Movement detection circuit of a video signal used in a television receiver

DETAILED DESCRIPTION It is an object of the present invention to provide a movement detection circuit which eliminates the problems encountered in the prior art circuits and which can correctly detect the movement of an image in which only color changes or which moves fast.
The movement detection circuit of the present invention comprises a first movement detection circuit for detecting movement information of a luminance signal and a second movement detection circuit for detecting movement information of a chrominance signal.
The first movement detection circuit detects the movement information of the luminance signal based on two signals spaced by one frame period.
The second movement detection circuit detects the movement information of at least the chrominance signal based on two signals spaced by two frame periods.
Those two movement information signals are combined in an adder circuit.
Accordingly, the movement information of the image is correctly detected.
In the movement detection circuit of the present invention, the movement information produced by the adder circuit is supplied to a time space filter, which uses the movement information of one pixel signal as well as the movement information of the time-spatially surrounding pixels, that is, past vertically and horizontally adjacent pixels.
In this manner, misdetection for a fast moving object is prevented.