A surround view system for a vehicle, the vehicle having a trailer attached thereto, comprising: a plurality of cameras (18, 18', 18") mounted on the vehicle and constructed and arranged to provide generally a 360° view of an area surrounding the vehicle , an electronic control unit (ECU ) mounted on the vehicle and constructed and arranged to receive image data from the cameras (18, 18', 18"), the ECU including a processor circuit and a memory circuit , the memory circuit being constructed and arranged to store a legacy observable image of the area obtained from the cameras (18, 18', 18") as the vehicle passed through a portion of the area in one direction and is further being moved through the area, and a display connected with the ECU for displaying a surround view image to a driver of the vehicle , the surround view image including an obstruction in the area occluding at least a portion of a field of view of at least one of the cameras (18, 18', 18") positioned on a rear portion of the vehicle thereby defining an unobservable region , with the trailer defining the obstruction , wherein, after the vehicle has passed through the portion of the area and is further being moved through the area in reverse to back-up the trailer , and when there is an obstruction in the area occluding at least a portion of a field of view of at least one of the cameras (18, 18', 18"), based on the legacy observable image, live images obtained from the cameras (18, 18', 18") and on a geometry of the obstruction , the processor circuit is constructed and arranged to calculate at least one unobservable region in the area based on a comparison of the legacy observable image and live images, and to cause the unobservable region to be indicated in the surround view image on the display , wherein the unobservable area includes a color filter indicative of a lack of visibility of dynamic targets entering the unobservable area. a plurality of cameras (18, 18', 18") mounted on the vehicle and constructed and arranged to provide generally a 360° view of an area surrounding the vehicle , an electronic control unit (ECU ) mounted on the vehicle and constructed and arranged to receive image data from the cameras (18, 18', 18"), the ECU including a processor circuit and a memory circuit , the memory circuit being constructed and arranged to store a legacy observable image of the area obtained from the cameras (18, 18', 18") as the vehicle passed through a portion of the area in one direction and is further being moved through the area, and a display connected with the ECU for displaying a surround view image to a driver of the vehicle , the surround view image including an obstruction in the area occluding at least a portion of a field of view of at least one of the cameras (18, 18', 18") positioned on a rear portion of the vehicle thereby defining an unobservable region , with the trailer defining the obstruction , wherein, after the vehicle has passed through the portion of the area and is further being moved through the area in reverse to back-up the trailer , and when there is an obstruction in the area occluding at least a portion of a field of view of at least one of the cameras (18, 18', 18"), based on the legacy observable image, live images obtained from the cameras (18, 18', 18") and on a geometry of the obstruction , the processor circuit is constructed and arranged to calculate at least one unobservable region in the area based on a comparison of the legacy observable image and live images, and to cause the unobservable region to be indicated in the surround view image on the display , wherein the unobservable area includes a color filter indicative of a lack of visibility of dynamic targets entering the unobservable area. <EOS>