read electronics are described in related applications ser no 07 815 924 and serial no pct us92 11356 and briefly this involves addressing data from a data bus 121 connected via an interface bus 123 through an address buffer 125 to select particular rows of data after an image has been formed on sensor array 108 this is done by operating row select switches 127 to illuminate a selected data page the address available from bus 121 includes page address data fed over x and y decode buses 131 and 133 which cause x decode 135 and y decode 137 to select a particular one of the multiple light sources 106 to illuminate a single page of data for imaging onto sensor array 27 a timing control 139 provides in a manner known per se a sequence of timing control signals identified as 34 pulse led 34 controls page light sources 106 34 pulse ccd row 34 controls the read out of data from a charge coupled device sensor array 108 34 gate mux 34 controls an output multiplexer from sensor array 108 and 34 data ready 34 signals that the data is ready from the data output multiplexer and interface to a data user bus the output of data from sensor array 108 is made available through a buffer register 141 a multiplexer 143 an interface to bus 145 and an output data bus 147 fig7 shows a suitable construction of sensor array 108 including the capability of discriminating against spurious overlapping light falling on sensor elements that are not incident with 34 true 34 bit image rays.