Patent ID: 7274376
Filing Date: 2007-09-25
Classification: H04N

Abstract:
1. 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 the picture signals read out from said frame buffer, said special effect device comprising: address signal generating means for generating a readout address signal of said picture signals stored in said frame buffer so that the picture signals will be output to each of a plurality of corresponding triangular areas of a preset size fractionated from said picture signals stored in said frame buffer, wherein said address signal generating means generates the readout address signal of said picture signals stored in said frame buffer so that the totality of picture signals output in each triangular area will be preset picture signals of the same sort from one of the triangular areas to another; and wherein, with the bottom side and the height of a triangle fractionated from said picture signals being Wy and Wx, respectively, said address signal generating means generates a readout address signal (X0, Y0) for reading out picture signals in an area of said triangle in case the center of said picture signals is at the point of origin of a rectangular coordinate system by the equation (4-2): which satisfies the equations (4-3), (4-4), (4-5) and (4-6): where w w [] is the Gaussian symbol; and wherein said address signal generating means generates, by the equation (4-7): readout signal generating means for generating a readout signal (X,Y) in case the position of the point of origin in the rectangular coordinate system of said picture signals is (cx, cy).