Patent ID: 7184060

Claim:
A special effect device in which picture signals are read out from a frame buffer based on an address signal to impart a desired special effect to a picture corresponding to the picture signals read out from said frame buffer, said special effect device comprising: address signal generating means for generating a readout address signal for said picture signals stored in said frame buffer so that, by rupturing a picture portion within an area at an optional position of said picture, defined by a circle having a radius of an optional size, with the center of the circle as a rupturing point, a folded figure will be obtained which has the circumference of said circle as a topological boundary, wherein the shape of the folded figure is prescribed by a function F(θ), wherein the function F(θ) is represented by the equation (1-1): F ⁡ ( θ ) = F ′ ⁡ ( t ) = { 4 ⁢ ( y p - y q ) ⁢ ( t - 0.5 ) 2 + y q ( 0.0 ≤ t < 0.5 ) 4 ⁢ ( y r - y q ) ⁢ ( t - 0.5 ) 2 + y q ( 0.5 ≤ t < 1.0 ) ( 1 ⁢ - ⁢ 1 ) where t=θ×1Plickle (mod2π); which satisfies the equation (1-2): y p , y r , =(16.0+(fix AmpMax+fix Random+Rnd)+4.0)/16.0 y q =(4.5+(fixAmpMin+fix Random+Rnd)+1.75)/16.0 (1-2) 0.5 ≦y r ≦2.0 1.0/16.0≦ y q ≦0.5; where Rnd is a random number between 0.0 and 1.0.