Method and apparatus for interpolating scanning line of TV signal in TV

An apparatus for interpolating a scanning line of a video signal, comprising:

• scanning line interpolating means for discriminating at least vertical and diagonal variations from among possible vertical, horizontal and diagonal variations of an input video signal for obtaining at least vertical and diagonal component signals therefrom, for comparing said discriminated variations for determining among said component signals a component signal having a smallest variation and generating at least one weight control signal in accordance with said comparison, for IIR-filtering said weight control signal and generating at least one weight in accordance therewith and for generating a complement of said weight, for multiplying an averaged value of one of said component signals by said weight and multiplying an averaged value of the one of said component signals determined as having the smallest variation by the complement to said weight, and for adding the multiplied signals and outputting the sum as an interpolation signal;
• first time base compressing means for compressing a time base of said interpolation signal;
• second time base compressing means for compressing a time base of said input video signal;
• and
• means for selecting said time base-compressed input video signal with respect to a scanning line of said input video signal and for selecting said time base-compressed interpolation signal with respect to a scanning line to be interpolated.