23 March 1995 Interpolating discrete cosine transform (DCT) representation of digital video over time
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Abstract
Changing video frame rate may require adding new frames. This can be done by interpolating the given frames over time. We describe a very fast algorithm for time interpolation of DCT encoded video. Given a sequence of DCT encoded frames, the algorithm produces the interpolated sequence of DCT encoded frames without computing DCT or inverse DCT. The idea is to exploit a simple shift property of DCT coefficients that holds for frame triplets. It is somewhat analogous to the shift property of Fourier coefficients that holds for frame pairs.
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Haim Schweitzer, Yanjun Zhang, "Interpolating discrete cosine transform (DCT) representation of digital video over time", Proc. SPIE 2421, Image and Video Processing III, (23 March 1995); doi: 10.1117/12.205478; https://doi.org/10.1117/12.205478
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