FaSST approximates sparse orthonormal transforms with mode-adaptive Givens rotation sequences to produce low-complexity secondary transforms for AV2 intra residuals that match LFNST rate-distortion performance at 83.67% lower complexity and deliver up to 1.80% BD-rate savings.
Non-separable mode dependent transforms for intra coding in HEVC
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FaSST: Fast Sparsifying Secondary Transform
FaSST approximates sparse orthonormal transforms with mode-adaptive Givens rotation sequences to produce low-complexity secondary transforms for AV2 intra residuals that match LFNST rate-distortion performance at 83.67% lower complexity and deliver up to 1.80% BD-rate savings.