Learning 3D Object Recognition Models from 2D Images
Arthur R. Pope, David G. Lowe · 1993
To recognize an object in an image one must have some internal model of how that object may appear. We show how to learn such a model from a series of training images depicting a class of objects. The model represents a 3D object by a set of characteristic views, each defining a probability distribution over variation in object appear-ance. Features identified in an image through perceptual organization are represented by a graph whose nodes include feature labels and numeric measurements. Image graphs are partitioned into characteristic views by an incremental conceptual clustering algorithm. A learning procedure generalizes multiple image graphs to form a characteristic view graph in which the numeric measure-ments are described by probability distributions. A match-ing procedure, using a similarity metric based on a non– parametric probability density estimator, compares image and characteristic view graphs to identify an instance of a modeled object in an image. We present experimental results from a system constructed to test this approach. The system is demonstrated learning to recognize partially occluded objects in images using shape cues. 1.