| 摘要 |
PURPOSE:To reduce the capacity of a memory for compensation signal storage by storing only corresponding picture-element information on horizontal lines adjacent to crystal defect picture elements in a field of picture elements with a crystal defect and in another field. CONSTITUTION:Image pickup device 1 composed of CCD is supplied with horizontal and vertical driving pulses phiH and phiV from synchronizing circuit 2 and readout picture information is supplied to sample holding circuit 3, the output of which is supplied partially to memory 5 via A/D converter 4. In this case, if only piclure elements in an odd-numbered field have a crystal defect, a compensation signal is written in memory 5 when a signal of picture element of a fixedly numbered horizontal line in an even-numbered field. This write operation is performed as many times as the number of crystal defects and compensation signals are all written in memory 5. Then when picture-element information on the crystal defect is read out, multiplexer 7 is changed over to read the compensation signal of the crystal defect position out of memory 5 and the signal is D/A-converted 6 and further converted into an analog value, which is output. |
