Post-processing generation of focus/defocus effects for computer

Details Post-processing generation of focus/defocus effects for computer Post-processing generation of focus/defocus effects for computer

1997-08-04

2000-03-07

Zimmerman, Mark K.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

345428, 345432, 345953, 348415, 382239, G06T 510

Patent

active

060346906

ABSTRACT:
A method and apparatus are described for post-processing a computer-generated image of a three-dimensional object for display as a pixel image. A focus depth is specified either by a user or from within the system for each image frame. The image pixels are grouped into non-overlapping blocks of adjoining image pixels with a single respective depth value pre-specified or calculated at run-time for each block. Each block is extracted in turn from the image and the pixels within a block are convolution filtered with a common set of filter coefficients. Padding may be applied to fill areas where a full filter kernel cannot be formed. The technique has particular suitability for MPEG-coded image streams where the existing MPEG macroblock specification may be taken advantage of.

REFERENCES:
patent: 5270813 (1993-12-01), Puri et al.
patent: 5301242 (1994-04-01), Gonzales et al.
"Synthetic Image Generation with a Lens and Aperture Camera Model" M. Potmesil and I. Chakravarty, ACM Transactions on Graphics vol. 1, No. 2, Apr. 1982, pp. 85-108.
"Two 2D Postprocessing Tools and their Applications to the Improvement of 3D Pictures" J.F. Colonna, The Visual Computer (1994), pp. 239-242.
"Computer Graphics: Principles and Practice" J.D. Foley, van Dam, Feiner and Hughes, 2nd Edition (1990), published by Addison-Wesley, ISBN 0-201-12110-7, at pp. 668-672.

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