Detection correction of red-eye features in digital images
First Claim
1. A method of detecting red-eye features in a digital image, comprising:
- identifying pupil regions in the image by searching for a row of pixels having a predetermined saturation and/or lightness profile;
identifying further pupil regions in the image by searching for a row of pixels having a different predetermined saturation and/or lightness profile; and
determining whether each pupil region corresponds to part of a red-eye feature on the basis of further selection criteria.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of correcting red-eye features in a digital image includes generating a list of possible features by scanning through each pixel in the image searching for saturation and/or lightness profiles characteristic of red-eye features. For each feature in the list, an attempt is made to find an isolated area of correctable pixels which could correspond to a red-eye feature. Each successful attempt is recorded in a list of areas. Each area is then analysed to calculate statistics and record properties of that area, and validated using the calculated statistics and properties to determine whether or not that area is caused by red-eye. Areas not caused by red-eye and overlapping areas are removed from the list. Each area remaining is corrected to reduce the effect of red-eye. More than one type of feature may be identified in the initial search for features.
-
Citations
52 Claims
-
1. A method of detecting red-eye features in a digital image, comprising:
-
identifying pupil regions in the image by searching for a row of pixels having a predetermined saturation and/or lightness profile;
identifying further pupil regions in the image by searching for a row of pixels having a different predetermined saturation and/or lightness profile; and
determining whether each pupil region corresponds to part of a red-eye feature on the basis of further selection criteria. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 49, 50, 51, 52)
-
-
12. A method of correcting red-eye features in a digital image, comprising:
-
generating a list of possible features by scanning through each pixel in the image searching for saturation and/or lightness profiles characteristic of red-eye features;
for each feature in the list of possible features, attempting to find an isolated area of correctable pixels which could correspond to a red-eye feature;
recording each successful attempt to find an isolated area in a list of areas;
analysing each area in the list of areas to calculate statistics and record properties of that area;
validating each area using the calculated statistics and properties to determine whether or not that area is caused by red-eye;
removing from the list of areas those which are not caused by red-eye;
removing some or all overlapping areas from the list of areas; and
correcting some or all pixels in each area remaining in the list of areas to reduce the effect of red-eye. - View Dependent Claims (31, 41, 42, 43, 44, 45, 46, 47, 48)
-
-
14. A method of correcting an area of correctable pixels corresponding to a red-eye feature in a digital image, comprising:
-
constructing a rectangle enclosing the area of correctable pixels;
determining a saturation multiplier for each pixel in the rectangle, the saturation multiplier calculated on the basis of the hue, lightness and saturation of that pixel;
determining a lightness multiplier for each pixel in the rectangle by averaging the saturation multipliers in a grid of pixels surrounding that pixel;
modifying the saturation of each pixel in the rectangle by an amount determined by the saturation multiplier of that pixel; and
modifying the lightness of each pixel in the rectangle by an amount determined by the lightness multiplier of that pixel. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
- 32. A method of correcting a red-eye feature in a digital image, comprising adding a simulated highlight region of pixels having a high lightness to the red-eye feature.
-
37. A method of detecting red-eye features in a digital image, comprising:
determining whether a red-eye feature could be present around a reference pixel in the image by attempting to identify an isolated, substantially circular area of correctable pixels around the reference pixel, a pixel being classed as correctable if it satisfies at least one set of predetermined conditions from a plurality of such sets. - View Dependent Claims (38, 39, 40)
Specification