Reducing noise in digital images
First Claim
Patent Images
1. A method comprising:
- determining an unknown amplitude A of noise that contaminates at least some of the pixels of a digital image T of an arbitrary target, the amplitude being possibly different in different digital images, the determination being based on the digital image T and on a reference digital image that is representative of the contaminating noise and obtained by the same sensor,the determination being made from a decorrelation condition;
Correlation (T−
A*{the reference digital image}, {the reference digital image})=0,the determination being made over pixels in some regions of T and the reference digital image, to estimate the amplitude of the noise for each of at least some pixels of T.
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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.
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Citations
25 Claims
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1. A method comprising:
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determining an unknown amplitude A of noise that contaminates at least some of the pixels of a digital image T of an arbitrary target, the amplitude being possibly different in different digital images, the determination being based on the digital image T and on a reference digital image that is representative of the contaminating noise and obtained by the same sensor, the determination being made from a decorrelation condition;
Correlation (T−
A*{the reference digital image}, {the reference digital image})=0,the determination being made over pixels in some regions of T and the reference digital image, to estimate the amplitude of the noise for each of at least some pixels of T. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus comprising
a software processor configured to determine an unknown amplitude A of noise that contaminates at least some of the pixels of a digital image T of an arbitrary target, the amplitude being possibly different in different digital images, the determination being based on the digital image T and on a reference digital image that is representative of the contaminating noise and obtained by the same sensor, the determination being made from a decorrelation condition: - Correlation (T−
A*{the reference digital image}, {the reference digital image})=0,the determination being made over pixels in some regions of T and the reference digital image, to estimate the amplitude of the noise for each of at least some pixels of T. - View Dependent Claims (24)
- Correlation (T−
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25. An apparatus comprising
means for receiving pixels of a digital image T, and means for determining an unknown amplitude A of noise that contaminates at least some of the pixels of a digital image T of an arbitrary target, the amplitude being possibly different in different digital images, the determination being based on the digital image T and on a reference digital image that is representative of the contaminating noise and obtained by the same sensor, the determination being made from a decorrelation condition: - Correlation (T−
A*{the reference digital image}, {the reference digital image})=0,the determination being made over pixels in some regions of T and the reference digital image, to estimate the amplitude of the noise for each of at least some pixels of T.
- Correlation (T−
Specification