Method and apparatus for modifying a cutout image for compositin

Details Method and apparatus for modifying a cutout image for compositin Method and apparatus for modifying a cutout image for compositin

1997-07-03

1999-11-09

Nguyen, Phu K.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

G06T 1500

Patent

active

059823810

ABSTRACT:
A method and apparatus for modifying a sprite containing a cutout feature for compositing with a background image modifies colors of pixels in the sprite according to their distances from the edge of the cutout feature to achieve desired visual effects such as edge softening. A distance mask for the sprite is generated which stores distance values representing distances of corresponding pixels in the sprite from the edge of the cutout feature. The distance mask can be efficiently generated by a chamfering technique. A clamping function is applied to the distance mask to determine scaling values for the respective pixels in the sprite. A modified sprite is constructed from the original sprite by modifying the colors of the pixels of the input sprite according to their respective scaling values. The modified sprite is then composited with the backgorund image to form a composite image.

REFERENCES:
patent: 5808617 (1998-09-01), Kenworthy et al.
patent: 5867166 (1999-02-01), Myhrvold et al.
patent: 5870097 (1999-02-01), Snyder et al.
Parametric Correspondence and Chamfer Matching: Two New Techniques for Image Matching: H.G Barrow, J.M. Tenebaum, R.C. Bolles, H.C. Wolf; Vision-7 pp. 659-663.
Distance Functions on Digital Pictures; A. Rosenfeld and J.L. Pfaltz; Patent Recognition 1968 vol. 1 pp. 33-61.

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