Standards conversion of digital video signals
First Claim
1. A method of converting an input digital video signal to an output digital video signal wherein the input and output signals have different frame rates and different numbers of pixel lines per frame, the method comprising the steps of:
- forming a first series of progressive scan format frames from the input signal;
temporally interpolating selected ones of said progressive scan format frames using temporally offset motion vectors and pixel weights to provide the difference in frame rate, said pixel weights for each of said progressive scan format frames being different than the temporal offsets for said each of said progressive scan format frames, thereby forming a second series of frames; and
performing vertical spatial interpolation so as to provide the difference in the number of pixel lines per frame.
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Abstract
An input digital video signal is converted to an output digital video signal having a different frame rate and a different number of pixel lines per frame. A first series of progressive scan format frames is formed from the input signal. Then a second series of frames is formed from the first series of frames using motion compensated temporal interpolation between successive frames of the first series in producing at least some of the frames of the second series so as to provide the difference in frame rate. Before or after the second series of frames is formed, vertical spatial interpolation is performed so as to provide the difference in the number of pixel lines per frame.
77 Citations
17 Claims
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1. A method of converting an input digital video signal to an output digital video signal wherein the input and output signals have different frame rates and different numbers of pixel lines per frame, the method comprising the steps of:
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forming a first series of progressive scan format frames from the input signal; temporally interpolating selected ones of said progressive scan format frames using temporally offset motion vectors and pixel weights to provide the difference in frame rate, said pixel weights for each of said progressive scan format frames being different than the temporal offsets for said each of said progressive scan format frames, thereby forming a second series of frames; and performing vertical spatial interpolation so as to provide the difference in the number of pixel lines per frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A digital video signal conversion apparatus, comprising:
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a digital video signal reproducing apparatus for providing a source digital video signal having a first frame rate and a first number of pixel lines per frame; a digital video signal recording apparatus for recording a supplied digital video signal having a second frame rate different to said first frame rate and a second number of pixel lines per frame different to said first number; means for forming a first series of progressive scan format frames from said source digital video signal; means for temporally interpolating selected ones of said progressive scan format frames using temporally offset motion vectors and pixel weights to provide the difference in frame rate, said pixel weights for each of said progressive scan format frames being different than the temporal offsets for said each of said progressive scan format frames, thereby forming a second series of frames; and means for performing vertical spatial interpolation so as to provide the difference in the number of pixel lines per frame between the source digital video signal and the supplied digital video signal.
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Specification