id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
581	Typos of filter coefficients array for CCLM	chiaming		"In ""8.4.5.2.13 Specification of INTRA_LT_CCLM, INTRA_L_CCLM and INTRA_T_CCLM intra prediction mode"", filter coefficients arrays are defined as:

 – The one-dimensional filter coefficients array F1 and F2, and the 2-dimensional filter coefficients arrays F3 and F4 are specified as follows.
  F1[ i ] with i = 0..2				(8-160)
  F2[ 0 ] = 1, F2[ 1 ] = 2, F2[ 2 ] = 1	(8 161)
  F3[ i ][ j ] = F4[ i ][ j ] = 0, with i = 0..2, j = 0..2	(8-162)
 – If both SubWidthC and SubHeightC are equal to 2, the following applies:
  F1[ 0 ] = 1, F1[ 1 ] = 1				(8-163)
  F3[ 0 ][ 1 ] = 1, F3[ 1 ][ 1 ] = 4, F2[ 2 ][ 1 ] = 1, F3[ 1 ][ 0 ] = 1, F3[ 1 ][ 2 ] = 1	(8-164)
  F4[ 0 ][ 1 ]  = 1, F4[ 1 ][ 1 ] = 2, F4[ 2 ][ 1 ] = 1	(8-165)
  F4[ 0 ][ 2 ] = 1,  F4[ 1 ][ 2 ] = 2, F4[ 2 ][ 2 ] = 1	(8-166)
 – Otherwise, the following applies:
  F1[ 0 ] = 2, F1[ 1 ] = 0				(8-167)
  F3[ 1 ][ 1 ] = 8					(8-168)
  F4[ 0 ][ 1 ] = 2, F4[ 1 ][ 1 ] = 4, F4[ 2 ][ 1 ] = 2,	(8-169)

However, F1[ 2 ] is nowhere used in the current spec, and there is also a typo for F3[ 2 ][ 1 ].
The issue could be fixed by:

 – The one-dimensional filter coefficients array F1 and F2, and the 2-dimensional filter coefficients arrays F3 and F4 are specified as follows.
  [[span(style=color: #FF0000, F1[ 0 ] = 2, F1[ 1 ] = 0				(8-160))]]
  F2[ 0 ] = 1, F2[ 1 ] = 2, F2[ 2 ] = 1			(8-161)
  F3[ i ][ j ] = F4[ i ][ j ] = 0, with i = 0..2, j = 0..2	(8-162)
 – If both SubWidthC and SubHeightC are equal to 2, the following applies:
  F1[ 0 ] = 1, F1[ 1 ] = 1				(8-163)
  F3[ 0 ][ 1 ] = 1, F3[ 1 ][ 1 ] = 4, F[[span(style=color: #FF0000, 3)]][ 2 ][ 1 ] = 1, F3[ 1 ][ 0 ] = 1, F3[ 1 ][ 2 ] = 1	(8-164)
  F4[ 0 ][ 1 ]  = 1, F4[ 1 ][ 1 ] = 2, F4[ 2 ][ 1 ] = 1	(8-165)
  F4[ 0 ][ 2 ] = 1,  F4[ 1 ][ 2 ] = 2, F4[ 2 ][ 2 ] = 1	(8-166)
 – Otherwise, the following applies:
  ~~[[span(style=color: #FF0000, F1[ 0 ] = 2, F1[ 1 ] = 0				(8-167))]]~~
  F3[ 1 ][ 1 ] = 8					(8-168)
  F4[ 0 ][ 1 ] = 2, F4[ 1 ][ 1 ] = 4, F4[ 2 ][ 1 ] = 2,	(8-169)
"	defect	closed	minor		spec	VVC D7 vB	fixed		ksuehring bbross XiangLi fbossen jvet@…