| 摘要 |
PROBLEM TO BE SOLVED: To provide an image signal with less density unevenness by applying addition and averaging processing to an output from a plurality of photoelectric conversion elements whose receiving light is shut in a storage means so as to obtain a reference output thereby eliminating the effect of random noise. SOLUTION: A picture element signal stored in lots of photoelectric conversion elements 1, 11 is read by a clamp capacitor(CT) 3 by making a switch transistor(TR) 2 conductive with a transfer control pulseϕT and is stored as a picture element signal. When an averaging switch TR 5 is conductive by an averaging control pulse▵DD, the picture element signal read from a plurality of the photoelectric conversion elements (OB elements) 1 whose light is shut to the CT 3, then the signals become charges of the same level and added and averaged. As a result, a reference output is obtained from which the effect of random noise generated from the OB elements 1 is reduced. A switch TR 6 is scanned by a shift register 8 and in the case of reading the image signal in the CT 3 on the common read line sequentially, a difference from the reference output is extracted.
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