There is provided a method for imaging a workpiece by capturing successive frames of elongated stationary view across a workpiece transit path of the robot while the workpiece is transported by the robot. In order to obtain a working member image of successive frames, the robot transit path is illuminated using a three-dimensional illumination pattern traversing the transit path. Motion-induced image distortion is prevented or reduced by adjusting the camera frame rate in real time in proportion to changes in the robot velocity profile of the workpiece along the transit path.
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