Scene-based method for determining focus
First Claim
1. A method of determining focus for an image capture system using scene content within an image, comprising the steps of:
- a) acquiring, from the image, image data having different focus positions;
b) dividing the image data into sub-images;
c) calculating a sharpness value for each sub-image;
d) calculating an image sharpness value for each focus position using the sub-image sharpness values;
e) plotting the image sharpness value versus the focus position;
f) fitting a curve to the plot of the image sharpness values versus the focus position, wherein the curve has a peak sharpness value; and
g) determining the focus of the image capture system from a point on the curve.
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Accused Products
Abstract
A method and application specific integrated circuit for determining focus for an image capture system using scene content within an image, including the steps of: acquiring, from the image, image data having different focus positions; dividing the image data into sub-images; calculating a sub-image sharpness value for each sub-image; calculating an image sharpness value for each focus position using the sub-image sharpness values; plotting the sharpness values versus the focus position; fitting a curve to the plot of the image sharpness values versus the focus position, wherein the curve has a peak sharpness value; and determining the focus of the image capture system from a point on the curve.
48 Citations
31 Claims
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1. A method of determining focus for an image capture system using scene content within an image, comprising the steps of:
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a) acquiring, from the image, image data having different focus positions; b) dividing the image data into sub-images; c) calculating a sharpness value for each sub-image; d) calculating an image sharpness value for each focus position using the sub-image sharpness values; e) plotting the image sharpness value versus the focus position; f) fitting a curve to the plot of the image sharpness values versus the focus position, wherein the curve has a peak sharpness value; and g) determining the focus of the image capture system from a point on the curve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 25)
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12. A method of determining focus for an image capture system using scene content from a plurality of images, comprising the steps of:
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a) acquiring image data from the plurality of images, wherein the plurality of images have different focus positions; b) dividing the image data into sub-images; c) calculating a sub-image sharpness value for each sub-image; d) calculating an image sharpness value for each focus position using the sub-image sharpness values; e) plotting the sharpness value versus the focus position; f) fitting a curve to the plot of the image sharpness values versus the focus position, wherein the curve has a peak sharpness value; and g) determining the focus of the image capture system from a point on the curve. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 26, 27, 28, 29)
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23. An application specific integrated circuit for performing the steps of:
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a) acquiring, from an image, image data having different focus positions; b) dividing the image data into sub-images; c) calculating a sub-image sharpness value for each sub-image; d) calculating an image sharpness value for each focus position using the sub-image sharpness values; e) plotting the image sharpness value versus the focus position; f) fitting a curve to the plot of the image sharpness values versus the focus position, wherein the curve has a peak sharpness value; and g) determining the focus of the image capture system from a point on the curve.
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24. An application specific integrated circuit for performing the steps of:
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a) acquiring image data from a plurality of images, wherein the plurality of images have different focus positions; b) dividing the image data into sub-images; c) calculating a sub-image sharpness value for each sub-image; d) calculating an image sharpness value for each focus position using the sub-image sharpness values; e) plotting the image sharpness value versus the focus position; f) fitting a curve to the plot of the image sharpness values versus the focus position, wherein the curve has a peak sharpness value; and g) determining the focus of the image capture system from a point on the curve. - View Dependent Claims (30, 31)
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Specification