An illuminator an elongate inner housing having a substrate on which there is a linear array of light emitting diodes, wherein the diodes have sufficient power for illuminating objects at a distance of at least 1. An upstream plasma activation source efficiently creates reactive species remote from the photoresist on the substrate surfaces. The controller is configured to slip the downstream clutch by reducing the pressure, vary the downstream clutch pressure to a target threshold to control the slip, and increase the downstream clutch pressure to engage the clutch. A matching score is then determined for each pixel in the new view based on the warped input images.