Five field motion detector for a TV scan line doubler

Abstract

A pixel interpolation system for developing progressive line scan video from two interlaced fields of video. An intrafield pixel value is determined by averaging the pixel in the line above and the line below the desired pixel. A motion value is determined by averaging the pixels in the line above and the line below the desired pixel in corresponding fields one frame before and one frame after the desired pixel, subtracting the intrafield pixel value therefrom and comparing these values with the difference of the pixels in the same spatial relationship as the desired pixel, but one field earlier and one field later. The motion value is taken as the largest of the individual values that are determined. An interfield pixel value is determined by comparing the intrafield pixel value with the corresponding pixels in the previous and subsequent frames. The motion value is used to proportion the intrafield and interfield pixel values to generate the desired pixel. A one field delay is introduced before using the interpolated pixel to check for a scene change.

Dependencies are inferred from the claim text.