Attribute blending system for composing computer-graphic images

Details Attribute blending system for composing computer-graphic images Attribute blending system for composing computer-graphic images

1994-09-22

1996-02-06

Zimmerman, Mark K.

395131, 395132, G06T 1540

Patent

active

054902380

ABSTRACT:
Objects contending for representation in pixels of a graphics display selectively are awarded a fractional area within a pixel on the basis of: coarse calculations in the Z dimension, aggregate demands of the objects and blending techniques free of binary position resolutions. Specifically, the area occupied by a polygon within a pixel is represented using a single number .alpha., which may variously be defined, for example, a value of "0" indicates no area occupied within the pixel, while a value of "255" indicates full pixel coverage. Fine calculations in the Z dimension for binary resolutions are avoided by the blending techniques with attendant antialiasing. A chain of mixer units for storage and blending in pipeline processing compensate the non-associative characteristic of repeated blending.

REFERENCES:
patent: 4677576 (1987-06-01), Berlin, Jr. et al.
patent: 4748572 (1988-05-01), Latham
patent: 4807158 (1989-02-01), Blanton et al.
patent: 4992780 (1991-02-01), Penna et al.
patent: 5063375 (1991-11-01), Lien et al.

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