( 7) . : () x, y , , , . - , .
, , , .
. , .
3. : 8
. () .
. - x y :
. .
W=1,
(x,y) = (x, y, 1)
22 , 33, .
W ( h, S, H . .). . .
1. W .
2. , , .
, 3- , , W=1.
-, ( ).
W=0, , . . -, , (, ). ( W=0) - - .
: W=1 = > X, Y, W , : W=0 = > X, Y, 0 .
W=0, , , .
|
|
, . : ( 9)
~ translation ()
T(dx, dy) =
~ shear by x ( x)
shx (shx) =
~ shear by y ( y)
Shy (shy) =
~ scaling ()
S (sx, sy) =
~ rotation ()
R (α) =
3×3, , ( ). detA ≠ 0 , .