Study on image enhancement algorithm applied to passive millimeter-wave imaging based on wavelet transformation

Weapon or goods concealed underneath a person´s clothing can be detected based on the advantages of passive millimeter-wave detection system with concealment, security and penetration through fog, smoke, clothing etc. At present, as images obtained by passive millimeter-wave imaging system are of high noise and low-resolution, the imaging technique based on passive millimeter-wave detecting system is in this paper investigated. An image enhancement algorithm for passive millimeter-wave detecting system is in this paper proposed on the basis of the combination of wavelet transformation and top-hit transformation. The experiment results demonstrate that the algorithm proposed is highly efficient for the passive millimeter-wave images, and the resolving power and definition for detecting image are improved obviously.