Graphic display apparatus with improved shading capabilities

Details Graphic display apparatus with improved shading capabilities Graphic display apparatus with improved shading capabilities

1994-01-21

1996-03-12

Herndon, Heather R.

395126, G06T 1550

Patent

active

054993245

ABSTRACT:
A graphic display apparatus includes a geometry transforming part for inputting graphic data of a target object and transforming the graphic data into coordinate values of a device coordinate system which is used by the graphic display apparatus, an area calculation part for calculating an area of a polygon which generates an image based on the transformed coordinate values of the device coordinate system, a shading technique selection part for selecting a shading technique corresponding to the area of the polygon calculated by the area calculation part from a plurality of shading techniques which are determined in advance depending to the calculated area, a luminance calculation part for calculating a luminance of the graphic data of the target object according to the shading technique selected by the shading technique selection part, and a dot developing part for developing the graphic data of the target object for which the luminance is calculated by the luminance calculation part into dots.

REFERENCES:
patent: 4862391 (1989-08-01), Ohhashi
patent: 5083287 (1992-01-01), Obata et al.
patent: 5163126 (1992-11-01), Einkauf et al.
patent: 5253339 (1993-10-01), Well et al.
patent: 5379371 (1995-01-01), Usami et al.
Foley, James D. et al, "Computer Graphics: Principles and Practices,"Addison-Wesley Publishing Co., 1990, pp. 258-261 and 734-739.
Vaisey, Jacques et al, "Image Compression with Variable Block Size," IEEE Transactions on Signal Processing, Aug. 1992, pp. 2040-2060.

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