(z+1/z)/2.
f , (x, y)=f(u, v) F x+i*y=F(u+i*v).
. ; .
G, G(z)=(z+1/z)/2, , . , , ( ) . (. pp. 340-341 in Strang, Gilbert, Introduction to Applied Mathematics, Wellesley-Cambridge Press, Wellesley, MA, 1986.)
G . , .
g (u, v)=g(x, y) w=G(z), w =u+i*v z=x+i*y.
, 300x500 .
A=imread('peppers.png');A=A(31:330, 1:500,:);figure, imshow(A);title('Original Image');maketform TFORM INVERSE_FCN :
: ipex004.m |
function U=ipex004(X, t) Z=complex(X(:, 1), X(:, 2)); R=abs(Z); W=(Z+1./Z)/2; U(:, 2)=imag(W); U(:, 1)=real(W); |
. , . , . , , .
- . .