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

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

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

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

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