ADAPTIVE FILTER FOR LOW-LIGHT NOISE REDUCTION
First Claim
Patent Images
1. An adaptive filter for filtering noise from a low-light image, the adaptive filter comprising:
- a morphology filter for dilating an edge detected in the image, thereby dividing the image into a non-edge region and a dilated edge region; and
a comparative filter for comparing a pixel in the non-edge region to a region surrounding the pixel and optionally replacing the pixel, based on a result of the comparison, with a new pixel derived at least in part from the region surrounding the pixel.
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Abstract
In general, in one embodiment, low-light noise is removed from an image by separately filtering luma and chroma components of the image, by adaptively filtering the image based at least in part on a Gaussian distribution of the image, and/or by dividing the image into separate regions and filtering each region separately.
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Citations
25 Claims
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1. An adaptive filter for filtering noise from a low-light image, the adaptive filter comprising:
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a morphology filter for dilating an edge detected in the image, thereby dividing the image into a non-edge region and a dilated edge region; and a comparative filter for comparing a pixel in the non-edge region to a region surrounding the pixel and optionally replacing the pixel, based on a result of the comparison, with a new pixel derived at least in part from the region surrounding the pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for adaptively filtering noise from a low-light image, the method comprising:
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dilating an edge detected in an image to divide the image into a non-edge region and a dilated edge region; comparing a pixel in the non-edge region to a region surrounding the pixel; and optionally replacing the pixel, based on a result of the comparison, with a new pixel derived at least in part from the region surrounding the pixel. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification