JPS6467092A - Movement detecting circuit for video signal - Google Patents

Abstract

PURPOSE:To receive no influence of the still picture component of a chrominance signal and to correctly detect the movement of a prescribed time frequency luminance signal, by making the interframe difference of the output signal of a transversal filter an absolute value, and converting to a movement detecting signal. CONSTITUTION:A means 14 for obtaining the interframe difference of the output signal of the low pass transversal filter constituted by defining the delay of a prescribed line to be a unit delay, a means 18 for making the interframe difference the absolute value and a movement coefficient converting circuit 36 for converting to the movement detecting signal from an interframe difference signal made the absolute value are provided. In a vertical-time frequency area, for instance, in case of an NTSC video signal, when a chrominance signal present in a second and a fourth quadrants is two-dimesionally removed and when the chrominance signal existing in a first and a third quadrants in case of a PAL video signal is removed, the luminance signals existing in the respective quadrants is left. Thereby, at the time of taking the interframe difference signal of a signal, the movement of the luminance signal in the time frequency f=1/2fF(NTSC) or f=1/4fF, 3/4fF(PAL) can be detected.