Reducing noise in digital images
First Claim
Patent Images
1. A method comprising:
- receiving, from an image sensor, a target digital image T contaminated by noise of unknown magnitude A that is represented by a reference digital image; and
applying a process that uses a variance minimization analysis with respect to the unknown magnitude A associated with the target digital image and the reference digital image, to determine the magnitude of the noise for at least some pixels of the target digital image,wherein the determination using the variance minimization analysis is mathematically and statistically equivalent to a determination of the magnitude of the noise made from a decorrelation condition;
Correlation(T−
A*{the reference digital image},{the reference digital image})=0.
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Abstract
A target digital image is received from an image sensor. The image is contaminated by noise of unknown magnitude that is represented by a reference digital image. A process is applied that uses statistical analysis of the target digital image and of the reference digital image to estimate a magnitude of the noise for at least some pixels of the target digital image.
70 Citations
21 Claims
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1. A method comprising:
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receiving, from an image sensor, a target digital image T contaminated by noise of unknown magnitude A that is represented by a reference digital image; and applying a process that uses a variance minimization analysis with respect to the unknown magnitude A associated with the target digital image and the reference digital image, to determine the magnitude of the noise for at least some pixels of the target digital image, wherein the determination using the variance minimization analysis is mathematically and statistically equivalent to a determination of the magnitude of the noise made from a decorrelation condition;
Correlation(T−
A*{the reference digital image},{the reference digital image})=0. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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a software processor configured to receive, from an image sensor, a target digital image T contaminated by noise of unknown magnitude A that is represented by a reference digital image; and apply a process that uses a variance minimization analysis with respect to the unknown magnitude A associated with the target digital image T and the reference digital image, to determine the magnitude of the noise for at least some pixels of the target digital image, wherein the determination using the variance minimization analysis is mathematically and statistically equivalent to a determination of the magnitude of the noise made from a decorrelation condition;
Correlation(T−
A*{the reference digital image},{the reference digital image})=0. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus comprising:
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means for receiving a target digital image T contaminated by noise of unknown magnitude A that is represented by a reference digital image; and means for applying a process that uses a variance minimization analysis with respect to the unknown magnitude A associated with the target digital image and the reference digital image, to determine the magnitude of the noise for at least some pixels of the target digital image, wherein the determination using the variance minimization analysis is mathematically and statistically equivalent to a determination of the magnitude of the noise made from a decorrelation condition;
Correlation(T−
A*{the reference digital image},{the reference digital image})=0.
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Specification