DocumentCode :
2371262
Title :
An analytical ray casting of volume data
Author :
Jung, Moon-Ryul ; Park, Hyunwoo ; Paik, Doowon
Author_Institution :
Sch. of Comput., Soongsil Univ., Seoul, South Korea
fYear :
1998
fDate :
26-29 Oct 1998
Firstpage :
79
Lastpage :
86
Abstract :
When volume data is visualized by the ray casting method, the color value of each pixel in the image is obtained by composing the color contributions of the sample points that lie on the ray cast from the pixel point. In most ray tracing methods, including M. Levoy´s (1988; 1990) classical method, the color composition is formulated as a summation of the color contributions of the discrete sample points. However the more precise color composition is formulated as differential equations over the color contributions of the continuous sample points. The discrete formulation is used, because analytical solutions to the continuous formulation are hard to find. However we have discovered a semi-analytical solution to the continuous formulation of a typical ray tracing of volume data. We have applied both Levoy´s method and ours to the same set of data, and compared the visual quality of both results. The comparison shows that our method produces a more fine grained visualization of volume data
Keywords :
colour graphics; data visualisation; differential equations; ray tracing; Levoy method; analytical ray casting; color composition; color contributions; color value; continuous sample points; differential equations; discrete formulation; discrete sample points; fine grained visualization; pixel; precise color composition; ray casting method; ray tracing methods; sample points; semi analytical solution; visual quality; volume data visualization; Casting; Color; Computed tomography; Data visualization; Equations; Magnetic resonance imaging; Positron emission tomography; Ray tracing; Read only memory; Rendering (computer graphics);
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computer Graphics and Applications, 1998. Pacific Graphics '98. Sixth Pacific Conference on
Print_ISBN :
0-8186-8620-0
Type :
conf
DOI :
10.1109/PCCGA.1998.732031
Filename :
732031
Link To Document :
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