Read e-book online A Sampler of Useful Computational Tools for Applied PDF

By Daniel Cohen-Or, Chen Greif, Tao Ju, Niloy J. Mitra, Ariel Shamir, Olga Sorkine-Hornung, Hao (Richard) Zhang

ISBN-10: 1498706304

ISBN-13: 9781498706308

A Sampler of worthwhile Computational instruments for utilized Geometry, special effects, and picture Processing exhibits find out how to use a suite of mathematical thoughts to unravel very important difficulties in utilized arithmetic and machine technological know-how components. The e-book discusses primary instruments in analytical geometry and linear algebra. It covers a variety of subject matters, from matrix decomposition to curvature research and crucial part research to dimensionality reduction.

Written by means of a crew of hugely revered professors, the booklet can be utilized in a one-semester, intermediate-level path in machine technology. It takes a realistic problem-solving method, fending off distinct proofs and research. appropriate for readers with no deep educational historical past in arithmetic, the textual content explains how one can clear up non-trivial geometric difficulties. It quick will get readers up to the mark on various instruments hired in visible computing and utilized geometry.

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Additional resources for A Sampler of Useful Computational Tools for Applied Geometry, Computer Graphics, and Image Processing

Example text

We define variance along a direction as the variance (or the amount of scatter) among the points when projected onto that direction. Now let us look more closely into the expression of variance. , v = 1.

Pi d(l, pi ) ... 6: An LS line fit for a given set of unweighted points is not robust to outliers (left). As a solution, we progressively down-weigh points that are far from the fitted line, thus invoking a weighted LS solution. A monotonically decreasing function based on distance of points from the current LS line can be used as point weights for the next iteration. For example, one popular choice for the weight function is wj+1 := exp(−d(lj , pi )/σ), where j denotes the iteration number and σ is a user parameter controlling the falloff of the weights.

15) In the LS sense, we are trying to minimize i zi − F (xi , yi ) 2 . By now we easily recognize the familiar LS setup. Again, it is possible to have a procedure robust to outliers by introducing weights or confidence. In the weighted formulation, 2 we minimize i wi zi − F (xi , yi ) , where wi ≥ 0. Typically, we choose a weight function such that weights get smaller as the distance from the point p increases. A popular choice of such a weight function is exponential decay. Least-Squares Solutions 43 Concluding remarks In this chapter, we have learned about Least-Squares fitting and solution.

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A Sampler of Useful Computational Tools for Applied Geometry, Computer Graphics, and Image Processing by Daniel Cohen-Or, Chen Greif, Tao Ju, Niloy J. Mitra, Ariel Shamir, Olga Sorkine-Hornung, Hao (Richard) Zhang


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