Patent ID: 11930214
Assignee: TENCENT AMERICA LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. An apparatus for decoding compressed video or image data, the apparatus comprising:
at least one memory configured to store computer program code; and
at least one processor configured to access the at least one memory and operate according to the computer program code, the computer program code comprising:
receiving configured to cause the at least one processor to receive a video bitstream comprising a compressed data block, wherein a discrete sine transform (DST) is to be applied as a transform core matrix to the compressed data block;
determining configured to cause the at least one processor to determine whether to use a first transform core matrix that is a 64-point, 8-bit primary transform core matrix constructed using a set of integers that include: {bf, bg, bh, bi, bj, bk, bl, bm, bn, bo, bp, bq, br, bs, bt, bu, by, bw, bx, by, bz} and {ca, cb, cc, cd, ce, cf, cg, ch, ci, cj and ck}, wherein {bf, bg, bh, bi, bj, bk, bl, bm, bn, bo, bp, bq, br, bs, bt, bu, by, bw, bx, by, bz} and {ca, cb, cc, cd, ce, cf, cg, ch, ci, cj, ck} are equal to {91, 90, 90, 90, 88, 87, 86, 84, 83, 81, 79, 77, 73, 71, 69, 65} and {62, 59, 56, 52, 48, 44, 41, 37, 33, 28, 24, 20, 15, 11, 7, 2} respectively;
deriving configured to cause the at least one processor to derive the 64-point, 8-bit primary transform core matrix by reordering the set integers and determining their corresponding signs; and
reconstructing configured to cause the at least one processor to reconstruct the compressed data block using the derived 64-point 8-bit primary transform core matrix.