For conventional imaging methods, the camera lens facing the object is necessary. Because of obstacles, conventional imaging methods in many cases are not get the ideal image of the target object. But in correlation imaging, by setting an appropriate angle, the image is got without the camera lens lying in front of the target object with the diffusing on the obstacles. Under a digital micro- mirror device (DMD) modulation, the reference path is omitted. Also, DMD may also be used to implement the correlation imaging with ordinary light source, such as light emitting diode. It has broad prospects in engineering projects.