Abstract: A driver-assistance method and a driver-assistance apparatus are provided. In the method, a movement trajectory of wheels in surroundings of a vehicle when the vehicle moves are calculated. Multiple cameras disposed on the vehicle are used to capture images of multiple perspective views surrounding the vehicle, and the images of the perspective views are transformed into images of a top view. A synthetic image surrounding the vehicle is generated according to the images of the perspective views and the top view. Finally, the synthetic image and the movement trajectories are mapped and combined to a 3D model surrounding the vehicle and a movement image including the movement trajectories having a viewing angle from an upper rear side to a lower front side of the vehicle is provided by using the 3D model when backing up the vehicle.

Abstract: A driver-assistance method and a driver-assistance apparatus are provided. In the method, a movement trajectory of wheels in surroundings of a vehicle when the vehicle moves are calculated. Multiple cameras disposed on the vehicle are used to capture images of multiple perspective views surrounding the vehicle, and the images of the perspective views are transformed into images of a top view. A synthetic image surrounding the vehicle is generated according to the images of the perspective views and the top view. Finally, the synthetic image and the movement trajectories are mapped and combined to a 3D model surrounding the vehicle and a movement image including the movement trajectories having a viewing angle from an upper rear side to a lower front side of the vehicle is provided by using the 3D model when backing up the vehicle.

Abstract: A rotating device includes a rotating disc and a combined transmission shaft. The rotating disc includes a turret and multiple driven rollers. The combined transmission shaft includes a first roller gear cam and a second roller gear cam. The first roller gear cam includes a first shaft, a combined shaft and a first helical tooth. The combined shaft protrudes outward from a side of the first shaft. The first shaft is surrounded by the first helical tooth and has a first outer surface and a first inner surface. The second roller gear cam includes a second shaft and a second helical tooth. The second shaft has a combination hole. The second shaft is surrounded by the second helical tooth and has a second outer surface and a second inner surface. The combined shaft passes through the combination hole.

Abstract: A rotating device includes a rotating disc and a combined transmission shaft. The rotating disc includes a turret and multiple driven rollers. The combined transmission shaft includes a first roller gear cam and a second roller gear cam. The first roller gear cam includes a first shaft, a combined shaft and a first helical tooth. The combined shaft protrudes outward from a side of the first shaft. The first shaft is surrounded by the first helical tooth and has a first outer surface and a first inner surface. The second roller gear cam includes a second shaft and a second helical tooth. The second shaft has a combination hole. The second shaft is surrounded by the second helical tooth and has a second outer surface and a second inner surface. The combined shaft passes through the combination hole.

Abstract: A portable eyes protector for preventing the user's eyes from becoming myopic includes a body and a brightness sensor mounted in the body and flush with an outer periphery of the body for sensing a brightness of the surrounding environment. A distance measurer is mounted to the body for measuring a distance between the user's eyes and a tabletop. whereby the brightness sensor is provided to confirm that the brightness of the surrounding environment is bright enough for reading and the distance measure is provided to remind the user to maintain a suitable pose during reading.