1. A method for interpolating a video signal having a plurality of present pixels comprising the steps of: calculating an adjusting value based on a pixel data of a central present pixel and pixel data of present pixels around the central present pixel; setting a polarity of adjusting value based on pixel data of a pair of present pixels on both sides of the central present pixel; calculating a right side interpolation component for the central present pixel based on a ½ value of the pixel data of the central present pixel and the adjusting value applied with a polarity; calculating a left side interpolation component for the central present pixel based on a ½ value of the pixel data of the central present pixel and the adjusting value applied with the polarity; and adding the right side interpolation component of a present pixel on the left side of an assumption pixel to be interpolated to the left side interpolation component of another present pixel on the right side of the assumption pixel, thereby obtaining a pixel data for the assumption pixel.