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units, P = ωT , where P is in watts, T is in newton-meters, and ω is in rads per second. media-access control a sublayer of the link layer protocol whose implementation is medial axis a subset of blob pixels that are centers of maximal lines, squares, or disks let X be a non-empty bounded set in a Eu- clidean space; assume that X is topologically closed, in other words it contains its border d(x, X c ) of x to the complement X c of X is equal to the distance d(x, ∂X) of x to the border ∂X; let B(x) be the closed ball of radius d(x, ∂X) centered about x; it is the greatest closed ball centered about x and in- cluded in X. The medial axis transfor is the operation transforming X into its medial axis or distance skeleton S(X) which can be de- fined in several ways: 1. S(X) is the set of points x such that B(x) is not included in B(y) for any other y in X; in other words B(x) is, among all balls included in X, maximal for the inclusion. 2. S(X) is the set of points x such that B(x) intersects ∂X in at least two points. 3. S(X) is the set of points x at which the distance function f (x) = d(x, ∂X) is not differentiable. These three definitions coincide up to clo- sure, in the sense that the three skeletons that X is con- nected and has a connected interior, its skele- S(X) is also connected and has the same number of holes as X. For digital figures and a digital distance d, one uses only the first definition: the skeleton d) included in X; but then the skeleton of a connected set is medial axis transform (MAT) See median filter a filter that takes the me- dian of the various input signal components medical imaging a multi-disciplinary field that uses imaging scanners to reveal See also and radiog- raphy . medium-scale integration (MSI) (1) an early level of integration circuit fabrication (2) a single packaged IC device with 12 to 99 gate-equivalent circuits. megacell a cell with the radius of 20– 100 km. See also megaflop (MFLOP) one million floating point operations per second. Usually applied meggar a power system device for mea- suring high-voltage insulation or ground con- mel scale the mel is the unit of pitch. Mellin transform a transform often arises in the study of wideband signals. The Mellin F M (s) of a function f (t) defined on the positive real axis 0 < t < ∞ is F M (s) = Z ∞ 0 f (t)t s−1 dt. c 2000 by CRC Press LLC |