| 摘要 |
PURPOSE:To reduce a fixed noise and to improve a picture quality by rounding through a filter an image pickup signal which is smear-collected. CONSTITUTION:An image pickup signal which is read out by use of a CCD1 as an image pickup element, and a signal reading-out horizontal shift register 2 is converted to a digital signal by an A/D converter 3, and thereafter, is supplied to a smear-correcting means 5. This smear-correcting means 5 consists of, for instance, a memory 6, a synthesizer 7 and a synchronizing adder 8. The smear- corrected image pickup signal is supplied to a digital filter 20. This filter 20 consists of, for instance, a delay element 21, an adder 22 and a level regulator 23. An output of the filter 20 is supplied to a rounding means 25, and is rounded to effective bit length. In this way, a fixed noise is converted to a random noise, and a picture quality can be improved. |
