1. A machine vision calibration system, comprising: a plurality of image sensors to collect image data associated with multiple fields of view (FOV) encompassing adjacent portions of a ground plane; and an image sensor calibration module coupled to the image sensors and including logic to: compute a two-dimensional ground plane projection of the collected image data based on a Radon transform of the image data for an angle corresponding to one or more extrinsic parameter values associated with one of the sensors that collected the image data; compute, from the ground plane projection, a first landmark signal associated with one or more ground plane calibration landmarks; and select between the one or more first extrinsic parameter values and one or more second extrinsic parameter values based on an evaluation of the first landmark signal.