"Sobel (3x3x3 -- 2sets -- z -90)	max_abs"
3 2 1
3
-1	0 	-1	0
	0 	-2	0
	0 	-1	0

0	2	0	-2
	4	0	-4
	2	0	-2

1	0 	1	0
	0 	2	0
	0 	1	0
3
-1	 0	 0	 0
	-1	-2	-1
	 0	 0	 0

0	 2	 4	 2
	 0	 0	 0
	-2	-4	-2

1	0	0	0
	1	2	1
	0	0	0
