，因此無法被現有的鳥瞰監控系統所利用。 本研究就以上問題，建立了一組影像徑向的非等比縮放函數，把失真的影像處理成可利用的有效影像，為駕駛提供更廣範圍的全周監控，並建構3D 模型，把現有2D的視覺輔助提升到能任意改變監控視角的3D環場視覺監控。經過一連串的影像轉換及合成處理，得到三個不同的監控模式給駕駛者使用。 除此之外，我們所提出的影像式倒車導引技術。在倒車影像中尋找一些地面特徵點，藉由追蹤這些特徵點在前後影像中的移動量，反推出車輛的行進軌跡。這項技術可代替現有倒車輔助系統中方向盤下方轉向感測器的工能，用影像中地面特徵點的運動關係代替轉向感測器偵測方向盤轉向角換算出行車軌跡的工作，以軟體取代硬體。只需要安裝四台廣角攝影機，就可以同時達到廣域全周府瞰監視及倒車軌跡估算的工能。不但節省設備成本，還可以讓駕駛在車輛出廠後能選購倒車導引系統，而不需要再把車輛開回原廠作安裝轉向感測器的作業流程，使倒車導引技術應用大眾化，能適應在不同車種上使用。 To improve the current surrounding monitor systems, we enhance the 2-D visual assistance into a wide-scoped 3-D visual assistance and provide a serviceable method to obtain the trajectory of vehicle without utilize any steering sensor on steering column. In the wide-scoped surrounding top-view monitor system, four wide-view cameras are mounted on front, rear, and the both sides of the vehicle to capture sequential images; then each four images are composed into a single surrounding top-view image. According to the quality of visual assistance, those current parking assistance systems can have better approach. In accordance with the monitor area of top-view image, the monitoring range of current top-view parking assistance systems are between 1.5 to 3 meters long outward from the vehicle, this monitoring range of those assistance systems were too limited to understand the whole surrounding traffic. Different from the current parking assistance systems, the improved approach also provides the surrounding top-view monitoring, there are also provide the effective wide-scope surrounding top-view, surrounding title-view monitoring and image-based parking guiding based on the same equipment. The guiding technique is unnecessary to mount a steering sensor on the steering column, it only utilizes the images to calculate the vehicle trajectory and provide to the driver for reference. It reduces costs and increase products efficiency.
