IMAGE PICKUP DEVICE

摘要: PURPOSE:To improve the quality of a displayed video by providing reference zero-level correction circuit to pre-stage processing part and preventing from being clamped an erroneous reference-zero-level. CONSTITUTION:A signal AS conducted image pickup element 1 reference-zero-level 10 flows through switch 11 during horizontal scanning period, is supplied amplification 5. The comes in cut-off state blanking period AS, at position main body 12, DC level prescribed sampled 13. smoothed smoothing capacitor 15 14, substituted. Thus AS' including no level-fluctured component 7. As result, varied due noise, etc. not erroneously clamped.