| 摘要 |
PURPOSE:To improve the yield by controlling a clamp means so as not to clamp a defective part in an image pickup device using an image pickup device. CONSTITUTION:After the duty is improved from an output of a device 100 by a sample-and-hold circuit 12, the result is inputted to a clamp pulse control circuit 13 to detect whether or not any defective signal exists in an optical black period. A clamp pulse applied to a clamp circuit 20 of the next stage is controlled in response to this detected output. DC regeneration is applied to a pedestal level into a reference black level at the clamp circuit 20 and various corrections are given at a process circuit 25 and the result is inputted to an encoder 30. |
