Face detection
First Claim
1. Video face detection apparatus in which a test image from a video sequence is compared with an image property model derived from image properties of a region detected to contain a face in a preceding image in said video sequence;
- said apparatus comprising;
(i) a selector to select a predetermined proportion of pixels in said region detected to contain a face in said preceding image which most closely match said image property model derived in respect of that region, thereby deriving a pixel mask;
(ii) a comparator to compare pixels in said test image defined by said pixel mask with said image property model, said mask being applied at more than one image position within said test image;
a face being detected in said test image at a mask position corresponding to a lowest average difference between said image property model and pixels defined by said mask at that position.
1 Assignment
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Accused Products
Abstract
Video face detection apparatus in which a test image from a video sequence is compared with an image property model derived from image properties of a region detected to contain a face in a preceding image in the video sequence comprises:
means for selecting a predetermined proportion of pixels in the region detected to contain a face in the preceding image which most closely match the image property model derived in respect of that region, thereby deriving a pixel mask; and
means for comparing pixels in the test image defined by the pixel mask with the image property model, the mask being applied at more than one image position within the test image; a face being detected in the test image at a mask position corresponding to a lowest average difference between the image property model and pixels defined by the mask at that position.
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Citations
14 Claims
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1. Video face detection apparatus in which a test image from a video sequence is compared with an image property model derived from image properties of a region detected to contain a face in a preceding image in said video sequence;
- said apparatus comprising;
(i) a selector to select a predetermined proportion of pixels in said region detected to contain a face in said preceding image which most closely match said image property model derived in respect of that region, thereby deriving a pixel mask;
(ii) a comparator to compare pixels in said test image defined by said pixel mask with said image property model, said mask being applied at more than one image position within said test image;
a face being detected in said test image at a mask position corresponding to a lowest average difference between said image property model and pixels defined by said mask at that position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- said apparatus comprising;
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10. A video face detection method in which a test image from a video sequence is compared with an image property model derived from image properties of a region detected to contain a face in a preceding image in said video sequence;
- said method comprising the steps of;
(i) selecting a predetermined proportion of pixels in said region detected to contain said face in said preceding image which most closely match said image property model derived in respect of that region, thereby deriving a pixel mask; and
(ii) comparing pixels in said test image defined by said pixel mask with said image property model, said mask being applied at more than one image position within said test image;
said face being detected in said test image at a mask position corresponding to a lowest average difference between said image property model and pixels defined by said mask at that position. - View Dependent Claims (11, 12, 13)
- said method comprising the steps of;
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14. A medium according to claim 14, said medium being a transmission medium.
Specification