1. A method in a computing device for authenticating a target object, the method comprising: for each of a plurality of objects, providing a model of patterns of the object derived from a classifier-specific feature vector for each of a plurality of classifiers, a classifier-specific feature vector having classifier-specific features extracted from the patterns of the object; receiving a target pattern of the target object and an indication of a purported object that the target pattern is purported to match; generating by the computing device a target classifier-specific feature vector for each of the plurality of classifiers, the target classifier-specific feature vector having classifier-specific features from the target pattern; generating by the computing device a classifier score for each classifier based on comparison of the target classifier-specific feature vector for that classifier to the model of the purported object for that classifier and comparison of the target classifier-specific feature vector for that classifier to the model of an object other than the purported object; and generating by the computing device an overall score indicating that the target object matches the purported object from the classifier scores.