A parametric hypercube-Givens transform (HyGT) matches KLT secondary-transform coding gain (about 6% bit-rate reduction) while cutting memory by roughly 5-7x.
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Highly Efficient Non-Separable Transforms for Next Generation Video Coding
A parametric hypercube-Givens transform (HyGT) matches KLT secondary-transform coding gain (about 6% bit-rate reduction) while cutting memory by roughly 5-7x.