In this paper, the information characteristics of the Wiener spectrum of a double exposure specklegram have been discussed. As an example, the general expressions of Young' s fringe patterns are obtained. We have analysed the fringe visibility and its dependence on the nature of the deformation and displacement of the specinaen and on theextent of laser beam illuminated area on the specklegrams. The maximum number of visible fringes has been derived. Finally, diffraction halo brightness and it dependence on the extent of laser beam illuminated area on the specklegrams. The maximum number of visible fringes has been derived. Finally, diffraction halo brightness and it dependence on the contrast of speckles have been given.