3D image merging technique is a key technique in measuring large scale free form surface. Based on image-control-point-restrain theory

the paper presents a new method of 3D image merging technology. In this method

a pseudo-random space code is first projected on a large object surface

and the images of the object are taken from different angle of views. By matching the window interest points on the overlapping region

the coordinate transformation matrix was obtained and 3D measurement of large- scale free-form surface was realized. Experiment result shows that by this new method of space code image merging technology

large-scale 3D shape can be successfully measured