Hardware-Friendly Multiple Transform Selection Module for the VVC Standard

The H.266/versatile video coding (VVC) standard is the most recent ITU/ISO finalized in July 2020. VVC includes several new tools at different levels of scheme. These enable a significant bitrate saving up to 50% for same subjective quality than its predecessor H.265/high efficiency (HEVC). Among these tools, we can cite multiple transform selection (MTS) which selects encoder horizontal and vertical transforms among three trigonometrical transforms, including discrete cosine (DCT) type II, sine (DST) VII DCT VIII. Unlike DCT-II, DST-VII does not have efficient fast algorithmic implementation. Moreover, MTS increases memory usage required store coefficients transforms. Consequently, this paper targets an approximation kernel based on DCT-II adjustment stage. modeled as integer optimization problem jointly minimizing error orthogonality approximate under sparsity constraint sparse nonlinear optimizer (SNOPT) solver with additional relaxation used solve find best band matrices sizes. DCT-VIII then computed from pre/post processing operations involving only sign changes input/output reordering. proposed provides reduction both arithmetic usage. it preserves gain brought by reference software. advantages make our solution suitable energy-efficient hardware H.266//VVC encoders decoders deployed consumer electronic devices.