1. A video compression system comprising: a video camera mounted to or in a vehicle, and configured to generate video data; at least one sensor configured to generate vehicle motion information corresponding to a current state of motion of the vehicle; an optical flow estimation circuit configured to generate an estimated apparent motion of objects within a visual field of the video camera, where the optical flow estimation circuit chooses a starting value for determining the motion vectors by selecting an appropriate vector of a vector field for each block of the video image associated with the current state of motion of the vehicle; a video encoder circuit in communication with the optical flow estimation circuit, and configured to compress the video data in accordance with the estimated apparent motion of objects; where the optical flow estimation circuit further comprises: a motion reconstruction circuit configured to reconstruct the current state of motion of the vehicle, wherein the reconstruction is based on the vehicle motion information provided by the at least one sensor; and wherein the estimated apparent motion of objects is determined in accordance with the reconstructed state of motion of the vehicle.