Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Patent
1995-10-25
1999-11-16
Nguyen, Phu K.
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
G06F 1500
Patent
active
059866594
ABSTRACT:
A post-processing method and apparatus to produce focus/defocus effects in computer generated images of three dimensional objects. A convolution filter stores pixel values (V) and associated depth values (Z) with a filter kernel being selected from a look-up table in dependence of the depth of the centre pixel (Z.sub.c) in relation to a specified focus depth (P). To minimize spurious effects where filter kernels overlap objects at different depths in the image, an inhibition function stage varies the amount by which each pixel contributes to the kernel in dependence on that pixel's depth value (Z) and the centre pixel and focus depth values (Z.sub.c and P). Inhibition profiles over a range of contributing and centre pixel values are provided.
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"Synthetic Image Generation with a Lens and Aperture Camera Model" by M. Potmesil and I. Chakravarty, ACM Transactions on Graphics, vol. 1, No. 2, Apr. 1982, pp. 85-108.
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"Computer Graphics--Principles and Practice" by Foley, van Dam, Feiner and Hughes Section Edition (1990) published by Addison Wesley, ISBN 0-201-12110-7.
Gallery Richard D.
Winser Paul A.
Nguyen Phu K.
Rubin Steven S.
U.S. Philips Corporation
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