A method and system of matching a bit rate to a transmit bit rate used to transmit data on a data link are disclosed. Identification of structural pixels is based upon a scaling factor which may be adjusted by an operator, providing an image enhancement framework which may be easily adapted to various types of images and image acquisition systems. The light source delivers light into the illumination plate via the edges. This imaging system operates by scanning the sample surface with either a small positron source or a focused positron beam. The drain electrode is spaced apart from the source electrode.