ANALYSIS OF SHEAROGRAM RECONSTRUCTION

The high-pass Fourier filtering technique with an opaque stopper is co mmonly used for the reconstruction of shearograms. We believe that no analysis of this technique as applied to the shearogram reconstruction has been described. We present here a theoretical analysis of this re construction system taking into account the stopper that blocks the lo w-frequency region in the Fourier transform plane. The results show th at the light-intensity distribution after reconstruction is different from that of the original shearogram. High fringe visibility is obtain ed with high-pass filtering.