1. A method of developing a progressive scan display by interpolation of pixels of a video signal having two interlaced fields of line video comprising: making available video pixels of said video signal from successive lines in one field and corresponding lines in fields one frame previous to and one frame subsequent to said one field; determining a motion value from pixels of said video signal in said one field and from pixels in corresponding fields in said one frame previous and said one frame subsequent; determining an intrafield value from pixels in said video signal in said one field; determining an interfield value from pixels in said one field and from pixels in the immediately previous and immediately subsequent fields thereto; and developing an interpolated pixel in said one field by proportioning said intrafield value and said interfield value based upon said motion value.