| 摘要 |
PURPOSE:To attain a high speed and high precise automatic focusing by detecting a scanning direction in which a suitable contrast information can be obtained, and using information related with high-pass components in a video signal obtained by scanning the direction as a focusing evaluation value. CONSTITUTION:A luminance signal Y from an image pickup processing circuit 3 is written through an A/D converter 5 in a field memory 6, and supplied through a BPF 19 and an integration circuit 20 to a microcomputer(MC) 12 as automatic exposure adjustment(AE) information. Next, the video signal which is rotated at an angle at which the suitable contrast based on the AE information can be obtained is read from the memory 6 by the control of a read control circuit 15. The video signal is interpolated by an interpolation coefficient K by an interpolation processing circuit 7, and supplied through a BPF 13 and an integration circuit 14 to the MC 12 as the evaluation value indicating a focusing level. The MC 12 drives an AF motor driver 17 based on the evaluation value, and allows it to operate a focusing operation. |
