Color segmentation
First Claim
Patent Images
1. A method of skin segmentation of a digital image, said method operable in an image acquisition device, comprising:
- acquiring an image, including focusing an object through a lens onto an image sensor of an image acquisition device;
using a processor to comparea value indicative of a redness of a pixel of said image with a face skin pixel redness criterion; and
to identifysaid pixel as a face skin pixel if said criterion is satisfied, andwherein said image is in RGB colour space, and wherein said value comprises the R value of said pixel, andwherein said criterion comprises R>
G+K and R>
B+K, andwherein said criterion further comprises that an intensity of said pixel, I, is greater than 240.
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Abstract
A method of skin segmentation of a digital image is operable in an acquisition device. An image is acquired. A value indicative of a redness of a pixel of said image is compared with a face skin pixel redness criterion. The pixel is identified as a face skin pixel if said criterion is satisfied.
763 Citations
18 Claims
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1. A method of skin segmentation of a digital image, said method operable in an image acquisition device, comprising:
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acquiring an image, including focusing an object through a lens onto an image sensor of an image acquisition device; using a processor to compare a value indicative of a redness of a pixel of said image with a face skin pixel redness criterion; and
to identifysaid pixel as a face skin pixel if said criterion is satisfied, and wherein said image is in RGB colour space, and wherein said value comprises the R value of said pixel, and wherein said criterion comprises R>
G+K and R>
B+K, andwherein said criterion further comprises that an intensity of said pixel, I, is greater than 240. - View Dependent Claims (2, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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3. A method of skin segmentation of a digital image, said method operable in an image acquisition device, comprising:
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acquiring an image, including focusing an object through a lens onto an image sensor of an image acquisition device; using a processor to compare a value indicative of a redness of a pixel of said image with a face skin pixel redness criterion and to identify said pixel as a face skin pixel if said criterion is satisfied, and wherein said image is in RGB colour space, and wherein said value comprises the R value of said pixel, and wherein said criterion comprises R>
G+K and R>
B+K, where K comprises approximately
x*(pixel saturation+y)where x is in the range of approximately 0.53 to 0.6; and y is in the range of approximately 5 to 6.5. - View Dependent Claims (4)
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5. A method of skin segmentation of a digital image, said method operable in an image acquisition device, comprising:
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acquiring an image, including focusing an object through a lens onto an image sensor of an image acquisition device; using a processor to compare a value indicative of a redness of a pixel of said image with a face skin pixel redness criterion and to identify said pixel as a face skin pixel if said criterion is satisfied, and wherein said image is in YCC colour space, and wherein said value is a Cr value of said pixel, and wherein said criterion comprises;
Cr>
148.8162−
0.1626*Cb+0.4726*K and
Cr>
1.2639*Cb−
33.7803+0.133*K. - View Dependent Claims (6)
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7. A method of skin segmentation of a digital image, said method operable in an image acquisition device, comprising:
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acquiring an image, including focusing an object through a lens onto an image sensor of an image acquisition device; using a processor to compare a value indicative of a redness of a pixel of said image with a face skin pixel redness criterion and to identify said pixel as a face skin pixel if said criterion is satisfied, and wherein said image is in YCC colour space, and wherein said value is a Cr value of said pixel, and wherein said criterion comprises;
Cr>
148.8162−
0.1626*Cb+0.2836*(pixel saturation+5) and
Cr>
1.2639*Cb−
33.7803+0.4279*(pixel saturation+5)where pixel saturation is;
√
{square root over (((Cr−
128)2+(Cb−
128)2))}{square root over (((Cr−
128)2+(Cb−
128)2))}.
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8. A method of skin segmentation of a digital image, said method operable in an image acquisition device, comprising:
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acquiring an image, including focusing an object through a lens onto an image sensor of an image acquisition device; using a processor to compare a value indicative of a redness of a pixel of said image with a face skin pixel redness criterion and to identify said pixel as a face skin pixel if said criterion is satisfied, and wherein said image is in YCC colour space, and wherein said value is a Cr value of said pixel, and wherein said criterion further comprises an alternate condition that an intensity of said pixel, Y, is greater than 240.
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Specification