Only one of these images formed is the focused image,which does not show fringe effect and has more concentrated optical intensity and better measurement resolution.

Millimeter wave focal plane array imaging systems and microwave holographic imaging systems for concealed weapon detection were introduced.

To use mid-variable skillfully, the mapping relation between gray gradient of CCD image and gradient of focused image surface (FIS) has been found, and the gray restricting equation has been changed into solvable monadic equation to find depth information on the FIS.

Focal Plane Imaging is one of the most significant systems in millimeter wave imaging technology, as a result of the facts ,this technology has many advantages, such as real-time imaging, particularly for fast-moving targets, simple structure and easy implementation, it has been widely utilized in anti-terrorism security, scenes of surveillance, military reconnaissance and other fields.