Adaptive bayes image correlation
First Claim
1. A method for classifying and locating a target in a digital search image, comprising the steps of:
- receiving target reference images descriptive of said target and an estimate of the a priori probability of said target in said digital search image;
forming a plurality of labeled target measurement vectors from said target reference images;
receiving said digital search image;
forming a plurality of unlabeled measurement vectors from said digital search image;
executing a training stage using said a priori probability of said target in said digital search image, said labeled target measurement vectors, and said of unlabeled measurement vectors from said digital search image, including a step of least squares estimation of a Bayes parameter weighting vector;
forming a two dimensional Bayes target matching-template from said Bayes parameter weighting vector;
correlating said two-dimensional Bayes target matching-template with said digital search image using a spatial domain template-matching image correlation method; and
executing an adaptive Bayes classifier to identify objects as either said target or as not-target and determining said target location in said digital search image.
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Abstract
This invention relates generally to a system and method for correlating two images for the purpose of identifying a target in an image where templates are provided a priori only for the target. Information on other objects in the image being searched may be unavailable or difficult to obtain. This invention treats the design of target matching-templates and target matched-filters for image correlation as a statistical pattern recognition problem. By minimizing a suitable criterion, a target matching-template or a target matched-filter is estimated which approximates the optimal Bayes discriminant function in a least-squares sense. Both Bayesian image correlation methods identify the target with minimum probability of error while requiring no prior knowledge of other objects in the image being searched. The system and method is adaptive in that it can be re-optimizing (adapted) to recognize the target in a new search image using only information from the new image.
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Citations
15 Claims
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1. A method for classifying and locating a target in a digital search image, comprising the steps of:
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receiving target reference images descriptive of said target and an estimate of the a priori probability of said target in said digital search image; forming a plurality of labeled target measurement vectors from said target reference images; receiving said digital search image; forming a plurality of unlabeled measurement vectors from said digital search image; executing a training stage using said a priori probability of said target in said digital search image, said labeled target measurement vectors, and said of unlabeled measurement vectors from said digital search image, including a step of least squares estimation of a Bayes parameter weighting vector; forming a two dimensional Bayes target matching-template from said Bayes parameter weighting vector; correlating said two-dimensional Bayes target matching-template with said digital search image using a spatial domain template-matching image correlation method; and executing an adaptive Bayes classifier to identify objects as either said target or as not-target and determining said target location in said digital search image. - View Dependent Claims (2, 3, 4, 5, 6, 13)
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7. A method for classifying and locating a target in a digital search image, comprising the steps of:
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receiving target reference images descriptive of said target and an estimate of the a priori probability of said target in said digital search image; forming a plurality of labeled target measurement vectors from said target reference images; receiving said digital search image; forming a plurality of unlabeled measurement vectors from said digital search image; executing a training stage using said a priori probability of said target in said digital search image, said labeled target measurement vectors, and said of unlabeled measurement vectors from said digital search image, including a step of least squares estimation of a Bayes parameter weighting vector; forming a two dimensional Bayes target matching-template from said Bayes parameter weighting vector; correlating said two-dimensional Bayes target matching-template with said digital search image using a frequency domain matched-filter image correlation method; and executing an adaptive Bayes classifier to identify objects as either said target or as not-target and determining said target location in said digital search image. - View Dependent Claims (8, 9, 10, 11, 12, 14, 15)
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Specification