Color segmentation
View Patent ↗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.
1. A method of a skin segmentation of a digital image, said method performed by an image acquisition device, comprising:
acquiring an image using a lens and an image sensor of an image acquisition device;
determining, using a processor, a face skin pixel redness value indicative of a redness of a pixel of said image, and identifying said pixel as a face skin pixel if said pixel of said image satisfies a criterion;
wherein said pixel of said image is represented in a YCC colour space;
wherein said face skin pixel redness value is a Cr value of said pixel represented in the YCC colour space;
wherein said pixel of said image satisfies said criterion if:
Cr>k1−k2*Cb, and
Cr>k3*Cb−k4, wherein k1, k2, k3, and k4 comprise constants.
2. The method of claim 1 , wherein said criterion is further comprises satisfied if an intensity Y of said pixel is greater than 240.
3. The method of claim 1 , further comprising partitioning said image into one or more regions of similar colors and wherein said face skin pixel redness value comprises an average pixel value for one of said one or more regions.
4. The method of claim 1 , further comprising partitioning said image into one or more regions of pixels having been identified as face skin pixels.
5. The method of claim 1 , wherein said determining provides a real value and wherein said method further comprises providing a contour map of a region comprising said real value.
6. A non-transitory, tangible computer program product comprising computer program code which when executed on a computing device is arranged to perform a method of a skin segmentation of an image, said method performed by an image acquisition device, wherein the method comprises:
determining, using a processor, a face skin pixel redness value indicative of a redness of a pixel of an image acquired using a lens and an image sensor of an image acquisition device, and identifying said pixel as a face skin pixel if said pixel of said image satisfies a criterion;
wherein said pixel of said image is represented in a YCC colour space;
wherein said face skin pixel redness value is a Cr value of said pixel represented in the YCC colour space;
wherein said pixel of said image satisfies said criterion if:
Cr>k1−k2*Cb, and
Cr>k3*Cb−k4, wherein k1, k2, k3, and k4 comprise constants.
7. The non-transitory, tangible computer program product of claim 6 , wherein said criterion is further satisfied if an intensity Y of said pixel is greater than 240.
8. The non-transitory, tangible computer program product of claim 6 , wherein the computer program code further comprises instructions for partitioning said image into one or more regions of similar colors, and wherein said face skin pixel redness value comprises an average pixel value for one of said one or more regions.
9. The non-transitory, tangible computer program product of claim 6 , wherein the computer program code further comprises instructions for partitioning said image into one or more regions of pixels having been identified as face skin pixels.
10. The non-transitory, tangible computer program product of claim 6 , wherein the computer program code further comprises instructions for providing a contour map of a region comprising a real value.
11. A digital image acquisition and
processing device comprising: a lens;
an image sensor;
a controller; and
a memory having code embedded therein for programming the controller to perform a method of a skin segmentation of an image, wherein the method comprises:
determining, using the controller, a face skin pixel redness value indicative of a redness of a pixel of the image acquired using the lens and the image sensor, and identifying said pixel as a face skin pixel if said pixel of said image satisfies a criterion;
wherein said pixel of said image is in a YCC colour space;
wherein said face skin pixel redness value is a Cr value of said pixel represented in the YCC colour space;
wherein said pixel of said image satisfies said criterion if:
Cr>k1−k2*Cb, and
Cr>k3*Cb−k4, wherein k1, k2, k3, and k4 comprise constants.
12. The device of claim 11 , wherein said criterion is further satisfied if an intensity Y of said pixel is greater than 240.
13. The device of claim 11 , wherein the controller is further configured to perform: partitioning said image into one or more regions of similar colors and wherein said face skin pixel redness value comprises an average pixel value for one of said one or more regions.
14. The device of claim 11 , wherein the controller is further configured to perform: partitioning said image into one or more regions of pixels having been identified as face skin pixels.
15. The device of claim 11 , wherein said controller is further configured to perform: providing a contour map of a region comprising a real value.