DYNAMIC AUTO-FOCUS WINDOW SELECTION THAT COMPENSATES FOR HAND JITTER
First Claim
1. A method for capturing an image, comprising:
- obtaining a first image frame having a first focus window;
obtaining a second image frame having a second focus window;
obtaining a first motion vector between the first and second image frames; and
obtaining a third image frame having a third focus window adjusted by the first motion vector to cover substantially the same target image portion as the first focus window.
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Accused Products
Abstract
A method and device are provided for mitigating and/or minimizing effects of hand jitter or shaking during an auto-focusing process of an image-capturing device. In order to more accurately focus a lens for capturing a digital image, the lens is moved between a minimum and maximum position (along an axis) while capturing sample image frames using a focus window at various lens positions. Improved auto-focusing is achieved by dynamically adjusting the relative position of the focus window for each image frame to cover substantially the same image portion of the target image. By adjusting the focus window for each image frame to cover substantially the same image portion of the target image, variations from shaking may be minimized, thereby improving auto-focusing.
27 Citations
30 Claims
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1. A method for capturing an image, comprising:
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obtaining a first image frame having a first focus window; obtaining a second image frame having a second focus window; obtaining a first motion vector between the first and second image frames; and obtaining a third image frame having a third focus window adjusted by the first motion vector to cover substantially the same target image portion as the first focus window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An image-capturing device, comprising:
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means for obtaining a first image frame having a first focus window; means for obtaining a second image frame having a second focus window; means for obtaining a first motion vector between the first and second image frames; and means for obtaining a third image frame having a third focus window adjusted by the first motion vector to cover substantially the same image portion as the first focus window. - View Dependent Claims (12, 13, 14, 15)
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16. An image-capturing device, comprising:
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an image sensor for capturing image frames; and an auto-focus module coupled to the image sensor, the auto-focus module configured to obtain a first image frame having a first focus window; obtain a second image frame having a second focus window; obtain a first motion vector between the first and second image frames; and obtain a third image frame having a third focus window adjusted by the first motion vector to cover substantially the same target image portion as the first focus window. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A computer-readable medium having one or more instructions operational on an image-capturing device to mitigate the effects of shaking during auto-focusing, which when executed by a processor causes the processor to:
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obtain a first image frame having a first focus window; obtain a second image frame having a second focus window; obtain a first motion vector between the first and second image frames; and obtain a third image frame having a third focus window adjusted by the first motion vector to cover substantially the same image portion as the first focus window. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification