PURPOSE: To attain vertical contour emphases at only one line by providing a memory circuit storing a video signal by one field and a differential circuit generating a difference signal from a 1st field signal stored in the memory circuit and a 2nd field signal in pairs with the 1st field signal to the processing circuit.

CONSTITUTION: Suppose that an n-th scanning line signal of a 2nd field is inputted from a signal input terminal 200. In this case, n-th and (n+1)th of a 1st field, that is, two scanning line signals of the 1st field between which the n-th scanning line signal of the 2nd field is inserted are outputted from a memory 202. The two signals are converted into an analog signal, the signal level is halved at half reduction circuits 206, 207 and the result is subtracted from the n-th scanning line signal of the 2nd field being an original signal at a difference circuit 208. The signal obtained as a result is a contour emphasis signal. The signal is regulated into a level in which the resolution and the stability of picture are optimized at a level adjustment circuit 209 and the result is outputted from an output terminal 211.