id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
998	Typos in the derivation of neighbouring luma samples of CCLM	wangyang.cs		"Two typos exist in JVET-Q2001-vE:
1. When availT is equal to FALSE, numSampT is equal to 0. When availL is equal to FALSE, numSampL is equal to 0.
2. 2-tap filter in CCLM will never be used.

Suggest changes in JVET-Q2001-vE as follows:
== 8.4.5.2.13 Specification of INTRA_LT_CCLM, INTRA_L_CCLM and INTRA_T_CCLM intra prediction mode
2.	The neighbouring luma samples pY[ x ][ y ] are derived as follows:

        –	When numSampL is greater than 0, the neighbouring left luma samples pY[ x ][ y ] with x = −1..− 3, y = 0..SubHeightC * numSampL − 1, are set equal to the reconstructed luma samples prior to the deblocking filter process at the locations ( xTbY + x , yTbY +y ).

        –	When availT is equal to FALSE, the neighbouring top luma samples pY[ x ][ y ] with x = −1..SubWidthC * [ticket:1 numSampT][[span(style=color: #0000FF, nTbW)]] − 1, y = −1..−2, are set equal to the luma samples pY[ x ][ 0 ].

        –	When availL is equal to FALSE, the neighbouring left luma samples pY[ x ][ y ] with x =                         −1..−3, y = −1..SubHeightC * [ticket:1 numSampL][[span(style=color: #0000FF, nTbH)]] − 1, are set equal to the luma samples pY[ 0 ][ y ].
...
 –	The one-dimensional filter coefficients array [ticket:1 F1 and] F2, and the 2-dimensional filter coefficients arrays F3 and F4 are specified as follows.
               [[ticket:1|F1[ 0 ] = 2, F1[ 1 ] = 0				(361)]]
                F2[ 0 ] = 1, F2[ 1 ] = 2, F2[ 2 ] = 1	(362)
                F3[ i ][ j ] = F4[ i ][ j ] = 0, with i = 0..2, j = 0..2	(363)
            –	If both SubWidthC and SubHeightC are equal to 2, the following applies:
                [[ticket:1|F1[ 0 ] = 1, F1[ 1 ] = 1				(364)]]

"	defect	closed	minor		spec	VVC D8 vB	fixed		ksuehring bbross XiangLi fbossen jvet@… jvet@…