| 摘要 |
An S/N ratio is improved and flicker noises and mosquito noises are suppressed while deterioration of a resolution is suppressed. A three-dimensional cyclical digital filter (16) is interposed between a MPEG video decoder (12) and a video DAC. In accordance with a luminance input signal Yu from the MPEG video decoder (12), Yv is calculated from the following equation.Yv=Ft-Kx(Ft-F(t-1))where K is a value in the range of 0</=K<1, Ft is a present Yu input value, and F(t-1) is a one-frame preceding Yv.
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