intrinsic and extrinsic parameters from 2D Homography

I have a single image . I have (e.g., 15 ) 2d projected points(x[pixel],y[pixel]) and corresponding (X,Y,Z)(m). All points lying on the same plane.

3D poi开发者_如何学Pythonnts are transformed to 2D

Xtrans=X./Z; Ytrans=Y./Z; Ztrans=0;

Now I have computed 2d homography(H3*3=[...];) following the normalised direct linear transformation algorithm given by Hartley and Zisserman.

I want to get intransic and extransic parameters. I could not find any link, code which solve this issue. Could some one guide me. regards