Method and device for ascertaining an optical flow based on an image sequence recorded by a camera of a vehicle

A method for ascertaining an optical flow based on an image sequence recorded by a camera of a vehicle. In the process, at least one input signal, which represents vehicle surroundings and/or a driving situation of the vehicle identified using at least one sensor of the vehicle and/or a result of a previous ascertainment of the optical flow, and an image signal representing the image sequence are received. A time difference value is determined using the input signal. At least two individual images of the image sequence which are offset from one another by the time difference value are selected, using the image signal. Coinciding pixels in the individual images are detected to ascertain the optical flow using the coinciding further pixels.