Television – Image signal processing circuitry specific to television – Special effects
Patent
1997-04-07
2000-05-30
Hsia, Sherrie
Television
Image signal processing circuitry specific to television
Special effects
348580, 348583, 348590, H04N 974
Patent
active
060696680
ABSTRACT:
A digital video effects system for producing live-action video effects in real time includes an address generator having a pair of 2-D tables for providing x-coordinate and y-coordinate offset values. A third 2-D table contains warp activation factors (activators) which are scaled by a clip and gain processing technique to produce scaled activators. The scaled activators are used to scale the x- and y-offset values which are then combined with the original raster-order addresses to produce frame buffer readout addresses. An output video signal is produced by an inverse mapping of the input frame buffer to the output. The 2-D tables provide control of the image on a pixel-by-pixel basis. The degree of scaling by the clip and gain unit varies with time so that the resulting readout addresses also vary with time. A video effect, therefore, is produced simply by adjusting the scaling of the clip and gain unit. Moreover, a variety of effects can be achieved simply by changing the various 2-D tables.
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George Wolberg, "Digital Image Warping" , published by the IEEE Computer Society Press, 1990, .sctn.7.5, pp. 222-240.
Dresdner Daniel
Woodbury William C.
Woodham, Jr. David J.
Hsia Sherrie
Pinnacle Systems Inc.
Schneck Thomas
Yee George B.F.
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