System and method for correcting defects in digital images through selective fill-in from surrounding areas
First Claim
Patent Images
1. A method for correcting images, comprising:
- selecting an area proximate at least one defective pixel, said area selected to include a variable number of pixels having a defectiveness metric above a predetermined threshold; and
replacing said defective pixel with a pixel having a value derived from values of one or more selected pixels within said area.
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Abstract
A system and method for correcting defects in an image. A correction area surrounding the defective pixel is dynamically chosen to include a predetermined percentage of non-defective pixels. The percentage is varied as a function of the size of the surrounding region, such that the percentage decreases as the size of the region increases. The shape of the surrounding area may be varied to further enhance the correction procedure. A center of gravity is maintained around the defective pixel by defining subregions surrounding the pixel.
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Citations
32 Claims
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1. A method for correcting images, comprising:
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selecting an area proximate at least one defective pixel, said area selected to include a variable number of pixels having a defectiveness metric above a predetermined threshold; and
replacing said defective pixel with a pixel having a value derived from values of one or more selected pixels within said area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An image processing system, comprising:
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a correction region selection unit operable to dynamically select a correction area around at least one defective pixel, said area including a variable level of non-defective pixels within a defectiveness metric above a predetermined threshold; and
replacing said defective pixel with a pixel having, a value derived from values of one or more selected pixels within said area. - View Dependent Claims (13, 14, 15)
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16. An image processing system, comprising:
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a correction region selection unit operable to dynamically select a correction area around at least one defective pixel, said area including a variable level of non-defective pixels; and
a replacement value selection unit configured to (i) select a replacement value for said defective pixel, wherein said replacement value selection unit configured to determine an average value of the selected pixels within said area, (ii) derive a reliability from selected pixels within said area, and (iii) determine a median of non-defective pixels within said area. - View Dependent Claims (17, 18, 19)
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20. An image processing system, comprising:
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a correction region selection unit operable to dynamically select a correction area around at least one defective pixel, said area including a variable level of non-defective pixels; and
a replacement value selection unit configured to select a replacement value for said defective pixel, wherein said replacement value selection unit configured to select one or more subregions chosen to include a variable percentage of non-defective pixels. - View Dependent Claims (21, 22, 23)
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24. An image processing system, comprising:
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a correction region selection unit operable to dynamically select a correction area around at least one defective pixel, said area including a variable level of non-defective pixels; and
a replacement value selection unit configured to select a replacement value for said defective pixel, wherein said image processing system comprises a reflective-type scanner.
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25. A method for correcting images, comprising:
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selecting one or more variably-sized regions proximate a defective pixel;
replacing said defective pixel with a pixel having a value derived from values of one or more of pixels within said one or more variably-sized regions; and
selecting said one or more regions to have a predetermined level of pixels having a defectiveness metric above a predetermined threshold. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification