| 摘要 |
PROBLEM TO BE SOLVED: To provide an interpolation filter in which a difference of frequency characteristics by an interpolation pixel position is small using a 3rd interpolation which makes a circuit size small. SOLUTION: The interpolation filter 101 performs interpolation processing for a video signal. An interpolation function f(x) showing coefficients to be multiplied for pixels in a distance x from a position of an interpolation object is given by the following formula: f<SB>i</SB>(x)=a<SB>i</SB>¾x¾<SP>3</SP>+b<SB>i</SB>¾x¾<SP>2</SP>+c<SB>i</SB>¾x¾+d<SB>i</SB>(x<SB>i</SB>≤¾x¾<x<SB>i+1</SB>) (i=0, 1, ... , n-1, x<SB>0</SB>=0, x<SB>n</SB>=2), f<SB>0</SB>(0)≠1, f<SB>i</SB>(x<SB>i+1</SB>)=f<SB>i+1</SB>(x<SB>i+1</SB>), f<SB>n</SB>(2)=0 f(1+k)+f(k)+f(1-k)+f(2-k)=1 (k is a decimal part of coordinates of the position of the interpolation object). COPYRIGHT: (C)2006,JPO&NCIPI |
