System for video based face recognition using an adaptive dictionary
First Claim
1. A method for assessing the presence of a subject in an area, the method comprising the steps of:
- capturing a plurality of photographs of the area over a period of time;
maintaining, over the period of time, a dictionary, the dictionary including;
a training matrix defined by a plurality of photographs of the area that are known with a defined level of certainty to include the subject, wherein a portion of the photographs in the training matrix at the beginning of the period define a static portion of the training matrix;
and an imposter collection defined by a plurality of photographs of the area in respect of which it is known that the subject does not appear, wherein the imposter collection is defined by a plurality of photographs of individuals other than the subject;
in respect of each photograph captured, and as each photograph is captured, carrying out a matching calculation, based upon a comparison of the photograph captured with the photographs in the dictionary to result in a measure of confidence that the subject is in the area;
carrying out a calculation using the measure of confidence resultant from the captured, photograph, the measure of confidence resultant from one of the previously captured photographs and the times of capture thereof and making a determination responsive thereto based upon a statistical inference from posterior probabilities;
and selectively replacing one of the photographs in the training matrix with the one of the previously captured the photographs responsive to the determination.
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Accused Products
Abstract
The method includes a dictionary including a target collection defined by images that are known with a defined level of certainty to include a subject and an imposter collection defined by images of individuals other than the subject. In the method, images of an area are captured over a period of time. In respect of each image: a matching calculation is carried out, based upon a comparison of the image captured with the images in the dictionary to result in a measure of confidence that the subject is in the area; and an inference determination is made to replace one of the target collection images with a further image that is known with the defined level of certainty, the determination being a function of the measure of confidence resultant from the captured image, the measure resultant from one or more previously captured images and the associated capture times.
12 Citations
15 Claims
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1. A method for assessing the presence of a subject in an area, the method comprising the steps of:
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capturing a plurality of photographs of the area over a period of time; maintaining, over the period of time, a dictionary, the dictionary including; a training matrix defined by a plurality of photographs of the area that are known with a defined level of certainty to include the subject, wherein a portion of the photographs in the training matrix at the beginning of the period define a static portion of the training matrix; and an imposter collection defined by a plurality of photographs of the area in respect of which it is known that the subject does not appear, wherein the imposter collection is defined by a plurality of photographs of individuals other than the subject; in respect of each photograph captured, and as each photograph is captured, carrying out a matching calculation, based upon a comparison of the photograph captured with the photographs in the dictionary to result in a measure of confidence that the subject is in the area; carrying out a calculation using the measure of confidence resultant from the captured, photograph, the measure of confidence resultant from one of the previously captured photographs and the times of capture thereof and making a determination responsive thereto based upon a statistical inference from posterior probabilities; and selectively replacing one of the photographs in the training matrix with the one of the previously captured the photographs responsive to the determination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification