Frequency Analysis of Gradient Estimators in Volume Rendering


Bentum, Mark J. and Lichtenbelt, Barthold B.A. and Malzbender, Tom (1996) Frequency Analysis of Gradient Estimators in Volume Rendering. IEEE transactions on visualization and computer graphics, 2 (3). pp. 242-254. ISSN 1077-2626

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Abstract:Gradient information is used in volume rendering to classify and color samples along a ray. In this paper, we present an analysis of the theoretically ideal gradient estimator and compare it to some commonly used gradient estimators. A new method is presented to calculate the gradient at arbitrary sample positions, using the derivative of the interpolation filter as the basis for the new gradient filter. As an example, we will discuss the use of the derivative of the cubic spline. Comparisons with several other methods are demonstrated. Computational efficiency can be realized since parts of the interpolation computation can be leveraged in the gradient estimation
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Copyright:© 1996 IEEE
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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