We introduce a generic and efficient method for 2D and 3D shape estimation via density fields. Our method models shape as a density map and uses the notion of density to fit a model to a rapidly computed occupancy map of the foreground object. We show how to utilize hierarchical (pyramid-like) object segmentation data to regularize a hierarchical model fitting. With primary focus on estimating 3D shapes of non-rigid articulated objects such as human bodies, we illustrate our approach with examples of efficient model fitting to 3D occupancy maps of human figures. We also discuss a number of extensions of our method to applications involving non-rigid object tracking and movement analysis. Recently we have started developing a radial-based density framework for learning and fitting models to shapes of various complexities. This framework allows to model shapes in a systematic way and offers numerous performance benefits with respect to our previous approach. In addition, we are exploring density models being fitted to grayscale volume and area data. Major contributions
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