its own the invention is not limited to the carrier mediums specified herein and the invention may be implemented using any carrier medium as known in the art fig5 illustrates an exemplary imaging device 300 having a pixel array 240 row lines of the array 240 are selectively activated by a row driver 245 in response to row address decoder 255 a column driver 260 and column address decoder 270 are also included in the imaging device 300 the imaging device 300 is operated by the timing and control circuit 250 which controls the address decoders 255 270 the control circuit 250 also controls the row and column driver circuitry 245 260 a sample and hold circuit 261 associated with the column driver 260 reads a pixel reset signal vrst and a pixel image signal vsig for selected pixels of the array 240 a differential signal vrst u2212 vsig is produced by differential amplifier 262 for each pixel and is digitized by analog to digital converter 275 adc the analog to digital converter 275 supplies the digitized pixel signals to an image processor 280 which forms and may output a digital image the image processor 280 has a circuit that is capable of performing the method 200 fig4 on pixel array 240 fig6 shows system 1100 a.