Image processing method and apparatus for recovering reading faults
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Abstract
An image processing apparatus for recovering reading faults produced in time of scanning photographic film due to imperfections present on the film such as scratches, dust or stains. The apparatus comprises a defective pixel detecting unit (11) for detecting defective pixels influenced by the imperfections, an interpolating unit (12) for performing an interpolating process for the defective pixels to create corrected pixel values for the defective pixels, a standard deviation calculating unit (13) for calculating standard deviations of pixel values forming image data, and determining granularity of an input image based on the standard deviations, and a graininess adding unit (14) for adding a value obtained by multiplying the granularity by a random number to the corrected pixel values for each defective pixel.
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Citations
20 Claims
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1-10. -10. (Canceled)
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11. an image processing method for recovering reading faults from digitized image data of an input image read from an image recording medium, the faults being due to imperfections present on the image recording medium, said method comprising the steps of:
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detecting defective pixels influenced by said imperfections;
performing an interpolating process for said defective pixels to create corrected pixel values for said defective pixels;
calculating standard deviations of pixel values forming the image data, and determining granularity of said input image based on said standard deviations; and
adding a value obtained by multiplying said granularity by a random number to said corrected pixel values for each defective pixel. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A computer-readable medium comprising computer-executable instructions for recovering reading faults from digitized image data of an input image read from an image recording medium, the faults being due to imperfections present on the image recording medium, said computer-executable instructions for:
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detecting defective pixels influenced by said imperfections;
performing an interpolating process for said defective pixels to create corrected pixel values for said defective pixels;
calculating standard deviations of pixel values forming the image data, and determining granularity of said input image based on said standard deviations; and
adding a value obtained by multiplying said granularity by a random number to said corrected pixel values for each defective pixel. - View Dependent Claims (19)
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20. An image processing apparatus for recovering reading faults produced in time of scanning photographic film due to imperfections present on the film, said apparatus comprising:
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a defective pixel detecting unit for detecting defective pixels influenced by said imperfections;
an interpolating unit for performing an interpolating process for said defective pixels to create corrected pixel values for said defective pixels;
a standard deviation calculating unit for calculating standard deviations of pixel values forming image data, and determining granularity of an input image based on said standard deviations; and
a graininess adding unit for adding a value obtained by multiplying said granularity by a random number to said corrected pixel values for each defective pixel.
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Specification