| 摘要 |
PCT No. PCT/JP96/01523 Sec. 371 Date Mar. 19, 1997 Sec. 102(e) Date Mar. 19, 1997 PCT Filed Jun. 5, 1996 PCT Pub. No. WO96/39776 PCT Pub. Date Dec. 12, 1996Focus control is provided by estimating an estimation value by extracting a high-frequency component of a video signal for each focus lens position. The correct focus lens position for focusing a target object is determined as that focus lens position where the estimation value for a plurality of conditions at a particular focus lens position becomes maximum. The estimation value is determined to be maximum when, for successive focus lens positions, the estimation value decreases continuously. The various conditions for imaging, according to an aspect of the focus control, includes the filter coefficients for extracting the high-frequency component of the video signal and the size of the windows from which the video signal is imaged. The estimation value for each focus lens position is determined for these various conditions for imaging and a predetermined weight is allocated thereto, wherein the estimation value is determined to increase when the weighted sum indicating an increase outweighs that for a decrease.
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