Patent ID: 11943455
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method comprising:
receiving, by a decoder, a bit stream including:
a transform block including transform coefficients; and
a group significance map including one or more significant coefficient group flags associated with the transform block;

beginning with a last column of the group significance map, determining a first column of the group significance map in which one or more significant coefficient group flags has a first non-zero value;
beginning with a last row of the group significance map, determining a first row of the group significance map in which one or more significant coefficient group flags has a second non-zero value;
selecting, by the decoder, a distribution pattern for the transform block from a plurality of predetermined distribution patterns based on the first column of the group significance map and the first row of the group significance map; and
determining, by the decoder, an output block based on an inverse discrete cosine transformation (IDCT) of the distribution pattern of the transform block.