Method and apparatus for encoding and decoding video signals
First Claim
1. A method for encoding and decoding an interlaced video signal, comprising the steps of:
- encoding said interlaced video signal, said encoding including;
separating said interlaced video signal into frequency bands to obtain a high frequency band and at least one low frequency band;
spatially and temporally decimating said at least one low frequency band, said spatial decimation comprising diagonal decimation and said temporal decimation comprising omitting every other field of said at least one low frequency band;
scan converting said high frequency band to obtain a progressively scanned signal, and spatially and temporally decimating said high frequency band progressively scanned signal; and
decoding the encoded signals, said decoding including;
temporally interpolating said at least one low frequency band;
spatially post-filtering said high frequency band; and
combining said bands.
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Abstract
A method is set forth for encoding and decoding a video signal, including the following steps: encoding the signal, the encoding including separating the signal into a plurality of spatial frequency bands at different frame rates, and temporally pre-filtering at least one of the bands with a pre-filtering circuit; and decoding the encoded signal, the decoding preferably including temporally post-filtering the at least one band, and combining the bands. In a preferred embodiment temporal pre-filtering is low-pass temporal filtering with a filter cut-off in the range 1.25 to 1.75 times the temporal Nyquist limit for the frame rate of the at least one band. The temporal post-filtering is preferably low pass temporal filtering with a cut-off near the Nyquist limit.
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Citations
10 Claims
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1. A method for encoding and decoding an interlaced video signal, comprising the steps of:
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encoding said interlaced video signal, said encoding including;
separating said interlaced video signal into frequency bands to obtain a high frequency band and at least one low frequency band;
spatially and temporally decimating said at least one low frequency band, said spatial decimation comprising diagonal decimation and said temporal decimation comprising omitting every other field of said at least one low frequency band;
scan converting said high frequency band to obtain a progressively scanned signal, and spatially and temporally decimating said high frequency band progressively scanned signal; anddecoding the encoded signals, said decoding including;
temporally interpolating said at least one low frequency band;
spatially post-filtering said high frequency band; and
combining said bands. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for encoding and decoding an interlaced video signal, comprising:
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an encoder for encoding said interlaced video signal, said encoder including;
means for separating said interlaced video signal into frequency bands to obtain a high frequency band and at least one low frequency band;
means for spatially and temporally decimating said at least one low frequency band, said spatial decimation comprising diagonal decimation and said temporal decimation comprising omitting every other field of said at least one low frequency band;
means for scan converting said high frequency band to obtain a progressively scanned signal, and means for spatially and temporally decimating said high frequency band progressively scanned signal; anda decoder for decoding the encoded signals, said decoder including;
means for temporally interpolating said at least one low frequency band;
means for spatially post-filtering said high frequency band; and
means for combining said bands. - View Dependent Claims (9, 10)
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Specification