| 摘要 |
PURPOSE:To eliminate the picture distortion due to variance in the speed, by storing the video element information signal obtained at the location of lines orthogonal to the subscanning direction of two dimensional image sensor and obtaining the subscanning speed signal through the comparison with the signal after the read-in period of a given number, in a manual subscanning type read-in device. CONSTITUTION:The optical image formed on a two dimensional image sensor IS is in photoelectric conversion and it is output as a video signal of m-bit per one line and n-lines. The signal on specific lines among charges of each video element is read out with the pulse from a pulse generator PSG and stored in the 1st shift register SRa. This signal is fed to an output terminal OUT as the video signal and stored in the 2nd shift register SRb simultaneously. Further, the difference between the video information after a given number of read-in periods and the video element corresponding to a differentiating device DIC is obtained, the deviation of subscanning speed at a judging circuit JC is judged, and compensation is made by changing the read-in period. |
