Automatic cross color elimination
First Claim
1. A method for correcting for the effects of crosscolor crosstalk between colors of a color image stored in an image storage medium and an imaging device used to scan the color image into a plurality of scanned images each corresponding to a color of the color image, comprising the steps of:
- identifying noise patterns in the plurality of scanned images;
calculating crosscolor correlations between the identified noise patterns in the plurality of scanned images; and
correcting for color crosstalk in each of the scanned images according to the crosscolor correlations.
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Accused Products
Abstract
Color crosstalk is determined between layers of an image storage medium based on the cross correlations and autocorrelations of noise in the grain pattern in each layer of the image storage medium. Rather than relying on prior measurement under laboratory conditions, the invention scans the storage medium in a plurality of spectral bands to derive the record stored in each of the dye layers. A computer derives the autocorrelations and the crosscorrelations of a group of pixels between the plurality of color records of the scanned images each of which corresponds to one of the spectral bands. The invention is based on the observation that as each dye layer is deposited separately in the film, one would expect that the "noise" from the grain boundaries in one layer to be independent from the "noise" due to the grain boundaries in other layers. If there is correlation in noise between separate color scans, it is because the scanner is measuring the grain boundaries in more than one layer in the color scans.
68 Citations
26 Claims
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1. A method for correcting for the effects of crosscolor crosstalk between colors of a color image stored in an image storage medium and an imaging device used to scan the color image into a plurality of scanned images each corresponding to a color of the color image, comprising the steps of:
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identifying noise patterns in the plurality of scanned images; calculating crosscolor correlations between the identified noise patterns in the plurality of scanned images; and correcting for color crosstalk in each of the scanned images according to the crosscolor correlations. - View Dependent Claims (2, 3, 4, 5)
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6. A method for reducing the effects of color crosstalk between a color image and a scanner used to scan the color image, comprising the steps of:
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successively scanning the color image with the scanner to produce a set of scanned images of the color image each of which corresponds to a different color; separating noise patterns from image patterns in the set of scanned images; calculating crosscolor correlations between the separated noise patterns in pairs of the set of scanned images; calculating a set of correction coefficients according to the calculated crosscolor correlations; and using the set of correction coefficients to produce a set of adjusted images corrected for color crosstalk from the set of scanned images. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method for correcting for the effects of crosstalk between images in register with each other, each registered image consisting of a desired pattern and a noise pattern, comprising the steps of;
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introducing crosstalk between the registered images to produce adjusted images; substantial separating a portion of a noise pattern from each adjusted image; calculating crosscorrelations of the separated noise patterns of the adjusted images; and adjusting the introduced crosstalk so that crosscorrelations between noise patterns of the adjusted images tend toward zero. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system for minimizing crosstalk while scanning at least three images in register with each other on a film substrate, each image consisting of a desired pattern and a grain pattern, comprising:
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means for scanning the at least three images into computer memory to produce scanned images, the scanning means introducing undesired crosstalk between the images as they exist on the film substrate into the scanned images; means for substantially isolating a portion of the grain pattern from the desired pattern in each scanned image, to produce an isolated portion of the grain pattern for each scanned image; and means for adjusting the amount of crosstalk between the scanned images to produce adjusted images such that a proportional adjustment of crosstalk between the isolated portions of the grain patterns would cause the crosscorrelations between the isolated portions of the grain patterns to tend toward zero.
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25. A system for correcting for the effects of crosstalk between images in register with each other, each registered image consisting of a respective desired pattern and a respective noise pattern, comprising:
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means for introducing crosstalk between the registered images to produce adjusted images; means for substantially separating a portion of a noise pattern from the adjusted images; means for calculating crosscorrelations between the separated noise patterns of the adjusted images; and means for adjusting the introduced crosstalk so that crosscorrelations between the separated noise patterns of the adjusted images tend toward zero.
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26. A system for correcting for the effects of crosscolor crosstalk between colors of a color image stored in an image storage medium and an imaging device used to scan the color image into a plurality of scanned images each corresponding to a color of the color image, comprising
means for identifying noise patterns in the plurality of scanned images; -
means for calculating crosscorrelations between the identified noise patterns in pairs of the scanned images; and means for correcting for color crosstalk in each of the scanned images according to the crosscolor correlations between noise patterns.
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Specification