| 摘要 |
PURPOSE:To enable to compensate the dispersion of performance of each photoelectric conversion elements, by reading in standard black and white signals in advance, storing the output level, and adjusting the amplification factor and subtracting DC component based on the signals. CONSTITUTION:Before reading in an actual original, a standard black signal (e.g., distinguished state of light source) is read in as the 1st step, and a standard white signal is read in as the 2nd step, and the output signal of each photoelectric conversion element at these steps is stored in a storage circuit 8. Further, the output signal of each element of the 1st step mentioned before is subtracted at a DC component subtraction circuit 5 and the amplification factor of a variable amplifying circuit 6 is changed so as to keep the level of the output signal of each element of the 2nd step constant. Thus, the dispersion of the performance of each photoelectric conversion element of a multi-image sensor arranged in array shape is completely compensated. |
