METHOD AND APPARATUS FOR ESTIMATING POINT SPREAD FUNCTION
First Claim
1. A method of estimating a point spread function (PSF), the method comprising:
- estimating a global motion between a short-exposure image and a long-exposure image that are continuously captured using different exposure times, and compensating for the global motion;
calculating a first resultant image by applying a band pass filter to the short-exposure image;
calculating a second resultant image by applying the band pass filter to the long-exposure image;
converting the first resultant image and the second resultant image into n-level images, where n is an odd natural number greater than or equal to 3, by deducing a first n-level resultant image and a second n-level resultant image from the first resultant image and the second resultant image, respectively;
correlating the first n-level resultant image and the second n-level resultant image, and calculating a correlation map; and
deducing the PSF from the correlation map.
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Abstract
A method of estimating a point spread function (PSF) includes: estimating a global motion between a short-exposure image and a long-exposure image that are continuously captured using different exposure times, and compensating for the global motion; calculating a first resultant image by applying a band pass filter to the short-exposure image; calculating a second resultant image by applying the band pass filter to the long-exposure image; converting the first resultant image and the second resultant image into n-level images, where n is an odd natural number greater than or equal to 3, by deducing a first n-level resultant image and a second n-level resultant image from the first resultant image and the second resultant image, respectively; correlating the first n-level resultant image and the second n-level resultant image, and calculating a correlation map; and deducing the PSF from the correlation map.
17 Citations
25 Claims
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1. A method of estimating a point spread function (PSF), the method comprising:
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estimating a global motion between a short-exposure image and a long-exposure image that are continuously captured using different exposure times, and compensating for the global motion; calculating a first resultant image by applying a band pass filter to the short-exposure image; calculating a second resultant image by applying the band pass filter to the long-exposure image; converting the first resultant image and the second resultant image into n-level images, where n is an odd natural number greater than or equal to 3, by deducing a first n-level resultant image and a second n-level resultant image from the first resultant image and the second resultant image, respectively; correlating the first n-level resultant image and the second n-level resultant image, and calculating a correlation map; and deducing the PSF from the correlation map. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for estimating a point spread function (PSF), the apparatus comprising:
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a global motion compensating unit that estimates a global motion between a short-exposure image and a long-exposure image that are continuously captured with different exposure times and that compensates for the global motion; a first resultant image calculating unit that calculates a first resultant image by applying a band pass filter to the short-exposure image; a second resultant image calculating unit that calculates a second resultant image by applying the band pass filter to the long-exposure image; an n-level image deducing unit that converts the first resultant image and the second resultant image into n-level images, where n is an odd natural number greater than or equal to 3, and that deduces a first n-level resultant image and a second n-level resultant image from the first resultant image and the second resultant image, respectively; a correlation map calculating unit that correlates the first n-level resultant image and the second n-level resultant image, and that calculates a correlation map; and a PSF deducing unit that deduces the PSF from the correlation map. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transitory computer readable storage medium having stored thereon a program executable by a processor for performing a method of estimating a point spread function (PSF), wherein the method comprises:
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estimating a global motion between a short-exposure image and a long-exposure image that are continuously captured using different exposure times, and compensating for the global motion; calculating a first resultant image by applying a band pass filter to the short-exposure image; calculating a second resultant image by applying the band pass filter to the long-exposure image; converting the first resultant image and the second resultant image into n-level images, where n is an odd natural number greater than or equal to 3, by deducing a first n-level resultant image and a second n-level resultant image from the first resultant image and the second resultant image, respectively; correlating the first n-level resultant image and the second n-level resultant image, and calculating a correlation map; and deducing the PSF from the correlation map. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method of controlling a digital photographing apparatus, the method comprising:
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continuously capturing a short-exposure image and a long-exposure image having different exposure times in response to one shutter-release button input; and estimating a point spread function (PSF) from the short-exposure image and the long-exposure image, wherein the short-exposure image has a shorter exposure time than the long-exposure image, wherein a gain value of an imaging unit with respect to the short-exposure image is greater than a gain value of the imaging unit with respect to the long-exposure image, and wherein a sum of the exposure times of the short-exposure image and the long-exposure image is determined depending on an exposure time set when the shutter-release button is input. - View Dependent Claims (23)
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24. A digital photographing apparatus comprising:
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an imaging unit; an imaging unit controller that continuously captures a short-exposure image and a long-exposure image having different exposure times in response to one shutter-release button input; and an apparatus for estimating a point spread function (PSF) that uses the short-exposure image and the long-exposure image to estimate the PSF of a captured image with respect to the shutter-release button input, wherein the short-exposure image has a shorter exposure time than the long-exposure image, wherein a gain value of the imaging unit with respect to the short-exposure image is greater than a gain value of the imaging unit with respect to the long-exposure image, and wherein a sum of the exposure times of the short-exposure image and the long-exposure image is determined depending on an exposure time set when the shutter-release button is input. - View Dependent Claims (25)
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Specification