An electrographic sensor unit and method for determining the position of a user selected position thereon. The time stamp module is configured to generate a time stamp for a packet. The method is characterized in that it consists in transferring to another unit, called the remote processing unit, all or part of the processing for analyzing measurements relating to said actuator andor to said movable element. Patterning the oxide layer to expose predetermined areas of the surface of the substrate. Further, techniques for performing combined YC adjustment and color conversion are disclosed that reduce the size and power requirements of video manipulation hardware by reducing the number of logic gates and memory buffers required when YC adjustment and color conversion are implemented as separate operations.