Editorial Statement 1996 was an unusual year for Computing Surveys, with two special issues: one devoted to perspectives in computing (March) and the other to strategic directions in computing (December). We would like to hear from readers about these issues, and more generally about whether the new look that mixes traditional papers with symposia of short papers on special topics serves the readership (please send mail to csur@acm.org). The present issue returns to a traditional form with three papers on image coding, nondeterminism, and cache coherence. Reid, Millar, and Black in their paper distinguish second-generation image coding, which makes use of geometrical features of images, from first-generation coding based on pixel representation. It examines image sensitivity of the human visual system and techniques like multiscale edge detection and digital filtering that take this semantics into account. Visual pattern-based approaches using quadtrees are contrasted with segmentation-based approaches using techniques such as polynomial approximation, region-growing, split and merge techniques, and fractal coding techniques. Contour-coding-based approaches with lossy coding and lossless compression are examined. The conclusion views image coding as a two-stage modeling and coding process and reexamines previously discussed techniques in terms of their modeling and coding strategies. The mix
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Editorial statement
Wegner, Peter
Follow ACM Computing Surveys (CSUR)
, Volume 29 (1)
Association for Computing Machinery – Mar 1, 1997
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