We develop a framework for learning generic, expressive image priors that capture the statistics of natural scenes and can
be used for a variety of machine vision tasks. The approach provides a practical method for learning high-order Markov random
field (MRF) models with potential functions that extend over large pixel neighborhoods. These clique potentials are modeled
using the Product-of-Experts framework that uses non-linear functions of many linear filter responses. In contrast to previous
MRF approaches all parameters, including the linear filters themselves, are learned from training data. We demonstrate the
capabilities of this
Field-of-Experts model with two example applications, image denoising and image inpainting, which are implemented using a simple, approximate
inference scheme. While the model is trained on a generic image database and is not tuned toward a specific application, we
obtain results that compete with specialized techniques.
Keywords Markov random fields - Low-level vision - Image modeling - Learning - Image restoration
The work for this paper was performed while S.R. was at Brown University.