Television – Format conversion – Line doublers type
Reexamination Certificate
1999-02-24
2001-04-17
Kostak, Victor R. (Department: 2611)
Television
Format conversion
Line doublers type
C348S416100, C348S431100
Reexamination Certificate
active
06219103
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to highly efficient coding of video data to digital signals with a small amount of codes for efficient data transfer, storage and displaying. Particularly, this invention relates to motion-compensated coding of video data.
Moving picture highly efficient coding in MPEG standards includes motion-compensated prediction. Motion-compensated prediction of interlaced video signals produces relatively many predictive errors due to many spatial aliasing noise components generated in each field of the interlaced videos.
Compared to interlaced video signals, motion-compensated prediction of progressive video signals produces a small amount of predictive errors because of spatial aliasing noise components included in the progressive signals, that are fewer than those in interlaced video signals.
Encoding after interlaced video signals have once been converted into progressive signals thus produces an amount of codes smaller than those produced by encoding of interlaced video signals themselves.
Encoding after video format conversion (interlaced to progressive signals) requires motion vector prediction using video signals to be encoded. Video signals produced by video format conversion exhibits a slight displacement between the original scanning lines and scanning lines produced by interpolation, and contamination of scanning lines produced due to erroneous interpolation, etc. The video signals produced by video format conversion have no problem on subjective picture quality, however, exhibits difficulty in motion vector detection.
SUMMARY OF THE INVENTION
A purpose of the present invention is to provide an apparatus and a method of motion-compensated predictive coding of video signals that have been obtained by video format conversion of input video signals, achieving high coding efficiency and picture quality.
The present invention provides a coding apparatus. The coding apparatus has a first converter to convert an input first video signal into a second video signal to be encoded, the number of effective scanning lines of the second video signal being different from the number of effective scanning lines of the first video signal; and a second converter to convert the first video signal into a third video signal for which spatial aliasing noise is suppressed. The coding apparatus also includes a motion estimator to estimate motion of pictures carried by the third video signal to obtain first motion vector data; and a vector searcher to search motion of the second video signal using the first motion vector data to obtain second motion vector data. The coding apparatus further includes an encoder to encode the second video signal by motion-compensated prediction using the second motion vector data.
Furthermore, the present invention provides a coding method. An input first video signal is converted into a second video signal to be encoded, the number of effective scanning lines of the second video signal being different from the number of effective scanning lines of the first video signal. The first video signal is converted into a third video signal for which spatial aliasing noise is suppressed. The motion of each picture carried by the third video signal is estimated to obtain first motion vector data. The motion of the second video signal is searched using the first motion vector data to obtain second motion vector data. The second video signal is encoded by motion-compensated prediction using the second motion vector data.
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patent: 10-126786 (1998-05-01), None
Jacobsob, Price, Holman & Stern, PLLC
Kostak Victor R.
Victor Company of Japan Ltd.
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