Ridges in Image and Data Analysis by David Eberly (auth.)

By David Eberly (auth.)

The thought of ridges has seemed various occasions within the photograph processing liter­ ature. occasionally the time period is utilized in an intuitive experience. different occasions a concrete definition is supplied. In just about all situations the idea that is used for terribly particular ap­ plications. whilst interpreting photos or information units, it's very common for a scientist to degree serious habit through contemplating maxima or minima of the information. those severe issues are fairly effortless to compute. Numerical programs consistently offer aid for root discovering or optimization, no matter if or not it's via bisection, Newton's approach, conjugate gradient procedure, or different regular equipment. It has no longer been traditional for scientists to think about serious habit in a higher-order feel. The con­ cept of ridge as a manifold of serious issues is a normal extension of the concept that of neighborhood greatest as an remoted serious element. in spite of the fact that, virtually no awareness has been given to formalizing the concept that. there's a desire for a proper improvement. there's a desire for realizing the computation concerns that come up within the imple­ mentations. the aim of this booklet is to deal with either wishes through delivering a proper mathematical starting place and a computational framework for ridges. The meant viewers for this ebook contains a person drawn to exploring the use­ fulness of ridges in facts analysis.

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Intuitively this seems reasonable since the longest axes of the ellipsoidal level sets lie on the x-axis. The 2-dimensional ridge points consist of the xy- plane since v~ D f = 0 implies z = O. This set also makes 45 Ridges in Image and Data Analysis intuitive sense since the ellipsoidal level sets are flattest in the z- direction . 3 shows volume renderings of ellipsoids with the I- dimensional ridges and 2dimensional ridges highlighted. 3. Ridges of different dimensions. The main technical difficulty with the height ridge definition is the zero test for directional derivatives Vi .

The two sets of components are related by observing c· Vi = (dVj)' vi = d(Vj' Vi), so = 9ijd. 1) Note that in Cartesian space where Ci = ci , so the distinction between covariant and contravariant is irrelevant. As a matrix equation, the matrix G = [gij] can be inverted to produce another equation relating the covariant and contravariant components. 2) Note that the metric and its inverse satisfy gikgkj = D; where the right-hand side is still the Kronecker delta, but the indices have been placed to match the positions of those on the left-hand side of the equation.

Differentiating f(y(t)) == 0 yields y'(t)· Df(y(t)) == O. At t = 0, T· Df(x) = 0, which is to be expected since Df is in the normal direction. Differentiating again yields y'( t) . D2 f(y( t) )y'( t) + y"( t) . Df(y(t)) == O. Evaluating at t = 0 yields 0 = T· D2 f(x)T + y"(O) . Df(x) = T· D2 f(x)T + KT(X)IDf(x)l. The curvature associated with the tangent direction Tis KT(X) D2 f(x) = -T· IDf(x)IT. The right-hand side is a quadratic form in 3-space which is restricted to the 2dimensional tangent space of the surface.

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