| 摘要 |
PURPOSE:To obtain a reproduced pattern without flicker at all even under the lighting of a fluorescent lamp by using a specific operation means so as to apply operation processing to an output signal of a photoelectric converting device. CONSTITUTION:The output of a solid-state image pickup element 34 is separated into three, which are fed respectively to an integration circuit35, a smoothing circuit 3 and a 1-field time delay circuit 37. When n sets of elements of the image pickup element 3 have sensitivity (a) respectively, the j-th picture element signal Sj on the image pickup element is expressed as Sj=a.Ki.Ij, where Ki is a luminescence of the i-th field and Ij is a reflectance of an object correspond ing to the j-th picture element. An output 1 is obtained by an integration circuit 35 from the equation. A signal e2(j) delayed by a delay line 37 for one field time is used for the signal obtained from the image pickup element 33 and division of e2(j)/21 is executed sequentially, the flicker rate Ki of the light source is cancelled. Thus, the contrast of the pattern is not lost by multiplying a signal e0 smoothed by a smoothing circuit 36 having a time constant during which the flicker is smoothed with the e2(j)/e1. The result of operation shown in equa tion (e2(j)/e1)e0 is utilized as an output signal.
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