3d reconstruction from single 2d image ?

hello mathworkers can someone help me i have a .ppm image and i want to create 3d mesh (get x, y, z values)

Answer 1

[Walter Roberson]

im = imread('cameraman.tif');
[X,Y] = ndgrid(1:size(im,2), 1:size(im,1));
mesh(X,Y,im)
view([70 69])

[Marwa Jabberi]

thanks for answering but i ant to get z coordinate from 2d image (x,y) from 2d image to 3d mesh