| 摘要 |
<p>A digital camera which includes a CCD imager. When the luminance of an object to be shot is insufficient, the frame rate of the CCD imager at focus adjusting is changed from 30 fps to 15 fps to thereby lower the reading speed of a camera signal and therefore reduce noise contained in the camera signal. Since an AF rating value is determined by integrating the high-pass frequency component of a Y signal generated based on a camera signal, an error occurs in an AF rating value if a lot of noises are contained to disable an accurate focus adjustment. Therefore, an insufficient luminance of the object to be shot obliges us to lower the drive speed of the CCD imager.</p> |
