Motion detection between even and odd fields within 2:1 interlaced television standard
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United States of America Patent
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Mar 1, 1994
Grant Date -
N/A
app pub date -
May 5, 1992
filing date -
May 5, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A motion detector generates a field motion detection signal from information contained in adjacent fields of a two-to-one interlaced format video signal. The motion detector comprises an input for receiving the video signal from a source, a first delay for delaying the video signal at the input by one field period less one half of one scanning line period and for providing a first delayed output, a second delay for delaying the video signal at the input by one field period plus one half of one scanning line period and for providing a second delayed output, a first subtraction circuit for subtracting the first delayed output from the video signal to provide a first difference, a second subtraction circuit for subtracting the second delayed output from the video signal to provide a second difference, and a comparison circuit for comparing the first difference with the second difference and for putting out a selected one thereof having a lesser absolute magnitude as the field motion detection signal. A film mode sequence pattern interruption detector using the motion detector is also disclosed.
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