US 9,813,737 B2
Transposing a block of transform coefficients, based upon an intra-prediction mode
Jing Wang, Waterloo (CA); Xiaofeng Wang, Markham (CA); Dake He, Waterloo (CA); and Tianying Ji, Toronto (CA)
Assigned to BlackBerry Limited, Waterloo, Ontario (CA)
Filed by BLACKBERRY LIMITED, Waterloo (CA)
Filed on Sep. 19, 2013, as Appl. No. 14/31,436.
Prior Publication US 2015/0078445 A1, Mar. 19, 2015
Int. Cl. H04N 19/61 (2014.01); H04N 19/13 (2014.01); H04N 19/157 (2014.01); H04N 19/91 (2014.01)
CPC H04N 19/61 (2014.11) [H04N 19/13 (2014.11); H04N 19/157 (2014.11); H04N 19/91 (2014.11)] 19 Claims
OG exemplary drawing
 
1. A method for reconstructing a current block of residual data, using a video decoder, from an encoded block of residual data in a bitstream of encoded video, the method comprising:
determining whether a mode used in generating the encoded block is an intra-prediction mode in a predetermined class;
entropy decoding the encoded block to obtain an entropy-decoded block; and
responsive to determining that the intra-prediction mode is in the predetermined class, transposing at least a portion of the entropy-decoded block to obtain a transposed block, and not performing said transposing if the mode is not in the predetermined class,
wherein the predetermined class is a horizontal class.