Motion detection between even and odd fields within 2:1 interlac

Details Motion detection between even and odd fields within 2:1 interlac Motion detection between even and odd fields within 2:1 interlac

1992-05-05

1994-03-01

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348447, H04N 713

Patent

active

052912809

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.

REFERENCES:
patent: 4768092 (1988-08-01), Ishikawa
patent: 4976271 (1990-10-01), Campbell
patent: 4982280 (1991-01-01), Lyon

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