Sparse orthogonal adjustments around DCT-2-like transforms approximate DST-7 and DCT-8 closely enough that VVC coding efficiency is nearly unchanged while complexity drops by up to roughly 5x.
Since the first approach has computations similar to bi- orthogonal filters, band matrices with at most K non-zero row elements are referred as K-tap adjustments
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Low-Complexity Transform Adjustments For Video Coding
Sparse orthogonal adjustments around DCT-2-like transforms approximate DST-7 and DCT-8 closely enough that VVC coding efficiency is nearly unchanged while complexity drops by up to roughly 5x.