Method and apparatus for efficiently determining a frame motion vector in a video encoder
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United States of America Patent
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Nov 11, 1997
Grant Date -
N/A
app pub date -
Jul 13, 1995
filing date -
Jul 13, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of implementing a fast video encoder by approximating a frame motion vector is introduced. MPEG-2 encoding uses both field and frame vectors in the encoding process. To implement an encoder in an efficient manner, an approximated motion vector created from two field motion vectors is used. The frame motion vector may be determined using the two field motion vectors alone, or by using the two field motion vectors in conjunction with their respective absolute error values. By using the disclosed methods, a motion estimation part for generating frame motion vector is not necessary. Only two field motion estimation parts are required to determine the field motion vectors, the frame motion vector is then approximated using the two field motion vectors. The cost and complexity of a digital video encoder system is thereby reduced.
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