With the characteristics of un-touching

high-automatic and high-speed

we measured 3D shape by digital moiré patterns. And it can measure 3D shape without compensator

auxiliary mirror

hologram and other assistant modules. So it is widely used in measurement of 3D shape. But with the negative effect of grating area and CCD resolution of the camera

it has some problems in large aperture

steep aspheric surface

even off-axis asphere testing. Focus on these problems; this paper established a sub-region stitching measurement of asphere by using the combination of digital moire patterns and digital phase shifting technology. This paper also illustrated the basic theory

and the mathematical implementation procedure. In all

sub-region stitching digital moiré patterns can be considered as another method

which beyond compensation tests to measurement of asphere.