Compositing in the presence of different transparencies

Details Compositing in the presence of different transparencies Compositing in the presence of different transparencies

2006-11-14

2006-11-14

Bella, Matthew C. (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

Reexamination Certificate

active

07136075

ABSTRACT:
Methods and apparatus, including computer program products, for blending in the presence of different transparencies. In one aspect, the invention provides a computer implemented method for blending a first graphic element and a second graphic element in accordance with a transfer mode T, the first graphic element having a color A and an alpha a, the second graphic element having a color B and an alpha b. The method includes: calculating a resulting alpha as lerp(a, b, q), lerp being a linear interpolation function and q being a pseudo-opacity that varies between 1 and 0, inclusive; calculating a blended color as T(A, B, q); calculating an intermediate color as interpolate_color(A, blended color, min(b/resulting alpha, 1)), interpolate_color being a continuous function that interpolates its input colors and min being a function that selects the smaller of its input values; and calculating a result color as interpolate_color(B, intermediate color, min(a/resulting alpha, 1)).

REFERENCES:
patent: 5974198 (1999-10-01), Hamburg et al.
patent: 6028583 (2000-02-01), Hamburg
patent: 6185342 (2001-02-01), Hamburg et al.
patent: 6269196 (2001-07-01), Hamburg
patent: 6396959 (2002-05-01), Hamburg
patent: 6421460 (2002-07-01), Hamburg
patent: 6803923 (2004-10-01), Hamburg
patent: 6825852 (2004-11-01), Hamburg
patent: 2006/0001679 (2006-01-01), Hamburg
Hamburg et al., “Combining Raster and Vector Data in the Presence of Transparency”, U.S. Appl. No. 10/098,328, filed Mar. 15, 2002, 32 pp.

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