Video signal processing apparatus for performing magnification processing

A video signal processing apparatus comprising,

• A/D converter means for converting an analog video signal to a digital video signal,
• three dimensional scanning line interpolating means for interpolating scanning lines in three dimensions from said digital video signal and for generating an interpolating video signal,
• magnification processing means, including a) a first field memory for storing said digital video signal and b), a second field memory for storing said interpolating video signal, for magnifying each of said digital video signal stored in said first field memory and said interpolating video signal stored in said second field memory to generate a magnified digital video signal and a magnified interpolating video signal respectively,
• a controller for controlling the magnification processing means when the magnification processing means magnifies each of said digital video signal stored in said first field memory and said interpolating video signal stored in said second field memory to generate said magnified digital video signal and said magnified interpolating video signal respectively,
• switching signal generating means for generating a switching signal according to a vertical magnifying power,
• first switching means for switching between said magnified digital video signal and said magnified interpolating video signal according to said switching signal to generate a first switching means output signal which is one of said magnified digital video signal and said magnified interpolating video signal,
• second switching means for switching between said magnified digital video signal and said magnified interpolating video signal according to said switching signal from said switching signal generating means and for outputting a second switching means output signal which is the other of said magnified digital video signal and said magnified interpolating video signal,
• subtracting means for subtracting said second switching means output signal from said first switching means output signal to generate a subtracting means output signal,
• coefficient generating means for generating a coefficient signal which is a function of said vertical magnifying power,
• multiplying means for multiplying the subtracting means output signal and the coefficient signal to generate a multiplying means output signal, and
• adding means for adding the first switching means output signal and the multiplying means output signal to generate a processed video signal.