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US 8,797,449 B2Granted
Auto-focusing apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorMasataka Hamada
Life of this patent
Estimating the term…
Abstract
An auto-focusing apparatus detects a speed of a moving object accurately even in a system in which backlash exists in focusing control by performing moving object prediction auto-focusing (AF).
Claims14
An auto-focusing apparatus comprising:
- a focus lens;
- a driving unit that drives the focus lens;
- an imaging device that receives an optical signal that has passed through the focus lens and generates an image signal;
- a focus evaluation value calculating unit that calculates focus evaluation values related to a focus state from the image signal;
- a peak position detecting unit that detects a target position of the focus lens corresponding to a peak of the focus evaluation values;
- and
- an operation unit that performs a prediction operation with respect to a moving object by using the peak position obtained by the focus lens in only a first direction,
- wherein moving object prediction auto-focusing (AF) is performed by calculating an in-focus position from a speed of the moving object and a time up to an exposure time.
5 more elements
A method, on an auto-focusing apparatus, the method comprising:
- driving a focus lens;
- receiving, by an imaging device, an optical signal that has passed through the focus lens and generates an image signal;
- calculating focus evaluation values related to a focus state from the image signal;
- detecting a target position of the focus lens corresponding to a peak of the focus evaluation values;
- and
- performing a prediction operation with respect to a moving object by using the peak position obtained by the focus lens in only a first direction,
- wherein moving object prediction auto-focusing (AF) is performed by calculating an in-focus position from a speed of the moving object and a time up to an exposure time.
4 more elements
An auto-focusing apparatus comprising:
- a focus lens;
- a driving unit that drives the focus lens;
- an imaging device that receives an optical signal that has passed through the focus lens and generates an image signal;
- a focus evaluation value calculating unit that calculates focus evaluation values related to a focus state from the image signal;
- a peak position detecting unit that detects a target position of the focus lens corresponding to a peak of the focus evaluation values;
- and
- an operation unit that performs a prediction operation with respect to a moving object by using the peak position obtained by the focus lens in only a first direction,
- wherein the operation unit calculates a speed of the moving object by using a first peak position in the first direction and a second peak position in the first direction, and a time difference between the first peak position and the second peak position.
5 more elements
Dependencies are inferred from the claim text.