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Motion detection between even and odd fields within 2:1 interlaced television standard
| Details |
Inventors: Faroudja, Yves C.; Xu, Dong; Swartz, Peter;
Assignee:
Primary Examiner: Chin; Tommy P.
Assistant Examiner: Tung; Bryan S.
Attorney, Agent or Firm: Gallagher; Thomas A., Lathrop; David N.
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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DETAILED DESCRIPTION A general object of the present invention is to provide a method and apparatus for detecting images in motion between even and odd fields within a two-to-one interlaced television signal in a manner overcoming limitations and drawbacks of the prior art.
A more specific object of the invention is to provide a field motion detector for use within a two-to-one interlaced temporal video signal stream in conjunction with a frame motion detector operating upon the same signal stream, in order to identify motion on a field by field basis.
A further specific object of the present invention is to provide a pattern interruption detector for controlling a pattern recognition circuit within a temporal video signal stream.
As one facet of the present invention, 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 or field 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 or line delay for delaying the video signal at the input by one field period plus one half of one scanning line 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.
As one aspect of this facet of the invention, a first low pass filter, a first sign removal circuit and a first threshold circuit are in a path between the first subtraction circuit and the comparison circuit, and a second low pass filter circuit, a second sign removal circuit and a second threshold circuit are in a path between the second subtraction circuit and the comparison circuit
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TV Signal 
