PICTURE READER

PURPOSE: To remove interferences by permitting a signal in a reading line to be connected to the compensating pulse of a temporal change which almost compensates an interference pulse connected to a reading line by means of a switching pulse in terms of capacitance. CONSTITUTION: When an interference signal is ignored, the respective reading lines are connected to a reading amplifier, where an output voltage relies on electric charges stored for exposure in the photodiode of matrix elements, which are connected to the related reading lines and controlled by the switching pulse. The signal on the reading line desirably is sampled before/after the switching pulse repeatedly, and the arithmetic mean values of sampling values before/after the switching pulse are respectively generated. When the interference signal is generated, the difference between the sampling values corresponds to the electric charges of the photodiodes, which are connected to the reading lines via related switches 1 respectively. The difference constitutes the output signal of a reading amplifier 9 and removes a signal deviation in the lines.