Luttrell S P, November 1990, A trainable texture anomaly detector using the Adaptive Cluster Expansion (ACE) method, RSRE technical report (Malvern, UK), 4437
We derive an adaptive hierarchical maximum entropy estimate of probability density functions, whose mathematical structure suggests the name 'adaptive cluster expansion' (ACE). We apply ACE to the problem of locating statistically anomalous regions in otherwise homogeneous textured images, which we demonstrate using several images of Brodatz textures.