1. An imaging device comprising: a plurality of linear imaging arrays and image formation optics that provide field of views corresponding to the plurality of linear image arrays; at least one illumination module that produces planar light illumination that substantially overlaps the field of views corresponding to the plurality of linear imaging arrays; and image processing circuitry that analyzes pixel data values of a plurality of composite 2-D images each derived from sequential image capture operations of a corresponding one linear imaging array to derive velocity data that represents an estimated velocity of the imaging device with respect to at least one target object disposed in said field of views.