RALPH decomposes the problem of steering a vehicle into three steps, 1) sampling of the image, 2) determining the road curvature, and 3) determining the lateral offset of the vehicle relative to the lane center. The output of the later two steps are combined into a steering command, which can be compared with the human driver’s current steering direction as part of a road departure warning system, or sent directly to the steering motor on our Navlab 5 testbed vehicle for autonomous steering control.
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