FOCUS ADJUSTMENT BASED ON INDICATOR OF RANDOMNESS OF PIXEL VALUES
First Claim
1. A circuit for auto-focus adjustment, comprising:
- a calculating unit configured to calculate an indicator of randomness of pixel values in a captured image;
a direction determining unit configured to compare a first value of the indicator calculated by the calculating unit in a preceding focus adjustment process with a second value of the indicator calculated by the calculating unit after the calculation of the first value, thereby to determine a direction of focus shift in response to a result of the comparison; and
a control unit configured to start a focus adjustment process by which a focus position is first moved in the direction of focus shift determined by the direction determining unit.
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0 Petitions
Accused Products
Abstract
A circuit for auto-focus adjustment includes a calculating unit configured to calculate an indicator of randomness of pixel values in a captured image, a direction determining unit configured to compare a first value of the indicator calculated by the calculating unit in a preceding focus adjustment process with a second value of the indicator calculated by the calculating unit after the calculation of the first value, thereby to determine a direction of focus shift in response to a result of the comparison, and a control unit configured to start a focus adjustment process by which a focus position is first moved in the direction of focus shift determined by the direction determining unit.
12 Citations
15 Claims
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1. A circuit for auto-focus adjustment, comprising:
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a calculating unit configured to calculate an indicator of randomness of pixel values in a captured image; a direction determining unit configured to compare a first value of the indicator calculated by the calculating unit in a preceding focus adjustment process with a second value of the indicator calculated by the calculating unit after the calculation of the first value, thereby to determine a direction of focus shift in response to a result of the comparison; and a control unit configured to start a focus adjustment process by which a focus position is first moved in the direction of focus shift determined by the direction determining unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An imaging apparatus, comprising:
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a lens; an imaging device; a calculating unit configured to calculate an indicator of randomness of pixel values in an image captured by the imaging device; a direction determining unit configured to compare a first value of the indicator calculated by the calculating unit in a preceding focus adjustment process with a second value of the indicator calculated by the calculating unit after the calculation of the first value, thereby to determine a direction of positional shift of the lens in response to a result of the comparison; and a control unit configured to start a focus adjustment process by which the lens is first moved in the direction of positional shift determined by the direction determining unit.
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12. A method for auto-focus adjustment, comprising:
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calculating an indicator of randomness of pixel values in a captured image; comparing a first value of the indicator calculated in a preceding focus adjustment process with a second value of the indicator calculated after the calculation of the first value; determining a direction of focus shift in response to a result of the comparison; and starting a focus adjustment process by which a focus position is first moved in the determined direction of focus shift. - View Dependent Claims (13, 14, 15)
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Specification