Method and means for detecting people in image sequences
First Claim
Patent Images
1. A method of locating a person in a video picture, comprising the steps of:
- forming a differential image from time displaced video images to extract differential figures from the video images;
comparing local boundary curvature extremes of outlines of the differential figures with outlines of a stored model of at least a part of a human body which includes a head and a portion of the body immediately below the head; and
in response to the comparing step identifying a region in the video picture from the step of comparing the local boundary curvature extremes of outlines of the differential figures with outlines of the stored model of the head and the portion of the body immediately below the head;
the portion of the body immediately below the head being a neck.
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Abstract
The head in a series of video images is identified by digitizing sequential images, subtracting a previous image from an input image to determine moving objects, calculating boundary curvature extremes of regions in the subtracted image, comparing the extremes with a stored model of a human head to find regions shaped like a human head, and identifying the head with a surrounding shape.
125 Citations
49 Claims
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1. A method of locating a person in a video picture, comprising the steps of:
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forming a differential image from time displaced video images to extract differential figures from the video images; comparing local boundary curvature extremes of outlines of the differential figures with outlines of a stored model of at least a part of a human body which includes a head and a portion of the body immediately below the head; and in response to the comparing step identifying a region in the video picture from the step of comparing the local boundary curvature extremes of outlines of the differential figures with outlines of the stored model of the head and the portion of the body immediately below the head; the portion of the body immediately below the head being a neck. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 47, 48)
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6. An apparatus for locating a person in a video picture, comprising:
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a video device containing video images of a scene; a processor responsive to said video device for forming a differential image from a time displaced video images to extract differential figures;
comparing local boundary curvature extremes of outlines of the differential figures with outlines of a stored model of at least a part of a human body which includes a head and a portion of the body immediately below said head; and
identifying a region in the video picture in response to the comparing of the local boundary curvature extremes of outlines of the differential figures with outlines of the stored model of the head and the portion of the body immediately below the head;the portion of the body immediately below the head being a neck.
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24. An apparatus for locating a person in a video picture, comprising:
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a video device containing video images of a scene; a processor responsive to said video device for forming a differential image from a time displaced video images to extract differential figures;
comparing local boundary curvature extremes of outlines of the differential figures with outlines of a stored model of at least a part of a human body which includes a head and a portion of the body immediately below said head; and
identifying a region in the video picture in response to the comparing of the local boundary curvature extremes of outlines of the differential figures with outlines of the stored model of the head and the portion of the body immediately below the head;wherein said processor fits a surrounding shape to the portion of the region boundary corresponding to the head in the video images and the surrounding shape is an annulus. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 49)
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Specification