Camera focus control according to extraction range size and/or zoom rate
First Claim
Patent Images
1. An image pickup apparatus comprising:
- extracting means for extracting, as a focus evaluation value, a predetermined high frequency component of an image signal corresponding to an extracting range set within an image pickup plane;
focus adjusting means for adjusting focus state by moving a focus adjusting member to maximize the focus evaluation value;
extracting range varying means for varying the extracting range; and
control means for setting a evaluation value for reversing a moving direction of said focus adjusting member and varying the evaluation value according to a change of the extracting range.
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Abstract
An image pickup apparatus is provided with a focus detecting device for detecting a state of focus from a picked-up image signal outputted from an image sensor, and an electronic zoom device for electrically magnifying the picked-up image signal. The image pickup apparatus is arranged to control an operation characteristic of the focus detecting device on the basis of the operating state of the electronic zoom device.
73 Citations
19 Claims
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1. An image pickup apparatus comprising:
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extracting means for extracting, as a focus evaluation value, a predetermined high frequency component of an image signal corresponding to an extracting range set within an image pickup plane; focus adjusting means for adjusting focus state by moving a focus adjusting member to maximize the focus evaluation value; extracting range varying means for varying the extracting range; and control means for setting a evaluation value for reversing a moving direction of said focus adjusting member and varying the evaluation value according to a change of the extracting range. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image pickup apparatus comprising:
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extracting means for extracting, as a focus evaluation value, a predetermined high frequency component of a video signal corresponding to an extracting range arbitrarily set within an image pickup plane; moving means for moving a focus adjusting member along an optical axis; focus adjusting means for adjusting focus by causing said moving means to move said focus adjusting member in such a way as to maximize the focus evaluation value; image magnifying means for electrically magnifying an image within the image pickup plane; and control means for varying the extracting range according to a magnifying rate of said image magnifying means and for controlling an operation of said focus adjusting means according to a size of the extracting range. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A focus control apparatus comprising:
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extracting means for extracting, as a focus evaluation value, a predetermined high frequency component of an image signal corresponding to an extracting range set within an image pickup plane; focus adjusting means for adjusting focus state by moving a focus adjusting member to maximize a focus evaluation value; extracting range varying means for varying the extracting range; and control means for setting a evaluation value for reversing a moving direction of said focus adjusting member and varying the evaluation value in responsive that a size of the extracting range is changed. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification