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单词 B-Spline
释义

B-Spline

A generalization of the Bézier Curve. Let a vector known as the Knot Vector bedefined

(1)

where is a nondecreasing Sequence with , and define control points , ...,. Define the degree as
(2)

The ``knots'' , ..., are called Internal Knots.


Define the basis functions as

(3)
 
   (4)

Then the curve defined by
(5)

is a B-spline. Specific types include the nonperiodic B-spline (first knots equal 0 and last equal to 1) anduniform B-spline (Internal Knots are equally spaced). A B-Spline with no InternalKnots is a Bézier Curve.


The degree of a B-spline is independent of the number of control points, so a low order can always be maintained forpurposes of numerical stability. Also, a curve is times differentiable at a point where duplicate knotvalues occur. The knot values determine the extent of the control of the control points.

See also Bézier Curve, NURBS Curve
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更新时间:2024/11/15 3:34:42