Methods and devices for defective pixel detection
First Claim
Patent Images
1. A method of image signal processing comprising:
- determining defective pixels on-the-fly in a digital image representation based on a comparison of a pixel under evaluation with its surrounding pixels, with reference to a known resolving capability of a lens-sensor arrangement that captured said digital image representation; and
in response to said determination correcting said defective pixels.
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Abstract
In a method of image signal processing, defective pixels are determined on-the-fly in a digital image representation based on a comparison of a pixel under evaluation with its surrounding pixels, with reference to a known resolving capability of a lens-sensor arrangement that captured the digital image representation. In response to the determination of defective pixels, the defective pixels are corrected.
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Citations
20 Claims
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1. A method of image signal processing comprising:
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determining defective pixels on-the-fly in a digital image representation based on a comparison of a pixel under evaluation with its surrounding pixels, with reference to a known resolving capability of a lens-sensor arrangement that captured said digital image representation; and
in response to said determination correcting said defective pixels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An image signal processor device comprising:
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a surrounding pixel interpolator for calculating an average value of same colored pixels surrounding a pixel under evaluation in a portion of a digital image representation;
a pixel evaluator coupled to said surrounding pixel interpolator, said pixel evaluator for determining if said pixel under evaluation is defective based on a comparison of said pixel under evaluation with its surrounding pixels, with reference to a known resolving capability of a lens-sensor arrangement that captured said digital image representation; and
a pixel replacer coupled to said pixel evaluator, wherein said pixel replacer is configured for replacing each defective pixel with a replacement pixel comprising said average value calculated by said surrounding pixel interpolator. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A digital imaging device comprising:
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an optical lens;
an image sensor coupled to said lens, said image sensor for capturing a digital image representation; and
an image signal processor coupled to said image sensor, said image signal processor comprising;
a surrounding pixel interpolator for calculating an average value of same colored pixels surrounding a pixel under evaluation in a portion of said digital image representation;
a pixel evaluator coupled to said surrounding pixel interpolator, said pixel evaluator for determining if said pixel under evaluation is defective based on a comparison of said pixel under evaluation with its surrounding pixels, with reference to a known resolving capability of a lens-sensor arrangement that captured said digital image representation; and
a pixel replacer coupled to said pixel evaluator, wherein said pixel replacer is configured for replacing each defective pixel with a replacement pixel comprising said average value calculated by said surrounding pixel interpolator. - View Dependent Claims (19, 20)
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Specification