Influence of surface scattering of complicated object on holographic interferogram visibility and its process technique

In general,the surface scattering will influence on the visibility of the holographic interferogram.Some times,the influence is so serious that it is almost not possible to recognize the object displayed in interferogram.As well as a complicated object,the visibility of the holographic interferograms of the printed circuit board have be getting lower by the scattering of the surface and solder joints.This paper presented a fringe detection method in a slide windows to reconstruct the interferogram fringe.With the method,it is possible correctly to decide the location of the solder joints.