|Author||Goldman, Ronald N. ♦ Barry, Phillip J.|
|Source||ACM Digital Library|
|Publisher||Association for Computing Machinery (ACM)|
|Subject Domain (in DDC)||Computer science, information & general works ♦ Data processing & computer science|
|Subject Keyword||Recursive evaluation algorithm ♦ Neville's algorithm ♦ De boor algorithm ♦ Lagrange polynomial ♦ Catmull-rom spline ♦ B-spline|
|Abstract||It is known that certain Catmull-Rom splines  interpolate their control vertices and share many properties such as affine invariance, global smoothness, and local control with B-spline curves; they are therefore of possible interest to computer aided design. It is shown here that another property a class of Catmull-Rom splines shares with B-spline curves is that both schemes possess a simple recursive evaluation algorithm. The Catmull-Rom evaluation algorithm is constructed by combining the de Boor algorithm for evaluating B-spline curves with Neville's algorithm for evaluating Lagrange polynomials. The recursive evaluation algorithm for Catmull-Rom curves allows rapid evaluation of these curves by pipelining with specially designed hardware. Furthermore it facilitates the development of new, related curve schemes which may have useful shape parameters for altering the shape of the curve without moving the control vertices. It may also be used for constructing transformations to Bézier and B-spline form.|
|Description||Affiliation: Computer Graphics Laboratory, Computer Science Dept., Univ. of Waterloo, Waterloo, Ontario, Canada N2L 3G1 (Barry, Phillip J.; Goldman, Ronald N.)|
|Age Range||18 to 22 years ♦ above 22 year|
|Education Level||UG and PG|
|Learning Resource Type||Article|
|Publisher Place||New York|
|Journal||ACM SIGGRAPH Computer Graphics (COMG)|
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