| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital still camera which reads out only a part of CCD pixels at AF (auto-focusing) time, shortens the AF building time, and reduces power consumption. SOLUTION: The digital still camera 1 can read out only a center region of regions where the CCD 4 is equally divided into (m) (m: odd number) in horizontal direction, and (n) (n: odd number) in vertical direction. At the time of auto-focusing, a reset 15 controls a horizontal synchronous reset signal which resets a horizontal synchronous signal HD and a vertical synchronous reset signal VD for a timing generator 9. A horizontal synchronous reset signal and the vertical synchronous reset signal from the reset 15 to a timing generator 9 are controlled to update the timing by multiplying (m + 1)/2mn to a value at monitoring mode time (in a case that frame update time is the same vertical decimation rate to the monitoring). By this method, the camera reads out only the center region of the CCD4 by the timing generator. COPYRIGHT: (C)2004,JPO |
