In a method for monitoring safe driving of a vehicle, the method obtains a current image captured by an image capturing device positioned on an outside sideview mirror of the vehicle, determines a horizontal distance and a vertical distance between each pixel point in the current image and the lens of image capturing device, and selects a reference point from first specified pixel points whose horizontal distances are less than a first preset value. The method further determines second specified pixel points whose vertical distances are less than or equal to a second preset value based on the reference point, to obtains a processed image based on the second specified pixel points, and displays the processed image on an inside rearview mirror of the vehicle.