The spectrum of a prediction-error filter (PEF) tends toward the inverse spectrum of the data from which it is estimated. I compute 2-D PEF’s from known “training images” and use them to synthesize similar-looking textures from random numbers via helix deconvolution. Compared to a similar technique employing Fourier transforms, the PEF-based method is generally more flexible, due to its ability...

Some parallel applications do not require a precise imitation of the behaviour of the physically shared memory programming model. Consequently, certain parallel machine architectures have elected to emphasise different required coherency properties because of possible efficiency gains. This has led to various definitions of models of store coherency. These definitions have not been amenable t o...