DTs: Dynamic Trees

Experiments show that dynamic trees are capable of generating images that are less blocky, and the models have better translation invariance properties than a fixed, "balanced" TSBN.

Abstract

In this paper we introduce a new class of image models, which we call dynamic trees or DTs. A dynamic tree model specifies a prior over a large number of trees, each one of which is a tree-structured belief net (TSBN). Experiments show that DTs are capable of generating images that are less blocky, and the models have better translation invariance properties than a fixed, balanced TSBN. We also show that Simulated Annealing is effective at finding trees which have high posterior probability.