A system for detecting picture freeze within a video signal wherein a video signal
processing portion for connection to a video signal source comprising digital video
luma samples and digital video clock and timing signals separately detects motion
across the vertical axis of the video picture and across the horizontal axis of
the video picture and wherein a frozen picture indicating portion connected to
the output of the video signal processing portion determines the number of motionless
video picture frames occurring since the last video picture frame in which motion
was detected to indicate picture freeze when the number of motionless video picture
frames reaches a predetermined value. A noise reduction threshold signal is applied
to the video signal processing portion to distinguish motion from background noise
in a video signal.