Detecting redeye defects in digital images
First Claim
Patent Images
1. A method for correcting a defect in a digital image containing an eye, the method comprising:
- converting the digital image into an intensity image,identifying a group of pixels containing an eye region within the intensity image;
segmenting the group of pixels containing the eye region of the intensity image into segments each having a local intensity extremum,thresholding a corresponding portion of the digital image to identify at least two regions of relatively extreme intensity, including a pupil and one or both of an iris or an eyelid;
selecting a region from the at least two regions identified in the thresholding step having the most extreme average intensity, andidentifying segments from the segmenting step intersecting the region selected at selecting step according to a pre-determined criterion, andwherein the thresholding step uses a threshold obtained by identifying the most extreme intensity pixel inside the intensity image, computing the average intensity of the pixels inside a smaller rectangle centered on the most extreme intensity pixel, and assigning the threshold to the sum of the average intensity and a fixed quantity.
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Abstract
A method for detecting a redeye defect in a digital image containing an eye comprises converting the digital image into an intensity image, and segmenting the intensity image into segments each having a local intensity maximum. Separately, the original digital image is thresholded to identify regions of relatively high intensity and a size falling within a predetermined range. Of these, a region is selected having substantially the highest average intensity, and those segments from the segmentation of the intensity image whose maxima are located in the selected region are identified.
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14 Claims
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1. A method for correcting a defect in a digital image containing an eye, the method comprising:
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converting the digital image into an intensity image, identifying a group of pixels containing an eye region within the intensity image; segmenting the group of pixels containing the eye region of the intensity image into segments each having a local intensity extremum, thresholding a corresponding portion of the digital image to identify at least two regions of relatively extreme intensity, including a pupil and one or both of an iris or an eyelid; selecting a region from the at least two regions identified in the thresholding step having the most extreme average intensity, and identifying segments from the segmenting step intersecting the region selected at selecting step according to a pre-determined criterion, and wherein the thresholding step uses a threshold obtained by identifying the most extreme intensity pixel inside the intensity image, computing the average intensity of the pixels inside a smaller rectangle centered on the most extreme intensity pixel, and assigning the threshold to the sum of the average intensity and a fixed quantity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13, 14)
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9. A method for correcting a defect in a digital image containing an eye, the method comprising:
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converting the digital image into an intensity image, identifying a group of pixels containing an eye region within the intensity image; segmenting the group of pixels containing the eye region of the intensity image into segments each having a local intensity extremum, thresholding a corresponding portion of the digital image to identify at least two regions of relatively extreme intensity, including a pupil and one or both of an iris or an eyelid; selecting a region from the at least two regions identified in the thresholding step having the most extreme average intensity, and identifying segments from the segmenting step intersecting the region selected at selecting step according to a pre-determined criterion, and wherein the average intensities of the at least two regions from the thresholding step having the most extreme and next most extreme average intensities differ by more than a predetermined amount, and the region selected at the selecting step comprises a region having the most extreme average intensity. - View Dependent Claims (10)
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11. A method for correcting a defect in a digital image containing an eye, the method comprising:
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converting the digital image into an intensity image, identifying a group of pixels containing an eye region within the intensity image; segmenting the group of pixels containing the eye region of the intensity image into segments each having a local intensity extremum, thresholding a corresponding portion of the digital image to identify at least two regions of relatively extreme intensity, including a pupil and one or both of an iris or an eyelid; selecting a region from the at least two regions identified in the thresholding step having the most extreme average intensity, and identifying segments from the segmenting step intersecting the region selected at selecting step according to a pre-determined criterion, and wherein the average intensities of the at least two regions from the thresholding step having the most extreme and next most extreme average intensities differ by less than a predetermined amount, and the region selected at the selecting step comprises a region having the most extreme average saturation. - View Dependent Claims (12)
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Specification