Volume rendering method which increases apparent opacity of semi

Details Volume rendering method which increases apparent opacity of semi Volume rendering method which increases apparent opacity of semi

1994-06-16

1996-03-12

Herndon, Heather R.

395124, 395131, G06T 1550

Patent

active

054993237

ABSTRACT:
Portions showing greater specular reflection of an object to be displayed are displayed with pixels whose opacity, .alpha..sub.1, is emphasized according to the specular reflected component of a shading model, in which case the specular reflected component thus calculated for shading is also utilized for arithmetic operation of emphasized opacity, .alpha..sub.1, and high-speed processing is sought through tabulating various variables such as .alpha..sub.s (an additional opacity introduced for emphasis by a specular reflected component), .alpha..sub.n (a primary opacity), and G (a gradient vector).

REFERENCES:
patent: 5222203 (1993-06-01), Obata
patent: 5363477 (1994-11-01), Kuragano et al.
Nayar, Shree K. et al, "Surface Reflection: Physical and Geometric Perspectives," IEEE Transactions on Pattern Analysis & Machine Intelligence, pp. 611-634, (1991).
Park, Jong-Seok, et al, "Highlight Separation and Surface Orientations for 3-D Specular Objects," Pattern Recognition, 1990 10th International Conference, pp. 331-335, (1990).
Wolf, Lawrence B., "Diffuse Reflection," Computer Vision and Pattern Recognition, pp. 472-478, (1992).
Foley, James D., et al, Computer Graphics: Principles and Practices, Addison-Wesley Publishing Co., 2nd ed. pp. 728-741, 754-758 and 772-775, (1990).
Montine, James L., "A Procedural Interface for Volume Rendering," Visualization, Conference, pp. 36-44, (1990).

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