| 摘要 |
PURPOSE:To attain a precise automatic focusing by a simple constitution to any object including a horizontal line or an oblique line by using an optimal focusing evaluation value obtained by electrically rotating the video signal of an objective image having an inclination at an optimal angle. CONSTITUTION:A luminance signal Y from an image pickup process 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 the first evaluation value. Next, the video signal which is rotated only at 45' 90 deg., and 135 deg. 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 second evaluation value indicating a focusing level. The MC 12 drives an AF motor driver 17 based on the first and second evaluation values, and allows it to operate a focusing operation. |
