| 摘要 |
A special effect apparatus which is capable of producing a special effect image in which a speed of image transformation is changed as a function of location between a plurality of predetermined knots of the image. The special effect apparatus includes a read address generating circuit for generating a read-out address to read a stored digital video signal out of a video memory. The read address generating circuit includes a coefficient calculator for calculating coefficients defining a function of a tracing curve, which linearly connects the predetermined knots, a transition distance calculator for calculating a transition distance between the predetermined knots during a transition time, and an interpolated parameter calculator responsive to the calculated coefficients and the calculated transition distance, for calculating an interpolated parameter, based on parameters defined at the predetermined knots, such that the speed of image transformation between the knots varies in accordance with location between the predetermined knots, whereby the read address generator generates a read-out address in accordance with the interpolated parameter.
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